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National Standard for Commercial Vessels

Part C Section

Australian Transport Council

National Standard for Commercial Vessels

PART C DESIGN AND CONSTRUCTION

SECTION 2 WATERTIGHT AND WEATHERTIGHT INTEGRITY

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Part C Section 2

First published: dd/mm/yy

Draft for comment issued--d month year

Endorsed by the Australian Transport Council--dd/mm/yy

© Commonwealth of Australia

This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without the written permission of the Chief Executive Officer, NMSC. Published by The National Marine Safety Committee, PO Box R1871 Royal Exchange, NSW 1225. All inquiries are to be addressed to the Chief Executive Officer, NMSC Secretariat. ISBN XXXXXXXXX

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Part C Section

FOREWORD

This Section of the National Standard for Commercial Vessels was prepared as part of the review of the Uniform Shipping Laws (USL) Code. It replaces Section 5C, 5D and 7 of the USL Code. In drafting this Section, consideration was given to a number of factors including the following: a) Technological developments that have occurred in the design of vessels engaged in domestic operations in Australia. b) Problems of application or interpretation of the USL Code. c) The introduction of performance-based standards as an alternative to prescriptive standards. d) The amendment of the International Convention on Load Lines by the adoption of the 1988 Protocol as published in IMO Resolution MSC.143(77). e) The development of the IMO Code of Safety for High Speed Craft applicable to vessels engaged in international operations. This Section of the National Standard for Commercial Vessels shall be read in conjunction with Part B--General Requirements of the National Standard for Commercial Vessels (NSCV). It should also be read in conjunction with Part A--Safety Obligations. The NMSC Secretariat drafted this Section with the assistance of a reference group comprising representatives from State Marine Safety Authorities, marine industry representatives from various States, and the Australian Maritime Safety Authority (AMSA). As part of the preparation of this Section, the reference group considered responses to an Issues Paper published in August 2008 by the NMSC, prepared for the purpose of inviting comments to the review of safety issues addressed by this Section of the standard. The International Convention on Load Lines, 1966, as amended by the Protocol of 1988, has been used as the basis for the requirements for watertight and weathertight integrity. In particular, the convention's "Conditions of Assignment" in its Chapter II of Annex 1 informs the major portion of this Section of the NSCV. For completeness, approaches and/or text of other parts of the International Convention on Load Lines have been included. Other requirements have been taken from SOLAS Chapter II-1 "Construction - Structure, subdivision and stability, machinery and electrical installations" (The Safety Convention, as amended up to the adoption of IMO Resolution MSC.216 (82) as indicated in Marine Orders Part 12 Issue 2). In determining any requirements for watertight and weathertight integrity that are relaxed by the provision of excesses of buoyancy or freeboard, approaches have been adapted from SOLAS Chapter X "Safety measures for high-speed craft". A draft of this Section, along with a Regulatory Impact Statement (RIS) was released for public comment on 6 December 2006.

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CONTENTS

FOREWORD CHAPTER 1 1.1 1.2 1.3 1.4 1.5 1.6 CHAPTER 2 2.1 ........................................................................................................ 3 PRELIMINARY ................................................................................ 9 Scope .............................................................................................. 9 Application....................................................................................... 9 Objective ......................................................................................... 9 Reference documents ..................................................................... 9 Abbreviations ................................................................................ 10 Definitions ..................................................................................... 11 WATERTIGHT AND WEATHERTIGHT INTEGRITY REQUIRED OUTCOMES ................................................................................. 17 Scope ............................................................................................ 17

Required outcomes................................................................................... 17 2.2 2.3 2.4 2.5 2.6 Likelihood of excessive water on deck to be controlled ................. 17 Risk of capsize or foundering by flooding through penetrations to be controlled ...................................................................................... 17 Preservation of function ................................................................. 17 Rapid drainage of water on deck ................................................... 18 Conditions of loading to be safe .................................................... 18

Deemed-to-satisfy .................................................................................... 18 2.7 Compliance ................................................................................... 18

Equivalent solutions .................................................................................. 18 2.8 CHAPTER 3 3.1 3.2 3.3 3.4 Assessment methods .................................................................... 18 DEEMED TO SATISFY SOLUTIONS FOR WATERTIGHT AND WEATHERTIGHT INTEGRITY ...................................................... 19 Scope ............................................................................................ 19 Application..................................................................................... 19 Sources of deemed to satisfy solutions ......................................... 19 Watertight and weathertight zones on a vessel ............................. 20 3.4.1 3.4.2 3.4.3 3.4.4

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Vessel to be divided into zones ..................................... 20 Reference points used in the determination of zones .... 22 Determination of zones.................................................. 26 Assignment of zone to penetrations............................... 27

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CHAPTER 4 4.1 4.2 4.3 4.4

FULLY DECKED VESSELS AND OPEN VESSELS...................... 28 Scope ............................................................................................ 28 Application..................................................................................... 28 Decked vessels ............................................................................. 28 Open vessels ................................................................................ 28 4.4.1 4.4.2 4.4.3 Limits in respect of application....................................... 28 Minimum freeboard to gunwale ..................................... 29 Transom design on vessels with outboards ................... 30

CHAPTER 5 5.1 5.2 5.3 5.4 5.5

WATERTIGHT INTEGRITY PROVISIONS FOR ZONES 1 AND 2 31 Scope ............................................................................................ 31 Application..................................................................................... 31 Objective ....................................................................................... 31 Types of penetrations .................................................................... 31 System inlets and discharges ........................................................ 33 5.5.1 5.5.2 Means to reduce the consequences of failure of system watertight integrity ........................................................ 33 Means to reduce the likelihood of back-flooding through discharges ..................................................................... 33

5.6

Windows and portlights ................................................................. 34 5.6.1 5.6.2 5.6.3 5.6.4 5.6.5 Limitations on use ......................................................... 34 Limitations on location ................................................... 34 Construction .................................................................. 35 Protection from damage ................................................ 35 Side scuttles arranged to provide ventilation ................. 36

5.7 5.8

Ventilators and air pipes ................................................................ 37 Large ports to facilitate access for cargo or by personnel when in port ................................................................................................ 37 5.8.1 5.8.2 5.8.3 5.8.4 5.8.5 Limitations on location ................................................... 37 Strength and watertight integrity .................................... 37 Doors on ports to be arranged to limit likelihood of breach37 Controls on opening and closure ................................... 37 Inner door ...................................................................... 38

5.9

Hatchways through decks ............................................................. 38

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CHAPTER 6 6.1 6.2 6.3 6.4 6.5 6.6 6.7

WATERTIGHT INTEGRITY PROVISIONS FOR ZONES 3, 4, 5 AND 6 ................................................................... 39 Scope ............................................................................................ 39 Application..................................................................................... 39 Objective ....................................................................................... 39 Construction of the effective watertight envelope .......................... 39 Assumptions of buoyant volume to be maintained ......................... 39 Exclusions from application of provisions ...................................... 40 Allowance for local deck erections ................................................. 40 6.7.1 6.7.2 Inclined local deck erections (ventilators and air pipes only) .............................................................................. 40 Local deck erections of limited size and specified location40

6.8 6.9

Types of penetrations .................................................................... 42 System inlets and discharges ........................................................ 42 6.9.1 6.9.2 System inlets and discharges located in Zone 3 ............ 42 System inlets and discharges located in Zones 4, 5 or 6 .............................................................. 42

6.10

Hatchways..................................................................................... 43 6.10.1 6.10.2 6.10.3 6.10.4 Types of hatchways ....................................................... 43 Types of hatch covers on large hatchways .................... 44 Construction .................................................................. 44 Hatch coamings............................................................. 44

6.11

Doorways ...................................................................................... 46 6.11.1 6.11.2 6.11.3 Construction .................................................................. 46 Installation and securing ................................................ 46 Door sills ....................................................................... 47

6.12

Ventilators ..................................................................................... 48 6.12.1 6.12.2 6.12.3 6.12.4 6.12.5 Application..................................................................... 48 Minimum coaming height ............................................... 48 Construction .................................................................. 49 Closing appliances ........................................................ 49 Dorade boxes ................................................................ 50

6.13

Air pipes ........................................................................................ 52 6.13.1 Height above deck ......................................................... 52

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6.13.2 6.13.3 6.14

Construction .................................................................. 52 Closing devices ............................................................. 52

Windows and portlights ................................................................. 52 6.14.1 6.14.2 6.14.3 Spaces subject to damage from contents ...................... 52 Windows........................................................................ 52 Portlights ....................................................................... 54

6.15

Skylights ........................................................................................ 56 6.15.1 6.15.2 6.15.3 6.15.4 Skylights to be of robust construction ............................ 56 Alternative for skylights in Zones 5 or 6 ......................... 56 Skylights intended to be opened for ventilation .............. 56 Skylights intended to also serve as hatchways .............. 56

6.16

Anchor cable locker, Hawse pipes and spurling pipes ................... 56 6.16.1 6.16.2 Hawse pipes .................................................................. 56 Anchor cable locker and spurlling pipes ........................ 57

CHAPTER 7 7.1 7.2 7.3

TESTS FOR WATERTIGHT AND WEATHERTIGHT INTEGRITY 58 Scope ............................................................................................ 58 Application..................................................................................... 58 Hose testing .................................................................................. 58 7.3.1 7.3.2 7.3.3 General ......................................................................... 58 Watertight integrity ........................................................ 58 Weathertight integrity..................................................... 59

7.4 7.5 CHAPTER 8 8.1 8.2 8.3 8.4 8.5 CHAPTER 9 9.1 9.2 9.3

Alternatives to hose testing ........................................................... 59 Prototype testing ........................................................................... 60 FREEBOARD AND BUOYANCY AT THE BOW ............................ 61 Scope ............................................................................................ 61 Application..................................................................................... 61 Objective ....................................................................................... 61 Minimum bow height ..................................................................... 61 Longitudinal extent of bow height protection .................................. 62 FREEBOARD MARK ..................................................................... 63 Application..................................................................................... 63 Location ........................................................................................ 63 Multiple modes of operation .......................................................... 63

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9.4 CHAPTER 10 10.1 10.2 10.3 10.4 10.5 10.6

Marking ......................................................................................... 63 DRAINAGE OF WELLS AND COCKPITS ..................................... 65 Scope ............................................................................................ 65 Application..................................................................................... 65 Objective ....................................................................................... 65 Definitions ..................................................................................... 65 General requirements.................................................................... 65 Drainage of wells ........................................................................... 66 10.6.1 10.6.2 Minimum drainage area ................................................. 66 Exclusions in way of a deckhouse or trunk .................... 68

10.7

Drainage of cockpits ...................................................................... 69 10.7.1 10.7.2 Application..................................................................... 69 Minimum drainage area ................................................. 69

10.8

Open structures that form recesses ............................................... 71 10.8.1 10.8.2 10.8.3 10.8.4 Application..................................................................... 71 Open superstructures and other large spaces ............... 71 Open spaces considered as cockpits ............................ 72 Spaces with weathertight closing appliances not complying with Chapter 6 .............................................. 72

10.9

Design of drainage arrangements ................................................. 72 10.9.1 10.9.2 10.9.3 General provisions ........................................................ 72 Freeing ports ................................................................. 73 Scuppers ....................................................................... 73

ANNEX A A1 A2 A3 A4 A5 A6

PORTLIGHT, SIDE SCUTTLE AND WINDOW PANES AND WINDOW FRAMES ....................................................................... 74 Scope ............................................................................................ 74 Application..................................................................................... 74 Materials ....................................................................................... 74 Pane thickness .............................................................................. 75 Frames and supporting structure ................................................... 79 Installation ..................................................................................... 80

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CHAPTER 1

1.1

USLC 5C, 5D

PRELIMINARY

SCOPE This Subsection specifies minimum requirements for the watertight and weathertight integrity of vessels. This Section shall be read in conjunction with Part B--General Requirements, Part C Subsection 6A--Intact Stability Criteria, Part C Subsection 6B--Buoyancy and Stability after Flooding, and Part C Subsection 6C--Stability Tests and Stability Information.

1.2

USLC 5C, 5D

APPLICATION This Section applies to all vessels other than Special Vessels provided for in NSCV Part F of this standard, unless NSCV Part F specifies otherwise.

NOTE: The penetrations considered within this Section may also impact on the vessel`s compliance with provisions contained in NSCV Part C Subsections 6A and 6B. The location, nature and height of penetrations should therefore also take into account the potential affect on downflooding when the vessel is heeled and, where applicable, when flooded.

1.3

New

OBJECTIVE The objectives of this Section are-- a) To prevent water from entering the vessel and rendering ineffective-- i) ii) b) spaces assumed intact for compliance with the relevant buoyancy and stability criteria, and spaces that serve to provide functions essential for the safety of the vessel.

To minimise the likelihood that large quantities of water will lie on the exposed decks of a vessel which would otherwise lead to-- i) ii) iii) A reduction in stability caused by the additional weight and free surface of water trapped on deck; Increased likelihood of flooding through penetrations on deck; and Increased risk to personnel engaged in duties on deck.

1.4

New

REFERENCE DOCUMENTS The following documents are referenced in this Subsection. Any document referenced should be considered to be the latest revision of the document, including amendments, unless stated otherwise. NATIONAL MARINE SAFETY COMMITTEE National Standard for Commercial Vessels Part B--General Requirements Part C--Design and Construction Section 3: Construction

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Section 4: Fire Safety Section 6: Stability Subsection 6A--Intact Stability Criteria Subsection 6B--Stability and Buoyancy after Flooding Subsection 6C--Stability Tests and Stability Information Part E--Operational Practices Part F--Special Vessels BRITISH STANDARDS BS ISO 21005:2004: Ships and marine technology - Thermally toughened safety-glass panes for windows and side scuttles. INTERNATIONAL STANDARDS ORGANIZATION ISO 1751: Shipbuilding and marine structures - Ships' side scuttles. ISO 3903: Shipbuilding and marine structures - Ships' ordinary rectangular windows ISO 8339: Building construction ­ Sealants ­ Determination of tensile properties (Extension to break) ISO 9093-1: Small craft - Seacocks and through-hull fittings - Part 1: Metallic. ISO 9093-2: Small craft - Seacocks and through-hull fittings - Part 2: Nonmetallic. ISO 12216: Small craft - Windows, portlights, hatches, deadlights and doors - Strength and watertightness requirements. ISO 12217-1: Small craft - Stability and buoyancy assessment and categorization - Part 1: Non-sailing boats of hull length greater than or equal to 6 m (TC 188/WG22 Doc N-381 Review Draft 2) INTERNATIONAL MARITIME ORGANIZATION IMO Resolution MSC.143(77) Adoption of amendments to the protocol of 1988 relating to the International Convention on Load Lines, 1966. IMO Resolution MSC.194(80) Adoption of amendments to the International Convention For The Safety of Life at Sea, 1974, as amended. The Torremolinos International Convention for the Safety of Fishing Vessels, as modified by the Torremolinos Protocol of 1993 STANDARDS AUSTRALIA AS 1799--Small Pleasure Boats Code Part 1: General requirements for power boats 1.5

New

ABBREVIATIONS ICLL-- Convention on Load Lines, as amended by the Protocol of 1988

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SFV-- The Torremolinos International Convention for the Safety of Fishing Vessels, as modified by the Torremolinos Protocol of 1993 SOLAS Ch II-1-- Chapter II-1 of the International Convention for the Safety of Life at Sea 1974, as amended 1.6

USLC 5C1, 5C61

DEFINITIONS For the purposes of this Subsection -- The definitions provided in this clause shall apply, a) the following definitions provided in Part B--General Requirements of the NSCV shall apply: abnormal conditions, accommodation space, breadth, cargo space, control station, crew, hazard, measured length, nautical mile, operational area, passenger, passenger vessel, risk, sheltered waters, superstructure, vessel, weathertight deck. the following definitions provided in Part C Section 6 Subsection 6A ­ Intact Stability Requirements of the NSCV shall apply: collared vessel, displacement, waterplane.

b)

For the purposes of this Subsection -- air pipe-- a fitting that provides a connection between the fluid within an enclosed space and the open air, where the space being served is not intended for human occupation in normal conditions of operation.

NOTES: 1. Air pipes are provided to prevent a differential of pressure that may arise from the transfer of liquids or from thermal expansion; or to reduce condensation from changes of temperature. Air pipes are relatively small in cross-sectional area relative to the volume of the space they serve. Spaces served by air pipes may be categorised as confined spaces under OH&S legislation; see separate definition for ventilatior below.

2. 3.

buoyant volume-- the volume comprised of all buoyant spaces of the vessel as described in Part C6C Stability Tests and Stability Information, Annex G, that also comply with the watertight and weathertight requirements of this Section. closed system-- a system for the utilization of fluids on a vessel that effectively contains and isolates the contents from buoyant spaces, see Figure 1b). For the purposes of this definition, tanks that are an integral part of the closed system are excluded from buoyant spaces on the vessel.

NOTE: It is assumed that the filling of tank spaces that are part of the closed system has been accounted for in intact and flooded buoyancy and stability analysis. EXAMPLE:

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Sea water engine cooling system

Figure 1 -- Conceptual illustration of open, closed and partially closed systems (valves, non-returns, etc. not shown) deadlight-- a strong shutter or plate intended to maintain watertight or weathertight integrity that is permanently affixed to a sidescuttle or portlight and arranged to be rapidly fastened over the pane at times of heightened risk of breakage such as during stormy weather, or when the pane is broken. deepest loaded waterline (LWL:Tmax)-- refer to Clause 3.4.2.1. discharge-- an opening for the release of fluid through the effective watertight envelope from an open system or closed system. drain-- a particular type of discharge being a pipe or conduit leading from an open sink or similar appliance and which discharges overboard.

NOTE: A drain is an open system relative to the space containing the sink or appliance. A drain is a closed system to spaces through which piping may transit.

effective watertight envelope-- the outside boundary of the buoyant volume for the purposes of compliance with intact stability and flooded criteria in Section 6. It comprises the watertight envelope formed by the hull bottom and topsides, decks, superstructures and deckhouses, having any penetrations and openings that are compliant with the relevant provisions of this Section.

NOTE: Depending upon their nature and location, some openings need not themselves be watertight, hence the use of the term effective`.

exposed forward portion-- a portion of the vessel`s length from the bow that is assumed to be exposed to increased likelihood of inundation by seawater and/or heavy spray.

NOTE: Applicable to vessels in Operational Areas A, B, C and D, see Figure 2.

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freeboard datum (Datum:Fb)-- a line parallel to the deepest loaded waterline at and below which all penetrations of the effective watertight envelope are protected by permanent watertight means as specified in this standard, and above which all penetrations of the effective watertight envelope are protected by either watertight or weathertight means as specified in this standard, see also Clause 3.4.2.3. freeboard mark-- a marking on each side of the vessel. Simultaneous immersion of the freeboard marks indicates non-compliance with one or more provisions of the NSCV.

NOTE: See also definition for statutory load line.

fully decked vessel-- a vessel having the buoyant volume fully enclosed by an effective watertight envelope that include watertight decks and structures having-- i) ii) any penetrations with closing appliances complying with Chapter 6; and drainage complying with Chapter 9.

inlet-- an opening through the effective watertight envelope into an open system or closed system of the vessel for the purpose of permitting fluids to enter a system served by the opening. open system-- a structural arrangement including a system for the utilization of fluids on a vessel that may compromise the effective integrity of buoyant spaces on a vessel, see Figure 1a).

EXAMPLE:

Open systems include arrangements such as scuppers, drains, side scuttles, hatches and doors. open vessel-- a vessel where the buoyant volume is not totally enclosed by the effective watertight envelope. An open vessel is a vessel that is not a fully decked vessel. partially closed system-- a system which is closed relative to certain spaces within the buoyant volume but which is also open relative to other spaces, , see Figure 1c).

EXAMPLE:

A scupper that drains the deck within a superstructure, passes through the compartment below that deck and discharges overboard through the side of the vessel, see Figure 1c). partially decked vessel-- an open vessel that is partially protected from swamping as follows-- a) at least two-thirds of the horizontal projection of the sheerline area is equipped with decking, cabins, shelters or rigid covers having--

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i) ii) b)

any penetrations with closing appliances complying with Chapter 6; and drainage complying with Chapter 9.

the protected areas include-- i) ii) all that within Lm/3 from the fore part of the hull, where Lm is the measured length of the vessel; and the area 100 mm inboard from the point of intersection of the deck with the hull sides of the vessel.

positive means of closing-- a manner of closing an inlet or outlet that provides direct feedback (via visual, remote indicator or direct physical means) to the operator as to the state of closure of the opening, and that is unlikely to open inadvertently in conditions up to abnormal conditions. portlight-- an opening not exceeding 0.6 m2 (equivalent to 800 mm x 750 mm) for the transmission of light having a substantial transparent or translucent barrier (referred to as the pane) and other measures that prevent the passage of water with a high level of reliability.

NOTES: 1. 2. Portlights may be either of watertight type or weathertight type depending upon application. Portlights are designed with load factors in excess of those for windows to reduce the likelihood of failure in the event of high loading or impact loading.

portlight of robust construction-- a portlight having-- a) b) a pane of non-brittle material; and a frame designed to retain the pane in the event of a point load at the centre of the pane, the magnitude of which is calculated as being the total design load arising from the design pressure over the area of the pane.

reference waterline Zone 1 (LWL:TZ1)-- refer to Clause 3.4.2.2. reference levels-- refer to Clause 3.4.2.4. reserve buoyancy-- an amount of buoyant volume in excess of that required to float the vessel in a stationary condition in fresh water, with the vessel in its heaviest loaded condition, measured in cubic metres. skylight-- an opening for the transmission of light not being a side scuttle; oriented at an angle less than 45 degrees to the horizontal in the closed position and with a substantial transparent or translucent pane that prevents the passage of water in the closed position.

NOTES:

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1. 2.

Skylights may be either of watertight type or weathertight type depending upon application. Skylights are designed to withstand potential loading by persons and/or contact by falling items.

side scuttle-- a portlight having an area not exceeding 0.16 m2.

NOTES: 1. 2. An area of 0.16 m equates to 450 mm in diameter. Side scuttles may be portlights of robust construction

2

statutory load line-- a specific freeboard mark determined in accordance with the ICLL, immersion of which would normally be in direct breach of legislative provisions.

NOTE: See also definition for freeboard mark.

storm cover-- a structure intended to be used, where permitted, in lieu of a deadlight for a window or portlight, but which may be fitted externally to the space penetrated by the window or portlight. ventilator-- a fitting that provides a connection between the air within an enclosed space and the open air for the purposes of ventilating a space.

NOTES: 1. 2. Ventilators are distinguished from air pipes in that the former serve to provide a safe environment for persons within space in normal conditions of operation. Ventilators are relatively large in cross-sectional area relative to the volume of the space they serve.

watertight-- for any location, having scantlings and arrangements capable of preventing the passage of water under a head of water assuming; a) b) a static waterline 76 mm above the freeboard datum; or, if the vessel is required to survive flooding by Part C Subsection 6B ­ Buoyancy and Stability after flooding, assuming a static waterline that results in the highest head experienced at that location, with a static waterline 76 mm above the freeboard datum, at the final flooded waterline or at any intermediate stage of flooding.

NOTE: A maximum head may be experienced in two different locations at different equilibrium conditions or different intermediate stages of flooding.

weathertight-- for all weather conditions up to and including extreme weather, having scantlings and arrangements at that location capable of preventing the passage of all but a negligible quantity of water.

NOTE: A negligible quantity of water means water ingress that is so small that the cumulative effects (without the use of bilge pumps) over the entire voyage are unlikely to place persons or the vessel at risk.

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window-- an opening for the transmission of light capable of being closed weathertight, not being a portlight nor a skylight. Where there is any duplication in the terms defined between this Clause and other Parts and Sections of the NSCV, the definitions in this clause shall apply.

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CHAPTER 2

2.1

New

WATERTIGHT AND WEATHERTIGHT INTEGRITY REQUIRED OUTCOMES

SCOPE This Chapter specifies the required outcomes for watertight and weathertight integrity including the provision of adequate reserves of buoyancy and protection of buoyancy from exposure to large quantities of water on deck. The corresponding sources for deemed-to-satisfy and equivalent solutions are set out in Chapter 3, and the deemed-to-satisfy solutions are set out in Chapter 4 to Chapter 9.

REQUIRED OUTCOMES 2.2

New

LIKELIHOOD OF EXCESSIVE WATER ON DECK TO BE CONTROLLED A vessel must be designed and constructed to prevent or limit the quantity of water encroaching on deck in normal and abnormal conditions arising from wave action, operational heeling moments, pitching motions and/or loading.

NOTE: This required outcome is achieved by means of deemed-to-satisfy requirements for minimum freeboard and minimum bow height.

2.3

New

RISK OF CAPSIZE OR FOUNDERING BY FLOODING THROUGH PENETRATIONS TO BE CONTROLLED Penetrations through the effective watertight envelope must prevent or control to acceptable levels the unintentional entry of water into the buoyant volume, in both normal and abnormal conditions, that might result in the vessel capsizing or sinking.

NOTES. 1. Penetrations include those for the operation of mechanical, fluid or navigational systems of the vessel and those penetrations provided for the movement of persons, cargo and equipment. Water, the entry of which is uncontrolled, may be from any source outside of the control of the vessel or its systems. It includes waves, broken water and rain acting upon the hull, the exposed decks and penetrations.

2.

2.4

New

PRESERVATION OF FUNCTION A vessel must have arrangements to prevent or control to acceptable levels the risk that systems and/or spaces necessary for the safety of the vessel could be rendered inoperative by exposure to and/or entry of water in normal or abnormal conditions.

NOTES: 1. A vessel would not normally be expected to survive two or more independent abnormal hazards concurrently (e.g. such as weathering a storm and fighting a fire simultaneously) because the likelihood of such hazards occurring at the same time is so small as to render the risk acceptable. An inability to access a space containing a system essential to the safety of the vessel due to water on deck is considered to render the system inoperative.

2.

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2.5

New

RAPID DRAINAGE OF WATER ON DECK A vessel must have arrangements to prevent or control to acceptable levels the likelihood that in both normal and abnormal conditions, water that encroaches upon the vessel deck will be retained on the deck and in recesses.

NOTE: Besides reducing reserves of stability, buoyancy and freeboard, water remaining on deck or in recesses also has the potential to directly compromise safety of personnel. For provisions only for the safety of personnel, NSCV Part C Section 1 provides minimum requirements.

2.6

New

CONDITIONS OF LOADING TO BE SAFE The loading and operation of the vessel must be controlled to prevent or minimise the consequences from the uncontrolled encroachment of water in or on the vessel, in normal or abnormal conditions. Persons responsible for the safety of the vessel must have ready access to reliable and quickly assessable information needed to identify hazards, control loading and undertake any other essential actions needed to secure the vessel`s watertight and weathertight integrity.

NOTE: Persons responsible for safety include vessel masters and enforcement bodies.

DEEMED-TO-SATISFY 2.7

New

COMPLIANCE For the purpose of this National Standard, the watertight and weathertight integrity of a vessel shall be deemed-to-satisfy the Required Outcomes of Clauses 2.2 to 2.6 to the extent specified by this Section if it complies with the relevant provisions of Chapter 3 to Chapter 9.

EQUIVALENT SOLUTIONS 2.8

New

ASSESSMENT METHODS Assessment methods for equivalent solutions applicable to watertight and weathertight integrity shall comply with Part B of this Standard.

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CHAPTER 3

3.1

New

DEEMED TO SATISFY SOLUTIONS FOR WATERTIGHT AND WEATHERTIGHT INTEGRITY

SCOPE This Chapter specifies the sources of the deemed-to-satisfy solutions for watertight and weathertight integrity of vessels. It also establishes zones on vessels for the purposes of applying Chapter 5, Chapter 6 and Chapter 9. APPLICATION This Chapter applies to all vessels specified in Clause 1.2. SOURCES OF DEEMED TO SATISFY SOLUTIONS The watertight and weathertight integrity provisions on a vessel shall be deemed-to-satisfy the required outcomes 2.2 to 2.6 of this Section if the vessel complies with the standards specified in Table 1. Table 1 -- Deemed to satisfy solutions for watertight and weathertight integrity

Operational Area Class 1 Passenger and Class 2 Non-passenger L m 25 m A, B L m < 25 m L m 46.9 m C L m < 46.9 m D, E KEY: Lm = Measured Length, in metres ICLL = International Convention on Load Lines NSCV = The deemed to satisfy provisions contained within Chapter 4 to Chapter 9 of this Section SFV = Provisions relevant to watertight and weathertight integrity contained in Torremolinos International Convention for the Safety of Fishing Vessels SOLAS = Provisions relevant to watertight and weathertight integrity contained in IMO Convention on the Safety of Life at Sea (includes HSC Code which may be applicable to vessels that fall outside the definition of NSCV fast craft) NSCV NSCV L m < 46.9 m NSCV NSCV NSCV ICLL and SOLAS L m < 46.9 m L m 46.9 m NSCV ICLL and SOLAS Class 3 Fishing

3.2

New

3.3

USL Sect 7 Clause 3.5

L m 46.9 m

SFV

SFV

Specifiic Question for public comment #1. Do you support the proposals in Table 1 given the background below?

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Part C Section 2

Table 1 represents a relaxation of the current USL Code requirement for the application of the International Convention on Load Lines in that 1. the length threshold for Class 1A, 1B, 2A and 2B vessels has been shifted from 24 m measured length to 25 metres measured length to better align with the ICLL threshold of 24 metres load line length (assuming a factor of 0.96 as the correlation between loadline length and measured length).. 2. The length threshold for application of ICLL for Class 1C and 2C vessels has been shifted from 24 m measured length to 46.9 m (Approximately 500GT based on the 45 m equivalent of loadline length used in Torremolinmos Safety of Fishing Vessels divided by 0.96). 3. There is no requirement for Class 2D and 2E vessels 24 metres measured length or more to be assigned a minimum freeboard in accordance with ICLL. Notwithstanding the application of the ICLL, a vessel is required to operate at a draft not exceeding that permitted by the least value of: the scantling calculations, intact stability and, where applicable, flooding provisions. For vessels of measured length 25m or more, a freeboard mark would be marked in accordance with Chapter 9. This freeboard mark is not a statutory loadline but one provided for the information of the operator. The proposal limits the application of the Load Line Convention to Operational Area C vessels 46.9 m measured length or more and Operational Area A and B vessels 25 m measured length or more on the basis that ICLL Article 6(1) states-- Article 6 - Exemptions (1). Ships when engaged on international voyages between the near neighbouring ports of two or more States may be exempted by the Administration from the provisions of the present Convention, so long as they shall remain engaged on such voyages, if the Governments of the States in which such ports are situated shall be satisfied that the sheltered nature or conditions of such voyages between such ports make it unreasonable or impracticable to apply the provisions of the present Convention to ships engaged on such voyages.

Specifiic Question for public comment #2. Should the threshold length for application of the ICLL load line provisions on Class 1C and 2C vessels be 46.9m measured length, 35 m measured length or some other length? 3.4 3.4.1

New

WATERTIGHT AND WEATHERTIGHT ZONES ON A VESSEL Vessel to be divided into zones The vessel shall, for the purpose of applying the deemed-to-satisfy provisions specified in Chapter 5, Chapter 6 and Chapter 9, be divided into

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Part C Section

zones illustrated by Figure 2. Each zone shall have the functional characterisics specified in Table 2. Table 2 -- Table of immersion risk zones in order of decreasing risk

Zone No. and colour code (1) Description Normal conditions Extended immersion Abnormal conditions Extended immersion Watertight. Robust construction Two independent means of preventing inflow. Prohibition on arrangements that are easily compromised by human error Protection principles

1

Immersed hull

2

Exposed hull topsides & deck

Frequent immersion

Extended immersion

Watertight Height above load waterline relative to wave height Robust construction or backup means of preventing inflow. Controls on arrangements that are easily compromised by human error

3

Exposed Equivalent to ICLL Position 1

Transient immersion

Frequent immersion

Weathertight Height above load waterline relative to wave height Height above adjacent deck or other horizontal surface Robust construction or backup means of preventing inflow Normally kept closed & secured

4

Partially protected Equivalent to ICLL Position 2

Infrequent immersion Heavy spray Quantities of water on deck Light spray Rainwater

Transient immersion

Weathertight Height above load waterline relative to wave height Height above adjacent deck or other horizontal surface Robust construction or backup means of preventing inflow.

5

Protected Equivalent to Lloyds SSC Position 1

Heavy spray Quantities of water on deck Light spray Rainwater

Weathertight Height above load waterline relative to wave height Height above adjacent deck or other horizontal surface Weathertight Height above adjacent deck or other horizontal surface

6

Benign Equivalent to Lloyds SSC Position 2

Rainwater

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Part C Section 2

3.4.2 3.4.2.1

USL 5C.1.3

Reference points used in the determination of zones Deepest loaded waterline Deepest loaded waterline (LWL:Tmx) is the waterline determined at level trim relative to the baseline corresponding to maximum allowable displacement determined from the least value that satisfies-- a) b) c) the intact stability criteria of Part C Subsection 6A; the buoyancy and stability after flooding criteria of Part C Subsection 6B; and the maximum displacement assumed for determining scantlings used to satisfy Part C Section 3.

3.4.2.2

ICLL Reg 22

Reference waterline Zone 1 The reference waterline Zone 1 (WL:TZ1) for the purposes of determining the upper extent of Zone 1 shall be located a plane parallel to the deepest load waterline (LWL:Tmx) located the height specified in Table 3 above that waterline. See also Figure 2. Freeboard datum (Datum:Fb) The freeboard datum (Datum:Fb) shall be a plane parallel to the deepest loaded waterline (LWL:Tmx) located the height specified in Table 3 above that waterline. See also Figure 2. Reference levels Levels 1, 2, 3 and 4 in Figure 2 that are used for the purposes of determining zones shall be ascertained starting with the Freeboard Datum and adding the standard height specified in Table 3 to establish the location of Level 1. Levels 2, 3 and 4 shall be determined by adding the standard height cumulatively. Intermediate lengths For vessels of measured length lying between those specified in the first column of Table 3, the values for the freeboard datum and reference levels shall be determined by linear interpolation.

3.4.2.3

Based on ICLL Ch 3

3.4.2.4

New

3.4.2.5

ICLL Ch 3

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Part C Section

Figure 2 -- Determination of zones on vessels

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Part C Section 2

Table 3 -- Freeboard datum and reference levels

Reference waterline Zone 1 (WL:TZ1) above deepest load waterline (m) Operational Area A, B, C 7 10 15 20 24 30 40 50 60 70 75 80 90 100 110 120 125 130 (1) KEY: (1) For lengths greater than 130 metres in Operational Areas A, B and C: (a) The height of the reference waterline above the deepest load waterline in metres shall be determined by the formula 0.01 x Lm (b) The height to the freeboard datum in millimetres shall be determined by the formula

6 4 3 2

Length 0.96Lm (m)

Freeboard datum (Datum:Fb) above deepest load waterline (m) Operational Area A, B, C 0.20 0.26 0.36 0.47 0.55 0.63 0.79 1.00 1.24 1.51 1.66 1.82 2.16 2.53 2.94 3.37 3.54 3.72 D 0.20 0.26 0.36 0.47 0.55 0.63 0.79 1.00 1.24 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 E 0.20 0.25 0.34 0.43 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50

Standard height of each reference level above the previous reference level (m) Operational Area A, B 0.90 0.90 1.22 1.59 1.80 1.80 1.80 1.80 1.80 1.80 1.80 1.85 1.95 2.05 2.15 2.25 2.30 2.30 C 0.90 0.90 1.06 1.24 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.39 1.46 1.54 1.61 1.69 1.73 1.73 D 0.90 0.90 0.98 1.08 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.16 1.22 1.28 1.34 1.41 1.44 1.44 E 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90

D, E 0.10 0.12 0.16 0.20 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23

0.10 0.12 0.17 0.21 0.24 0.30 0.40 0.50 0.60 0.70 0.75 0.80 0.90 1.00 1.10 1.20 1.25 1.30

2 10

0.96Lm

0.0014 0.96Lm

0.379 0.96Lm

4.6496 0.96Lm

467.52

where Lm is the measured length, in metres. (c) For all other columns the value remains the same as those at length 130 metres.

Specifiic Question for public comment #3. Do you support the values specified in Table 3 given the background below? Background: Table 3 has been generated using the current ICLL as a basis and modifying it assuming a series of conservative assumptions. The key points of the approach are listed below:

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1. Tabular values for Type B are applied, modified for the following corrections: > 100 m length, block coefficient, depth and sheer. All these are freeboard additions to the tabular freeboard. 2. The freeboard correction for length assumes the length of superstructure is 17.5% of the length. 3. The block coefficient correction assumes a Cb of 0.85. 4. The depth correction assumes a L/D ratio of 10. 5. The sheer correction assumes a vessel without sheer. 6. The Reference Waterline for Operational Area A, B and C Zone 1 is based on ICLL Regulation 22(1)a) requirement for discharge pipes located less than 1% of the vessel's length below waterline. 7. The Reference waterline for Operational Areas D and E Zone 1 is based on USL Code Clause C72.2 with vessels less than 23 metres being subject to the 1% length as per seagoing. 8. The freeboard datum for Operational Area D follows the that for Class A, B and C up to a freeboard corresponding to the 90% significant wave height of 1.5 metres. At this value, the freeboard datum stays in the same location for larger vessels. This corresponds to the approach taken for RoRo vessels water on deck and bow door requirements where a freeboard exceeding the operating significant wave height significantly reduces the level of protection required. 9. A similar approach is taken for Operational Area E as for Operational Area D, except that the threshold freeboard is taken to be 0.5 m. This value is in the same order as the old 300 mm minimum freeboard frequently applied to vessels such as barges and houseboats operating in smooth waters. 9A. For vessels less than 24 metres, the minimum freeboard of 200 mm from the UK MCA MGN 280 requirement has been adopted for 7 metres and less, (compare against 300 mm in the current USL Code for barges and houseboats and 250 mm in the USL Code for cockpit and well deck vessels). The intermediate values from 7 metres to 24 metres are obtained by linear interpolation. At 18 metres, the UK MGN 280 specifies a minimum 400 mm and the proposal specifies 430 mm. 10. The ICLL heights for superstructures have been used to determine the heights between levels for Operational areas A and B over 24 metres. 11. For operational area C the values for A and B have been multiplied by 0.75 as this is the ratio of the design wave height in Table 6 of NSCV Part B. 12. For operational area D, the values for A and B have been multiplied by 0.625, this being reasonably conservative given that 5/8 freeboard is allowed for Class C dredgers, and RQD under ICLL can be as low as 50% of the standard superstructure height on a full seagoing vessel.

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13. For operational area E, a value of 0.9 m has been adopted for the height between levels on the basis of the RQD height in ICLL. This is very conservative given it raises the total freeboard to 180% of the significant wave height. 14. For vessels under 24 metres, the value of 0.9m has been adopted for the height between levels for all vessels up to 10 metres on the basis that the vessel length relative to wave length changes the nature of motions in a seaway. Between 10 metres and 24 metres, the height is determined by linear interpolation. The proposal is not scientifically based in an absolute sense. However, it provides relaxations to the full ICLL criteria based on conservative assumptions taking into account the characteristics of the actual fleet, wave heights, relevant national and international standards and the existing USL Code. It attempts to reflect what a prudent but pragmatic surveyor would accept in the absence of full scientific rigour. 3.4.3

New

Determination of zones The Zones 1 to 6 for a particular vessel shall be determined by superimposing the reference levels determined for the specific vessel length and area of operation onto the profile of the vessel and applying the applicable arrangement of zones shown in Figure 2 a) to Figure 2 c).

EXAMPLE:

An example of the determination of the zones on a seagoing vessel is illustrated in Figure 3. A tier of accommodation may have different zones applied at the top and bottom. Specifiic Question for public comment #4. Do you support the arrangement of Zones and exposed forward portion for the various Operational Areas shown in Figure 1 given the background below? Background: The illustrations have been based on the following: 1. For Operational Areas A, B and C: The ICLL Position 1 and Position 2 Resolution MSC 143(77). 2. For Operational Area D, ICLL Position 1 modified to reflect the experience embodied in the configuration of the Manly Ferries. 3. For Operational Area E, current USL Code requirements for Zone 5 and assuming the application of Zone 6.

NOTE: The assignment of a variety of zones is intended to provide maximum flexibility within the deemed-to-satisfy solution. However, there is a negative aspect in that the determination of requirements becomes more complex. Nothing in this standard precludes simplifying the application of this standard by adopting the requirements for a more onerous zone for locations that would otherwise be categorised as a less onerous zone.

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3.4.4

Assignment of zone to penetrations A penetration shall be subject to the provisions of a zone if its lowest point at penetration through effective watertight envelope lies below the upper level of that zone.

EXAMPLES:

A window that lies partly in Zone 3 and Zone 4 would be subject to the provisions for Zone 3. A ventilator that penetrates the deck at Zone 4 but has a coaming that extends beyond Zone 4 into Zone 5 would be subject to the provisions for Zone 4. A hatchway that passes through the deck in Zone 3 but which has a coaming extending beyond Zone 3 into Zone 4 would be subject to the provisions for Zone 3.

Figure 3 -- Example of the application of zones to a vessel

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Part C Section 2

CHAPTER 4

4.1

Part B Clause 3.9

FULLY DECKED VESSELS AND OPEN VESSELS

SCOPE This Chapter specifies whether vessels are required to be fitted with a weathertight deck or whether they may be partially decked or fully open. APPLICATION This Chapter applies to all vessels specified in Table 1 as being subject to the provisions of Chapter 4 to Chapter 9. DECKED VESSELS Subject to Clause 4.4, the buoyant volume of a vessel shall be enclosed by a watertight deck that forms the top of the effective watertight envelope. Penetrations through the deck shall be protected by watertight or weather tight enclosures as specified in Chapter 6. Recesses formed by wells, cockpits, etc on the deck shall be drained in accordance with the provisions specified in Chapter 9. OPEN VESSELS Limits in respect of application As an alternative to the arrangement specified in Clause 4.3, certain vessels as specified in Table 4 may be of open configuration, subject to the length and/or passenger limitations and the specified conditions of acceptance. Table 4 -- Deemed-to-satisfy permitted applications for open vessels

Class of service 1A, 1B, 1C 1D, 1E 1D Length and/or pax limitations All lengths 15 m or > 36 pax < 15 m and < 36 pax Arrangement as an open vessel Not deemed-to-satisfy Not deemed-to-satisfy Deemed-to-satisfy subject to conditions Compliance with swamped comprehensive flooding criteria Compliance with swamped level flotation; or Partially-decked vessel 1E Class 2-- NonPassenger vessels 2A, 2B 2C 2C < 6 m and 36 pax All lengths 15 m or < 15 m with pax without pax < 15 m and 6 m Deemed-to-satisfy if subject to conditions Not deemed-to-satisfy Not deemed-to-satisfy Deemed-to-satisfy (2) subject to conditions Compliance with swamped level flotation; or Compliance with swamped level flotation Conditions of acceptance of vessel being open (1)

4.2

New

4.3

USL s.7 s.5C.55 s.5C.61.4 s.5C.67 s.5D.2.3 s.5D.19.1

4.4 4.4.1

Part B Clause 3.9 See Error! Reference source not found.

Vessel use category Class 1-- Passenger vessels

1E

< 15 m and 6 m and 36 pax

Deemed-to-satisfy subject to conditions

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Partially-decked vessel 2C 2D, 2E 2D, 2E 2D, 2E 2D, 2E 2D, 2E Class 3-- Fishing vessels 3A, 3B 3C without pax <6m 15 m < 15 m and 6 m and with pax < 15 m and 6 m and without pax < 6 m and with pax < 6 m and without pax All lengths 15 m < 15 m and 6 m Deemed-to-satisfy (2) subject to conditions Not deemed to satisfy Deemed-to-satisfy subject to conditions Deemed-to-satisfy Deemed-to-satisfy subject to conditions Deemed-to-satisfy subject to conditions Not deemed-to-satisfy Not deemed to satisfy Deemed-to-satisfy (2) subject to conditions Deemed-to-satisfy (2) subject to conditions Not deemed to satisfy Deemed-to-satisfy Deemed-to-satisfy subject to conditions Compliance with basic flotation Compliance with swamped level flotation; or Partially-decked vessel 3C 3D, 3E 3D, 3E 3D, 3E KEY: (1) Refer to NSCV Part C Subsection 6B Chapter 4 and Chapter 8. (2) Not deemed-to-satisfy for vessels that carry sail <6m 15 m < 15 m and 6 m <6m Compliance with swamped level flotation Compliance with level flotation Compliance with basic flotation Partially-decked vessel if 2D Compliance with swamped level flotation

3C

Specifiic Question for public comment #5. Do you agree with the proposed content of Table 4 that lists limitations on the use of open boats? Background: Factors that were taken into account included: a) The effective preclusion of open vessels in the load line calculations. b) Clause 3.9 in Part B that precludes open vessels carrying passengers to sea. c) The limitation on the use of flotation materials for buoyancy to vessels up to 15 metres length in the USL Code. d) The ABP standard requiring buoyancy in vessels up to 6 metres length. e) The limitations on open vessels contained in the ISO 12217 standards including those that carry sail. 4.4.2

UK MCA MGN 280 12.2.2.1.2)

Minimum freeboard to gunwale An open vessel, other than a collared vessel complying with the relevant provisions of the NSCV, when fully loaded shall have a clear height of side

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Part C Section 2

between the deepest load waterline and the lowest part of the gunwale (see note) of not less than 400 mm for vessels 7 metres in length or under and not less than 690 mm for vessels 15 metres in length. For a vessel of intermediate length the clear height should be determined by linear interpolation.

NOTE: The clear height of the side should be measured to the top of the gunwale or capping or to the top of the wash strake if one is fitted above the capping.

4.4.3

UK MCA MGN 280 12.2.2.1.2)

Transom design on vessels with outboards An open vessel that is permitted in Table 4 to proceed to sea, other than a collared vessel complying with the relevant provisions of the NSCV, shall have a minimum freeboard at the transom not less than that specified in Clause 4.4.2.

NOTE: For vessels propelled by outboards, this may require the fitting of an outboard well or pod to avoid the reduction in freeboard associated with the cutout for a transom mounted outboard.

Specifiic Question for public comment #6. Do you support the application of minimum freeboards for open boats that proceed to sea; and in particular the minimum freeboard that would limit the size of cutout at the stern for mounting an outboard motor? Background: Clauses 4.4.2 and 4.4.3 are based on the MCA MGN 280 provision 12.2.2.1.2). Public comment is sought on any potential hardship that such a provision might add relative to current safe practice.

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Part C Section

CHAPTER 5

5.1 USL s.5C, s5D SCOPE

WATERTIGHT INTEGRITY PROVISIONS FOR ZONES 1 AND 2

This Chapter specifies minimum deemed-to-satisfy solutions for the watertight integrity of the effective watertight envelope of a vessel in Zones 1 and 2.

NOTE: Zones 1 and 2 are as defined in Clause 3.4.3.

5.2

New

APPLICATION This Chapter applies to penetrations of the effective watertight envelope on vessels in Zones 1 and 2, as specified in Figure 2. OBJECTIVE The objective of this Chapter is to reduce to a minimum the likelihood that water will enter buoyant spaces of the vessel in normal and abnormal conditions of operation.

NOTE: It is assumed that all openings not part of closed systems in Zones 1 and 2 will be closed and secured prior to leaving smooth waters and will remain so until the vessel enters smooth waters.

5.3

New

5.4

USL s.5C, 5D

TYPES OF PENETRATIONS Penetrations shall comply with the requirements in Table 5 Table 5 --Deemed-to-satisfy solutions for penetrations in Zones 1 and 2

Penetration System inlets and discharges Windows and portlights Ventilators and air pipes Large ports Hatchways through decks Relevant clause 5.5 5.6 5.7 5.8 5.9

Specifiic Question for public comment #7. To what extent should the ISO Small Craft standards be applied to commercial vessel watertight and weathertight integrity? Feedback arising from application of these standards to actual vessels would be especially valued. Background: The reference group considered the option of adopting watertight and weathertight integrity standards from the ISO Small Craft standards for vessels operating light operations as defined in NSCV Part C Section 3 Construction.

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The following ISO standards appear to be relevant. ISO 11812 applies for cockpit drainage ISO 12216 applies for windows, portlights, hatches, deadlights and doors ISO 9093 applies for sea cocks and through hull fittings The first two refer to design categories so any application of these standards needs to have a table of equivalence similar to Table 5 in Part C Section 3. Commentators are invited to compare these ISO requirements against the USL Code/NSCV and provide feedback. The relevant clauses and table from Part C Section 3 are given below. Table 5 -- Relationship between NSCV operational area categories and ISO design categories

NSCV Operational Area Category A B Equivalent ISO Design Category Nil Nil A: Ocean C B: Offshore B Offshore D C: Inshore Additional conditions

Not applicable Not applicable None Not to operate in wave heights greater than 4 m significant, nor wind force exceeding 7 Beaufort None Not to operate in wave heights greater than 2 m significant, nor wind force exceeding 6 Beaufort None Except for sailing vessels, not to operate in wind force exceeding 4 Beaufort

C: Inshore E D: Sheltered waters

Definitions: robust operations-- operations of a vessel that in normal circumstances may be exposed to loading arising from-- a) heavy seas (for example all Class A and Class B vessels and seagoing patrol vessels); b) heavy loads from cargo, machinery, deck machinery or rigging (for example cargo vessels, ro-ro vessels, trawlers, crane barges, dredgers, tankers, etc.); c) heavy or frequent impacts (for example tugs, ferries, barges, tugs); d) frequent grounding (for example landing craft and large houseboats); or e) large accelerations and slamming (for example vessels used for skiing and wake boarding, thrill ride vessels, and dive vessels).

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light operations-- operations of a vessel that are characterised by relatively light loading in normal circumstances; i.e., operations that are not robust operations.

NOTES: 1. Light operations would be applicable to most hire and drive vessels (Class 4) and vessels intended primarily for sport and recreation. 2. A vessel designed for light operations may be limited as to its suitability for other purposes.

5.5 5.5.1

USL 5C.48 5C.72 5D.11 5D.28

SYSTEM INLETS AND DISCHARGES Means to reduce the consequences of failure of system watertight integrity Penetrations for both open and closed systems through the effective watertight envelope in Zones 1 and 2 shall be fitted with an effective and readily accessible means for preventing water from flooding buoyant spaces should there be a failure of the system, in accordance with Table 6. The valve where fitted shall be mounted either immediately adjacent to the shell plating or on a sea chest or standpipe of robustness and longevity not less than that of the shell plating.

NOTE: Sea chests and standpipes may need to incorporate an additional corrosion allowance appropriate to the construction material of the standpipe, it`s accessibility for internal inspection and/or maintenance, and the temperature and corrosive characteristics of the fluid within the system.

5.5.2

USL s.5C.46.1; 5C.69.6 5D.11 5D.28

Means to reduce the likelihood of back-flooding through discharges With the exception of exhaust pipe discharges that are specifically considered in NSCV Part C Subsection 5A, penetrations for open systems shall incorporate arrangements specified in Table 6 that prevent inadvertent back-flooding of buoyant spaces. A non-return valve, where fitted, need not be immediately adjacent to the shell plating or standpipe.

NOTE: Any equivalent solution that proposes a single positive means of closure that is kept closed and secured in conditions likely to result in backflooding as being equivalent should be considered in the context of the likelihood of the use of the discharge being controlled, the consequences of the valve being left open and the options for corrective action should backflooding occur.

Table 6 -- Penetrations for open and closed systems in Zones 1 and 2 (for exhaust pipe discharges refer to NSCV Part C Subsection 5A)

Application Requirement Location Size of inlet/discharge Small ( 50 mm dia or equivalent) Zone 1 Required with positive means of closing. Need not be operable from deck above except if inaccessible Large (> 50 mm dia or equivalent) Required with positive means of closing. Operable from deck above except if machinery space and accessible

Open and closed systems: Inlets and discharges

Valve in accordance with NSCV Part C Subsection 5A

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Part C Section 2

Application

Requirement

Location

Size of inlet/discharge Small ( 50 mm dia or equivalent) Large (> 50 mm dia or equivalent) Required. Single non-return suffices without positive means of closing

Zone 2

Required subject to exception Single non-return suffices without positive means of closing Exception if system is of non-corroding robust construction

Additional requirement for open systems

Non-return valve

Zone 1 Zone 2

Required subject to exception (1) Required subject to exception (1)

Required subject to exception (1) Required subject to exception (1)

KEY: (1) Exception: excludes overboard scuppers and overboard drains serving enclosed spaces that do not extend below Level 1 in Figure 2.

5.6 5.6.1 5.6.1.1

New (clear statement of 5.6.1.2 implied reqt) USL s.5C.42, 43, 44 5C.69 5D.10 5D.27

WINDOWS AND PORTLIGHTS Limitations on use Windows Windows shall not penetrate the effective watertight envelope in Zones 1 or 2. Portlights Portlights in Zones 1 and 2 shall be side scuttles.

NOTES: 1. Subsequent subclauses within Clause 5.6 use the term side scuttle instead of portlight.

(3) Proposals for locating portlights that do not qualify as side scuttles within Zones 1 or 2 (such as on glass bottom boats, semi-submersibles and owner`s suites on large motor yachts) would be subject to review as a proposal for an equivalent solution with consideration given to the likelihood and consequences of failure in the context of the proposed operation and the configuration of the vessel, as well as the persons that might be occupying the space. (4) Portlights in such locations would be expected to be no less effective than side scuttles at the same location.

5.6.2 5.6.2.1

USL s.5C.42, 43, 44 5C.69 5D.10 5D.27

Limitations on location Proximity to waterline Side scuttles on vessels shall be located so that the distance between the deepest load waterline and the sill of the side scuttle is not less than the value given in Table 7.

NOTE: Proposals for locating side scuttles lower than specified in this Clause would be subject to review as a proposal for an equivalent solution with consideration given to the likelihood and consequences of failure in the context of the proposed operation and the configuration of the vessel, as well as the persons that might be occupying the space.

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Part C Section

Table 7 -- Lowest deemed-to-satisfy location of lowest point of sill of side scuttles

Operational areas A, B and C Measured length 50 m or less Lowest point of sill of side scuttle 500 mm Reference waterline Zone 1 (WL:TZ1) See Table 3 Operational areas D and E Measured length All lengths Lowest point of sill of side scuttle Reference waterline Zone 1 (WL:TZ1) See Table 3

Greater than 50 m

5.6.2.2

USL s.5C.45.1

Spaces subject to damage from contents Side scuttles shall not be fitted in compartments in which-- a) b) the side scuttle may be subject to damage from internal contents; or the internal contents may preclude access to the side scuttle in the event of damage.

EXAMPLE

Cargo holds Chain lockers 5.6.2.3

USL s.5C.45.1

Spaces of high fire risk Side scuttles fitted in spaces of high fire risk as specified in NSCV Part C Section 4 shall comply with the structural fire protection and structural integrity requirements of that Section applicable to the particular boundary in which the side scuttle is mounted.

NOTE: Spaces of high fire risk are determined in NSCV Part C Section 4.

5.6.3

USL s.5C.42.4 5C.69.5 5D.10.3 5D.27.3

Construction Side scuttles (frames, deadlights and panes) shall be of watertight construction providing strength and robustness not less than that of the adjacent hull. Side scuttles shall comply with ISO Standard 1751 Type A with the option of panes complying with Annex A.

NOTE: Side scuttles with non-metallic frames may not have characteristics of strength and robustness sufficient for application in Zone 2. Refer to ISO Stanard 1751 Type A.

5.6.4 5.6.4.1

USL s.5C.42.4 5C.69.5 5D.10.3 5D.27.3

Protection from damage Frames The frame of side scuttles shall not protrude more than 15 mm outboard of the outside surface of the side shell. Side scuttles on vessels subject to impacts shall be recessed inboard of the side shell a distance not less than half the least dimension of the pane of the side scuttle.

EXAMPLES:

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Part C Section 2

Vessels subject to impacts include tugs, offshore supply vessels, fishing trawlers, patrol and rescue craft. 5.6.4.2 5.6.4.2.1

USL s.5C.44 5C.69.4 5D.10.1 5D.27.1

Deadlights General requirement for side scuttles in Zone 2 Subject to Clause 5.6.4.2.1, each side scuttle in Zone 2 shall be fitted with permanent hinged inside deadlight capable of being closed and secured watertight in the event of the pane breaking.

5.6.4.2.2

Lloyds Inland Waterways 8.3.2. Lloyds SSC 7.12.2

Sheltered water vessels less than 24 m in length Side scuttles in a vessel for operational area D or E of measured length 25 m or less, located in way of accommodation spaces that lies in way of Zone 2 may be provided with portable deadlights sufficient for not less than 20 per cent of the total number of openings. At least one deadlight shall be provided for every size of opening. Portable deadlights are to be clearly marked to indicate which side scuttles they fit and stowed in such a way as to be readily fitted.

5.6.5 5.6.5.1

New

Side scuttles arranged to provide ventilation Application This Clause applies to opening side scuttles that are intended to be opened only when in port.

NOTE: Opening side scuttles that are intended as part of the primary means of ventilation of a space are also considered as ventilators and Clause 5.7 applies.

5.6.5.2

USL s.5C.43 5C.69.3

Limitations on location on vessels of higher flooding risk Side scuttles on vessels of Flooding Risk Category III or IV shall be of the non-opening type if their being left open would compromise the extent of flooding protection requirements specified in Subsection 6B.

NOTES: 1. 2. 3. The Flooding Risk Category of vessels is determined in NSCV Part C Subsection 6B. Applies only where vessel is required to survive flooding. Applicable in both equilibrium and intermediate flooding conditions.

5.6.5.3

ABS Guide for HSC Part 3 Sec20.6

Limitations on location in spaces of high fire risk Side scuttles in high fire risk spaces on vessels of Fire Risk Category III or IV shall be of the non-opening type. Side scuttles in other spaces of high fire risk shall be of non-opening type if their being left open would compromise the effectiveness of a fixed fire extinguishing system serving the space.

NOTES: 1. 2. Spaces of high fire risk are determined in NSCV Part C Section 4. Typically gaseous and aerosol FFE systems require the space to be completely sealed.

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5.6.5.4

USL s.5C.43, 57 5C.69.3 5D.9, 10.3

Controls on opening and closure Where their use is permitted in Zone 2, opening side scuttles shall be arranged so that they may be opened only with the consent of the master by means of a key or special tool that does not form part of the scuttle. VENTILATORS AND AIR PIPES Openings for ventilators and air pipes that penetrate the effective watertight envelope shall not be located in Zones 1 or 2. LARGE PORTS TO FACILITATE ACCESS FOR CARGO OR BY PERSONNEL WHEN IN PORT Limitations on location Vessels required to survive flooding Large ports fitted below the bulkhead deck giving access to compartments considered intact on a vessel required to survive flooding shall be located as to have their lowest point above the deepest subdivision draft.

NOTE: Refer to NSCV Part C Subsection 6B

5.7

USL s.5C.42.1, 42.2, 715D.25 & 26

5.8 5.8.1 5.8.1.1

SOLAS Reg.15.8.9

5.8.1.2

USL s.5C.42 5D.9 ICLL r21

Minimum freeboard otherwise The lower sill of large ports intended to facilitate access for cargo or by personnel when stationary in smooth waters shall be located not less than 230 mm above the deepest load waterline. Strength and watertight integrity When closed and secured, each large port in combination with its door shall have strength and watertight integrity not less than that of the surrounding hull structure. Doors on ports to be arranged to limit likelihood of breach The door shall be designed and arranged to facilitate its ongoing watertight integrity and strength by-- a) b) avoiding long-term exposure to detrimental cyclic loading of the hinging and locking mechanisms; and arranging seals to remain effective during and after movement arising from flexure and/or wear.

NOTE: This can be facilitated by designing the port door to open outwards.

5.8.2

USL s.5C.42 5D.9 ICLL r21

5.8.3

ICLL Reg 21.1

5.8.4

ICLL Reg 21.5

Controls on opening and closure Each large port shall be arranged so that it may be opened only by members of the crew, and with the knowledge of the master. Arrangements shall be provided at the operating compartment to confirm that-- a) b) the door locking mechanism is fully engaged; and water is not leaking into the space containing the large port.

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5.8.5

ICLL Reg 21.5

Inner door On vessels of Operational Area A, B or C, large ports located within the forward 25 per cent of the measured length shall have a second inner door of equivalent strength and watertightness to prevent flooding of the space should the outer door fail. This requirement need not apply if the vessel, with the compartment served by the large port assumed flooded, meets a one compartment standard of local flooding in accordance with NSCV Part C Subsection 6B. HATCHWAYS THROUGH DECKS Access and/or inspection hatch ways in exposed decks or platforms located in Zone 2 (i.e., below the level of the freeboard datum) and leading into spaces comprising the buoyant volume shall be avoided wherever practicable.

NOTE: Penetrations through decks of low freeboard substantially increases the vessel`s vulnerability to rapid flooding should be closing appliance fail through being left open or deterioration.

5.9

USL s.5C.42 5D.9 ICLL Reg 21

Where such hatchways are provided, they shall be-- a) b) c) d) kept as small as practicable; arranged so as not to be opened when underway; closed by robust watertight covers; and for hatchways of area exceeding 0.6 m2, the covers shall be secured by closely spaced bolts.

NOTE: Plastic inspection ports sometimes fitted to small vessels are liable to degradation over time, causing them to leak through cracking of components or stripping of threads

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CHAPTER 6

6.1

USLC 5C, 5D

WATERTIGHT INTEGRITY PROVISIONS FOR ZONES 3, 4, 5 AND 6

SCOPE This Chapter specifies minimum deemed-to-satisfy solutions for the watertight and weathertight integrity of the effective watertight envelope of a vessel in Zones 3, 4, 5 and 6, as applicable. APPLICATION Subject to Clauses 6.4 and 6.6, this Chapter applies to penetrations of the effective watertight envelope on vessels in Zones 3, 4, 5 and 6 as specified in Figure 2. Penetrations through bulkheads and decks in Zones 3 or 4 not forming the effective watertight envelope shall also comply with the provisions of this Chapter if by virtue of design; water entering a space via a penetration would result in a significant reduction in the vessel`s safety.

EXAMPLE:

6.2

USLC 5C, 5D

A deckhouse in Zone 3 not taken into account for stability calculations but which does not have means to rapidly discharge entrapped water. 6.3

New

OBJECTIVE The objective of this Chapter is to reduce to a minimum the likelihood that large quantities of water will, in both normal and abnormal conditions of operation-- a) b) enter the buoyant volume of the vessel, or enter other spaces essential for the safety of the vessel;

while allowing for sufficient access and ventilation for the safe and effective operation of the vessel.

NOTE: It is assumed that all openings in Zone 3, not being part of closed systems, ventilators or air pipes will be closed and secured prior to leaving sheltered waters and will, other than for access, remain so until returning to sheltered waters.

6.4

ICLL Reg 11

CONSTRUCTION OF THE EFFECTIVE WATERTIGHT ENVELOPE Bulkheads and decks forming the boundaries of the effective watertight envelope shall be constructed in accordance with NSCV Part C Section 3 to maintain their integrity against water penetration when exposed to hydrostatic pressure, weather and seas in normal and abnormal conditions of operation. ASSUMPTIONS OF BUOYANT VOLUME TO BE MAINTAINED The watertight and weathertight integrity of individual penetrations through the effective watertight envelope may also be prerequisites for the assumptions applied for the purposes of compliance with criteria for intact stability in Part C Subsection 6A and/or buoyancy and stability after

6.5

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flooding in Part C Subsection 6B. Where the assumptions provide for higher standards relative to the provisions of this Chapter, the former shall prevail.

NOTE: 1. The assumptions referred to may include intact volume for the purposes of determining intact and/or flooded hydrostatics and KN values, downflooding points for determining downflooding angles and range of positive stability, and minimum freeboard criteria in the flooded condition. The assumptions may take into account flooding of a space, in which case the space lies outside the effective watertight envelope.

2.

6.6

EXCLUSIONS FROM APPLICATION OF PROVISIONS Penetrations through the effective watertight envelope need not comply with the provisions of this Chapter where by virtue of design, water entering the buoyant volume via a penetration would have negligible effect on the vessel`s safety. Such arrangements shall be assessed as a proposal for an equivalent solution.

NOTE: These arrangements are likely to involve measures that significantly limit the extent of flooding, or for which the effect of flooding has been analysed to show equivalence. EXAMPLE:

CO2 drain opening to a CO2 bottle locker inset into a buoyant deck structure. 6.7 6.7.1

NEW

ALLOWANCE FOR LOCAL DECK ERECTIONS Inclined local deck erections (ventilators and air pipes only) The local deck erection below a ventilator or air pipe may be counted as part of the coaming or sill height where the upper surfaces of the local deck erection are inclined not less than 20 degrees to the horizontal; see Detail B in Figure 4. Local deck erections of limited size and specified location Subject to the next paragraph, where in the following Clauses, there is a reference to a minimum coaming or sill height above an adjacent deck; and the particular component is raised on a local deck erection (e.g.; a coachhouse, trunk, etc); the required coaming or sill height may be reduced by 50 per cent of the height of the local deck erection; but not greater than that amount that would result in the coaming or sill being less than the height of the required height of the coaming or sill applicable to the next Zone above. This clause shall be limited to applications complying with all of the following: a) The local deck erection shall be located on decks not liable to form wells; i.e., decks not enclosed by solid bulwarks;

6.7.2

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b)

The horizontal surface of the local deck erection shall have a minimum dimension not exceeding 60 per cent of the breadth of the vessel (see Figure 4); and The sills or coamings shall be located abaft the exposed forward portion of the vessel and within 30 per cent of the breadth of the vessel outboard of the centreline (see Figure 4).

c)

Specific Question for public comment #8. Do you agree with the proposals to reduce the required coaming height of sills and coamings on local raised structures? Background: The current requirements make no allowance for ventilators, etc on small deck erections. A very common application is on raised coachhouses on yachts. The proposal has been drafted to be relatively conservative. The 30 per cent either side of centreline is based on the minimum width of trunks from ILLC.

Figure 4 -- Allowance for local deck erections

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6.8

TYPES OF PENETRATIONS Penetrations shall comply with the requirements in Table 8. Table 8 --Deemed-to-satisfy solutions for penetrations in Zones 3, 4, 5 and 6

Penetration System inlets and discharges Hatchways Doorways Ventilators Air pipes Windows and portlights Skylights Anchor cable locker, hawse pipes and spurling pipes Relevant clause 6.9 6.10 6.11 6.12 6.13 6.14 6.15 6.16

6.9 6.9.1

ICLL Reg. 22 (Table 22.1)

SYSTEM INLETS AND DISCHARGES System inlets and discharges located in Zone 3 Penetrations of partially closed systems through the effective watertight envelope in Zone 3 leading into the buoyant volume shall be either-- a) fully enclosed for a height above the upper edge of the discharge not less than the air pipe height specified in Clause 6.13.1 for Zone 3 (see Figure 5 A), C) and D)); or fitted with a non-return valve if they are enclosed for a height less than the air pipe height above the top of discharge; see Figure 5 B).

NOTE: Penetrations in Zone 3 of fully enclosed systems need not be fitted with a valve.

b)

6.9.2

ICLL Reg. 22 (Table 22.1)

System inlets and discharges located in Zones 4, 5 or 6 Penetrations of partially closed systems through the effective watertight envelope in Zones 4, 5 or 6 leading into the buoyant volume shall either be-- a) enclosed for a height above any adjacent deck of not less than the air pipe height specified in Clause 6.13.1 for the particular Zone, see Figure 5 E); or fitted with a non-return valve if they are enclosed for a height less than the air pipe height above the top of discharge; see Figure 5 F).

b)

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Figure 5 -- Scupper discharges in Zones 3 and 4 6.10 6.10.1

NEW

HATCHWAYS Types of hatchways For the purposes of this Section, two types of hatchways are defined: large hatchway-- a hatchway not being an access hatchway.

EXAMPLE:

Hatchways for loading and unloading of cargo or stores; or for the removal of machinery; or for access where the area of opening exceeds 0.64 m2. access hatchway-- a hatchway of limited size for the passage of persons or goods having an area of opening not exceeding 0.64 m2. Drafting note: The value of 0.64m2 was based on the IMO minimum size of hatches for escapes on passenger ships of 800mm x 800mm specified in IMO SOLAS MSC/Circular.847

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6.10.2

ICLL regs 14 , 15 and 16

Types of hatch covers on large hatchways Hatch covers on large hatchways shall be-- a) of steel, aluminium, FRP or an equivalent structurally homogenous material capable of being rendered weathertight by means of gaskets and clamping devices; (where permitted by Clause 6.10.4.1.2) of steel, aluminium, FRP or an equivalent structurally homogenous material capable of being rendered watertight by means of gaskets and closely spaced bolts; or (where permitted by Column 4 of Table 9) comprised of portable covers secured weathertight by tarpaulins and battening devices.

b)

c)

NOTE: Physical tests for tightness are undertaken at the initial survey, and may be required at renewal and annual surveys or at more frequent intervals.

6.10.3 6.10.3.1

ICLL regs 15 and 16

Construction General The scantlings and construction of hatch covers, hatch coamings and securing devices shall comply with the applicable deemed-to-satisfy requirements specified in NSCV Part C Seciton 3 for the particular type of vessel. Large hatchways For large hatchways on seagoing vessels-- a) b) the design load on hatch covers arising from wave action shall be not less than 19.6 kPa in Zone 3 and 14.7 kPa in Zone 4. hatch covers that rest on coamings shall be located in their closed position by means capable of withstanding horizontally acting loads in any sea conditions.

6.10.3.2

ICLL regs 15 and 16

Hatch covers comprising portable covers secured weathertight by tarpaulins and battening devices shall comply with ICLL Regulation 15. 6.10.3.3

ICLL Reg 18

Access hatchways Access hatchways, including manholes and flush scuttles in Zones 3 or 4 shall be closed by substantial covers capable of being made watertight. Unless secured by closely spaced bolts, the covers shall be permanently attached. Hatch coamings

6.10.4

6.10.4.1 Large hatchways 6.10.4.1.1 Hatchways fitted with weathertight covers

ICLL Regs 13 & 14-1

Large hatchways that are fitted with weathertight hatch covers shall be protected by a hatch coaming of height above the adjacent deck not less than that specified in Column 3 of Table 9. Large hatchways that will never be opened when the vessel is underway may have hatch coamings reduced or omitted entirely provided the hatch

6.10.4.1.2 Hatchways with reduced coaming height

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cover is watertight. The hatch cover shall be marked with a sign stating the conditions placed on use of the hatchway.

EXAMPLE:

A hatchway intended solely for the removal of machinery to facilitate servicing might be marked "This hatch to be kept closed and secured at all times, except when servicing machinery in port". 6.10.4.2

ICLL Regs 13 and 17

Access hatchways Access hatchways that, for normal operations, may need to be opened in severe seas shall be protected by a hatch coaming of height above the adjacent deck not less than that specified in Column 5 of Table 9.

NOTES: 1. 2. Not required for Operational Area E. Does not apply to alternative escape hatchways

EXAMPLES:

Severe weather access hatchway to propulsion machinery Severe weather access hatchway to accommodation space

NEW

Access hatchways that do not need to be opened in severe weather and which are fitted with weathertight hatch covers shall be protected by a hatch coaming of height above the adjacent deck not less than that specified in Column 6 of Table 9. The coamings specified in Column 6 may be reduced or omitted entirely on access hatchways having watertight covers.

NOTE: Access hatch coamings on hatches serving as escapes from spaces may become a limiting downflooding point for the criteria for buoyancy and stability after flooding in NSCV Part C Subsection 6B.

ICLL Reg 14-1

Table 9 --Deemed-to-satisfy coaming/sill heights for hatchways and doors in Zones 3, 4, 5 and 6

1 Operational area 2 Zone (1) 3 Coamings on large hatchways (above deck in mm) 4 Large hatchways sealed by portable covers & made weathertight by tarpaulins Not DtS Not DtS DtS DtS Not DtS DtS 5 6

Coamings on access hatchways and sills on doors (above deck in mm) Where access essential for safety 600.fL As per Column 6 As per Column 6 As per Column 6 450.fL As per Column 6 Where access not essential for safety 380.fL 380.fL 240.fL 150.fL 285.fL 285.fL

A or B

3 4 5 6

600.fL 450.fL 340.fL 255.fL 450.fL 340.fL

C

3 4

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1 Operational area

2 Zone (1)

3 Coamings on large hatchways (above deck in mm)

4 Large hatchways sealed by portable covers & made weathertight by tarpaulins DtS DtS DtS DtS DtS DtS DtS DtS DtS DtS

5

6

Coamings on access hatchways and sills on doors (above deck in mm) Where access essential for safety As per Column 6 As per Column 6 250.fL As per Column 6 As per Column 6 As per Column 6 N/A As per Column 6 As per Column 6 As per Column 6 Where access not essential for safety 180.fL 115.fL 160.fL / 100 min 160.fL / 100 min 100 Not specified N/A 100 Not specified Not specified

5 6 D 3 4 5 6 E 3 4 5 6 KEY:

255.fL 190.fL 250.fL 190.fL / 100 min 140.fL / 100 min 105.fL / 100 min N/A 100 100 100

(1) Zone is determined by the deck on which the coaming or sill is located. fL = a coefficient depending upon the measured length of the vessel = 1 if Lm 24 m = 0.7 if Lm < 24 m and Lm > 10 m = 0.5 if Lm 10 m.

6.11 6.11.1

ILLC Reg 12-1

DOORWAYS Construction All doorways through vertical bulkheads forming boundaries of the effective watertight envelope shall be fitted with doors that are-- a) b) c) permanently and strongly attached to the bulkhead; framed, stiffened and fitted so that the whole structure is of equivalent strength to the un-pierced bulkhead; and weathertight when closed.

6.11.2

ILLC Reg 12-1

Installation and securing Doors shall be arranged so that they can be operated from both sides of the bulkhead Doors in Zone 3 shall also-- a) b) open outwards to provide additional security against the impact of the sea; and incorporate a positive means for securing doors weathertight that is permanently attached to the bulkhead or to the doors themselves.

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EXAMPLE:

Gaskets and clamping devices provide a positive means for securing doors weathertight. 6.11.3 6.11.3.1

ILLC Regs 13 and 17

Door sills Minimum sill height Doors that, for normal operations, may need to be opened in severe seas shall be protected by a door sill of height above the adjacent deck not less than that specified in Column 5 of Table 9.

NOTES: 1. 2. Not required for Operational Area E. Does not apply to alternative escape hatchways

EXAMPLES:

Severe weather access doorway to propulsion machinery Severe weather access doorway to accommodation space Doorway to gain access to the anchor windlass

ILLC Reg 12-3

Doors that do not need to be opened in severe weather and which are fitted with weathertight doors shall be protected by a door sill of height above the adjacent deck not less than that specified in Column 6 of Table 9.

NOTE: Doors sills on doors serving as evacuation paths from spaces may become a limiting downflooding point for the criteria for buoyancy and stability after flooding in NSCV Part C Subsection 6B.

6.11.3.2

NEW

Reduction in sill height for deck camber For a vessel of breadth B, the sill height for doors within 0.4B each side of the centreline on decks having deck camber of B/50 or greater may be reduced at their lowest height by the lesser of-- a) b) 30 per cent of the required sill height; or 50 per cent of the deck camber.

6.11.3.3

ILLC Reg 12-4

Portable sills Portable sills shall be avoided wherever practicable because of the increased likelihood of their not being in place at time of need. Where portable sills are fitted, they shall be-- a) b) installed before the vessel embarks on the passage into the operational area requiring sills; and gasketed and secured weathertight.

EXAMPLES:

A sill arranged for removal to facilitate the loading/unloading of heavy spare parts. A vessel having dual operational areas on doors not required to have sills when operating in sheltered waters.

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6.12 6.12.1

VENTILATORS Application Clause 6.12 applies to ventilators in Zones 3 to 6 that serve spaces within the effective watertight envelope that penetrate the effective watertight envelope.

NOTE: The Zone of a ventilator or air pipe is determined by the point at which it penetrates the effective watertight envelope.

6.12.2

ICLL Reg 17(3), 19(3)

Minimum coaming height Ventilators that provide air essential to the safety of the vessel (including, for seagoing vessels, the propulsion machinery) or ventilators that are mounted in the exposed topsides of the hull in the first Zone above the freeboard datum shall have coamings that comply with Column 5 of Table 10. Ventilators, including those in Column 5, shall have coamings above an adjacent exposed deck, of height not less than that specified in Column 3 of Table 10. Ventilators, including those in Column 5, that have trunks passing through deck structures that are not part of the effective weathertight envelope shall have coamings above the point where they penetrate the effective watertight envelope, of height not less than specified in Column 3 of Table 10. Table 10 --Deemed-to-satisfy coaming heights for ventilators and air pipes in Zones 3, 4, 5 and 6

1 Operational area 2 Zone 3 Minimum ventilator coaming height above an adjacent deck (1) (mm) 4 Closing Appliance & attachment 5 Minimum ventilator coaming height above the freeboard datum for-- a) ventilators required left open for safety, or b) ventilators located in exposed hull topsides within the first Zone above the freeboard datum (mm) Req`d PCA Req`d PCA Req`d Req`d Req`d PCA Req`d PCA Req`d Req`d Req`d PCA 1875.fL fV 3375.fL fV 4500.fL fV 760.fL 450.fL 265.fL 160.fL 570.fL 340.fL 200.fL 120.fL 320.fL 6 Air pipes above deck (1) (mm)

ICLL Reg 19(1)

ICLL Reg 19(2)

A or B

3 4 5 6

900.fL fV 760.fL fV 640.fL fV 540.fL fV 675.fL fV 570.fL fV 480.fL fV 405.fL fV 375.fL fV

C

3 4 5 6

D

3

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1 Operational area

2 Zone

3 Minimum ventilator coaming height above an adjacent deck (1) (mm)

4 Closing Appliance & attachment

5 Minimum ventilator coaming height above the freeboard datum for-- a) ventilators required left open for safety, or b) ventilators located in exposed hull topsides within the first Zone above the freeboard datum (mm)

6 Air pipes above deck (1) (mm)

4 5 6 E 3 4 5 6 KEY:

315.fL fV 265.fL fV 250.fL fV N/A 100 fL fV 120 fL fV 100 fL fV

Req`d PCA Req`d Not req`d N/A Req`d PCA Not req`d Not req`d

1875.fL fV

190.fL 100 Not specified

N/A 450.fL fV

N/A 100 Not specified Not specified

(1) Zone is determined by the point where the ventilator penetrates the effective watertight envelope fL = a coefficient depending upon the measured length of the vessel = 1 if Lm 24 m = 0.7 if Lm < 24 m and Lm > 10 m = 0.5 if Lm 10 m. fV = a coefficient depending upon the type of ventilator = 1 if a plain vent = 0.5 if the vent incorporates a dorade box complying with Clause 6.12.5 PCA = Permanently attached closing appliance

6.12.3

ICLL Reg 19(1)

Construction Coamings of ventilators shall be-- a) b) c) of robust construction capable of withstanding impacts likely in service; of strength at least equivalent to that of a deckhouse structure in the same location; and on ventilators of cantilever configuration having an unsupported coaming exceeding 900 mm in height; either specifically designed to withstand bending moments that arise from the cantilever; or provided with stays or other forms of additional support.

6.12.4

Closing appliances Except for a ventilator mounted on a coaming of increased height as specified in Column 5 of Table 10, or where otherwise specified in Column 4 of Table 10, each ventilator shall be fitted with a weathertight closing appliance.

ICLL Reg 19(4)

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Where specified in Column 4 of Table 10, certain ventilators on vessels of measured length less than 100 m shall have the closing appliance permanently attached to the ventilator. Otherwise the closing appliance shall be either permanently attached or stowed in a location ready and convenient for rapid closure of the ventilator. 6.12.5 6.12.5.1

New

Dorade boxes Types of dorade boxes Two type of dorade boxes are defined: a) b) A two-chamber dorade box (see Figure 6a)); and A single chamber dorade box (see Figure 6b)).

6.12.5.2

Deemed-to-satisfy requirements for dorade boxes The required ventilator coaming height in Columns 3 and 5 in Table 10 may be modified by applying the factor fv = 0.5 provided the vent incorporates a dorade box complying with Table 11.

NOTE: The reduction in coaming height may reduce the magnitude of the downflooding angle for use in Part C Subsection 6A and Part C Subsection 6B of this standard.

Table 11 -- Deemed-to-satisfy requirements for dorade boxes

Characteristic Vents kept open for safety Vents in exposed sides in the Zone above the freeboard datum Two chamber box not lower than the value specified in Column 5 of Table 10 assuming fv = 0.5 Other vents

Type of dorade box the lowest point of the exposed vent above the freeboard datum; hZ2 in Figure 6c) the lowest point of the exposed vent above an exposed deck; hvc in Figure 6b) the top of the baffle above an exposed deck (no example shown) dorade box drain Drain to be non-return type

Two chamber box not lower than the value specified in Column 5 of Table 10 assuming fv = 0.5

Single chamber box

Not applicable

Not applicable

Not applicable

Not lower than the value specified in Column 3 of Table 10 assuming fv = 0.5

not lower than the value specified in Column 3 of Table 10 Required Not required not less than the greater of 100 mm or the coaming height specified in Column 6 of Table 9

Not applicable

Not applicable

Required, Required not less than the greater of 100 mm or the coaming height specified in Column 6 of Table 9

Required Not required not less than the greater of 100 mm or 50 per cent of the coaming height specified in Column 6 of Table 9

Height of the coaming; hhc in Figure 6b)

NOTE: The top of the baffle forms the lowest sill for downflooding for the purposes of NSCV Subsections 6A and 6B (see Figure 6c)).

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Figure 6 -- Dorade boxes

Specific Question for public comment #9. Do you agree with the proposals to reduce the required coaming height of ventilators that are provided with dorade boxes? Background: The draft introduces a 50% reduction in the coaming height required for ventilators provided with dorade boxes on the basis that they considerably reduce the quantity of water that may enter a space in conditions of transient immersion. The result of this approach is that vents having dorade boxes can be considerably reduced in height. However ventilators on dorade boxes are treated no differently to other ventilators for the purposes of meeting intact and flooded stability criteria specified in Section 6 of this standard (i.e. for extended immersion) and the reduced height must be taken into account in that analysis.

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6.13 6.13.1

ICLL Reg 20(1), 20(2)

AIR PIPES Height above deck The height from the deck to the point where water may have access below shall be not less than the value specified in Column 6 of Table 10.

NOTE: In circumstances where these heights may interfere with the working of the vessel, a proposal to lower the height would be subject to consideration as a proposal for an Equivalent Solution, refer to NSCV Part B.

6.13.2

ICLL Reg 20(1)

Construction Air pipes shall be designed to resist breach and/or deformation arising from loads on deck in normal and abnormal conditions of operation. Exposed parts of air pipes shall be constructed to protect the watertight integrity of the effective watertight envelope.

NOTES: 1. 2. Loads include those arising from seas on decks, working of cargoes and shifting of heavy weights. Air pipes arranged as long unsupported cantilevers may be more liable to damage.

6.13.3

ICLL Reg 20(3)

Closing devices Air pipes in Zones 3 and 4 shall be provided with automatic closing devices.

6.14 6.14.1

New

WINDOWS AND PORTLIGHTS Spaces subject to damage from contents Windows shall not be fitted in compartments in way of Zones 3 or 4, or portlights shall not be fitted in compartments in way of Zone 3, where-- a) b) the window or portlight may be subject to damage from internal contents; or the internal contents may preclude access to the window or portlight to close the deadlight or storm cover in the event of the window or portlight being damaged.

EXAMPLE

Cargo spaces Certain store rooms 6.14.2 Windows

6.14.2.1 Permitted locations on the vessel 6.14.2.1.1 Not permitted in way of the buoyant volume

ICLL Reg.23.7 Lloyds Steel Ships Ch 4 Sec 6.3

Windows shall not be fitted in the effective watertight envelope of spaces considered to form the buoyant volume for the purposes of compliance with the intact and flooded criteria contained in Part C Section 6.

NOTE: NSCV Part C Subsection 6C Annex G limits the spaces considered intact for the purposes of stability analysis.

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6.14.2.1.2 Windows in spaces other than the buoyant volume Deemed-to-satisfy locations for windows in spaces not excluded by Clause 6.14.2.1.1 shall be limited to the locations specified in Table 12. Table 12 -- Deemed-to-satisfy locations for windows, portlights and side scuttles

Orientation Forward facing Location Within exposed forward portion of the vessel (see Figure 2) Within exposed forward portion of the vessel (see Figure 2) All locations Zone 3 Side scuttle or other portlight (1) Side scuttle or other portlight (1) Window (2), or a side scuttle or other portlight Zone 4 Window (2), or a side scuttle or other portlight Window (2), or a side scuttle or other portlight Window (2), or a side scuttle or other portlight Zone 5 Window (2), or a side scuttle or other portlight Window (2), or a side scuttle or other portlight Window (2), or a side scuttle or other portlight Zone 6 Window (2), or a side scuttle or other portlight Window (2), or a side scuttle or other portlight Window (2), or a side scuttle or other portlight

Side facing

Aft facing KEY:

(1) Only side scuttles are deemed-to-satisfy if the location-- i) is forward or side facing and lies within the exposed forward portion of the vessel (see Figure 2); and ii) is also subject to the requirements in Clause 6.14.2.1.1 applicable to penetrations through the effective watertight envelope in way of the buoyant volume. (2) Window is not deemed-to-satisfy if the location is also subject to the requirements in Clause 6.14.2.1.1 applicable to penetrations through the effective watertight envelope in way of the buoyant volume.

6.14.2.2

USL 5C.73 5D.36

Construction Windows shall comply with one of the following: a) b) c) The relevant provisions in Lloyds Rules; Annex A of this Section; or ISO 3903.

NOTE: Options a) and c) require design loads to be calculated in accordance with relevant Classification Society Rules. Option b) does not require access to Classification Society Rules.

6.14.2.3

ICLL Reg.23.9 Lloyds SSR Part4 Ch1 s.11 & Ch4 s.6.3.6, HSC 2.2.7

Storm covers Windows, where fitted on seagoing vessels, shall be provided with portable storm covers as specified in Table 13. Storm covers need not be provided for windows of robust construction.

NOTES: 1. A window of laminated glass, or of polycarbonate material complying with Annex A including the special deflection criterion in Clause A4.4 would normally be considered a window of robust construction.

(5) Proposals that substitute double panes in lieu of the provision of storm covers to be considered as a proposal for an equivalent solution.

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Table 13 -- Storm covers for windows on seagoing vessels (not applicable to windows of robust construction)

Orientation Forward facing Location Within exposed forward portion of the vessel (see Figure 2) Outside exposed forward portion of the vessel (see Figure 2) Side facing Within exposed forward portion of the vessel (see Figure 2) Other locations Zone 3 Windows not deemed-tosatisfy Windows not deemed-tosatisfy Windows not deemed-tosatisfy Windows not deemed-tosatisfy Required sufficient for any two Zone 4 Required sufficient for any two Required sufficient for any one Required sufficient for any two Required sufficient for any one Required sufficient for any one Zone 5 Required sufficient for any one Not required Zone 6 Not required

Not required

Required sufficient for any one Not required

Not required

Not required

Aft facing

All locations

Not required

Not required

KEY: Sufficient for any one means that sufficient storm covers are carried to enable any single window within the location described to be sealed should the pane be broken. Sufficient for any two means that sufficient storm covers are carried to enable any two windows within the location described to be sealed should their panes be broken.

6.14.3 6.14.3.1

Portlights Requirements for portlights in specified locations Subject to Clause 6.14.1, portlights if fitted shall be limited to side scuttles where specified in Table 12. Table 14 --Deemed-to-satisfy solutions for portlights in Zones 3, 4, 5 and 6

Requirement Relevant design standard Applicable clause 6.14.3.2 Zone 3 ISO Standard 1751 Type B Zone 4 ISO Standard 1751 Type C, or ISO Standard 3903 Type E Annex A (2) Zone 5 Annex A, or ISO Standard 3903 Type F; or relevant Lloyds Rules (1) Zone 6 Annex A, or ISO Standard 3903 Type F, or relevant Lloyds Rules (1)

Alternative pane thickness Frames and panes Deadlight Opening portlights 6.14.3.2, 6.14.3.3 6.14.3.3 6.14.3.4

Annex A (2)

Watertight Weathertight (4) Zone 3 coaming height above

Weathertight (3) Weathertight (4) Zone 4 coaming height above

Weathertight (3) Not required Zone 5 coaming height above

Weathertight Not required Zone 6 coaming height above any

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used for ventilation KEY:

any adjacent deck

any adjacent deck

any adjacent deck

adjacent deck

(1) Refer to NSCV Part C Section 3 Construction. (2) May facilitate application of lower grade ISO compliant portlights and windows in these locations on vessels less than 30 m in length. (3) Watertight if the distance between the lower edge of the portlight and an adjacent deck below is less than the required door sill height above any adjacent deck in the same location. (4) Not required for portlights of robust construction.

6.14.3.2

Construction The construction of portlights (frames, deadlights and panes) shall be of strength and robustness not less than that of the adjacent structure. The watertight and weathertight integrity of frames, deadlights (where required) and glasses, shall be as specified in Table 14.

6.14.3.3

Deadlights Portlights of robust construction need not be fitted with deadlights. Portlights that are not of robust construction shall be fitted with permanent hinged inside deadlights capable of being closed and secured in the event of the pane breaking, where specified in Table 14.

6.14.3.4 Portlights arranged to provide ventilation 6.14.3.4.1 Application Opening portlights and windows intended to serve as part of the primary means of ventilation of a space shall also comply with the relevant requirements specified in Clause 6.12. 6.14.3.4.2 Limitations on location on vessels of higher flooding risk Portlights shall be of the non-opening type if their being left open would compromise the flooded freeboard criteria for buoyancy and stability after flooding specified in Subsection 6B.

NOTES: 1. 2. Applies only to vessels of Flooding Risk Category III or IV where vessel is required to survive flooding. Applicable in both equilibrium and intermediate flooding conditions.

6.14.3.4.3 Limitations on location in spaces of high fire risk

ABS Guide for HSC Part 3 Sec20.6

Portlights in high fire risk spaces on vessels of Fire Risk Category III or IV shall be of the non-opening type. Portlights in other spaces of high fire risk shall be of non-opening type if their being left open would compromise the effectiveness of a fixed fire extinguishing system serving the space. Each opening portlight in Zones 3 or 4 shall be a side scuttle if their being left open would compromise compliance with the applicable intact stability criteria in Subsection 6A and/or the flooded GFZ curve criteria in Subsection 6B.

6.14.3.4.4 Limitations on size of opening portlights in Zones 3 or 4

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6.14.3.4.5 Minimum height above an adjacent deck The lower edge of the sill of opening portlights shall not be located at a height above an adjacent deck less than the minimum coaming height specified in Table 14. 6.15 6.15.1

ICLL Reg.23(12)

SKYLIGHTS Skylights to be of robust construction Except as specified in Clause 6.15.2, skylights, including clear hatch covers, shall be determined in accordance with the provisions for portlights including side scuttles in Clause 6.14. Alternative for skylights in Zones 5 or 6 Skylights in Zones 5 or 6 may be determined in accordance with the provisions for windows in Clause 6.14; provided-- a) b) The skylight is on a coaming of height not less than that specified for weathertight hatches in Clause 6.10; the skylight is protected from inadvertent contact by personnel or other mechanical damage by a grid of closely spaced bars on its exterior; and either-- i) ii) the vessel is for sheltered water operation; or the vessel is for seagoing service and the skylight does not enclose a space-- A) B) containing equipment essential for safety (e.g. the operating compartment); or with openings through decks leading directly into spaces forming the buoyant volume.

6.15.2

ICLL Reg.23(12)

c)

6.15.3

Skylights intended to be opened for ventilation Skylights intended to be opened for ventilation shall comply with the provisions for ventilators specified in Clause 6.12.

6.15.4

Skylights intended to also serve as hatchways Skylights intended to be opened for the passage of persons, sails, equipment, supplies, cargo, etc. shall comply with the provisions for hatchways specified in Clause 6.10.

6.16 6.16.1

ANCHOR CABLE LOCKER, HAWSE PIPES AND SPURLING PIPES Hawse pipes Hawse pipes shall be watertight where they penetrate the effective watertight envelope, including the connections at the side shell and deck.

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6.16.2 6.16.2.1

Anchor cable locker and spurling pipes Separated from other spaces On vessels of Operational Area A and B; and for vessels of Operational Areas C and D having the penetration for the spurling pipes in Zone 3, the following provisions apply: a) The volume within the anchor cable locker and spurling pipes shall be separated from the buoyant volume by watertight barriers. Bulkheads between separate anchor cable lockers, or which form a common boundary of anchor cable lockers, need not be watertight. If access into the anchor cable locker is provided from below the exposed deck, the access shall be closed by a watertight cover capable of withstanding a head of water to the top of the spurling pipes.

NOTE: Subclause b) is to prevent a head of water that may have built up within the spurling pipes from flooding the vessel through the underdeck access.

b)

6.16.2.2

Water ingress via the spurling pipes to be minimised Spurling pipes subject to the provisions in Clause 6.16.2.1 shall be provided with means to minimize water ingress; such as coamings and/or permanently attached closing appliances.

NOTE: Closing appliances are normally arranged to fit around the anchor cable with the anchor in its normal position housed and ready for deployment.

6.16.2.3

Drainage of anchor cable lockers Anchor cable lockers shall be arranged to be readily and efficiently drained either-- a) b) directly overboard, or

Note: Refer to Clauses 5.5 and 6.9 for provisions applicable to system discharges.

NSCV Part C ss5A 5.8.2.3

into an adjacent compartment by means of a self-closing valve or cock; but only if-- i) ii) iii) iv) v) the vessel has a measured length less than 35 metres, the anchor cable locker has a volume less than 7 per cent of the total under deck volume of the vessel the adjacent compartment itself is served by the bilge system; the valve or cock is fitted outside the anchor cable locker; and the valve or cock is operable from a readily accessible position.

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CHAPTER 7

7.1

USL Code 5A.4.17; 5A4.20

TESTS FOR WATERTIGHT AND WEATHERTIGHT INTEGRITY

SCOPE This Annex specifies tests to verify the watertight or weathertight integrity of structure or fittings for the purposes of this Section. APPLICATION The tests specified in this Clause apply to structure or fittings specified within this section as being watertight or weathertight. Specific Question for public comment #10. Are the tests for watertightness and weathertightness proposed in this Chapter sufficient, appropriate and/or practical? Background: Classification society rules appear to require comprehensive testing. The requirements are based on IMO / Classification society criteria and ISO 1221 Annex D cl D1

7.2

USL Code 5A.4.17; 5A4.20

7.3 7.3.1

MSC Meeting paper 86/23/13 Annex

HOSE TESTING General Subject to Clause 7.4, the tightness of structural items and components which contribute to the watertight or weathertight integrity of the hull shall be verified by hose testing. Testing shall be carried out at a maximum distance of 1.5 m with a hose pressure not less than 200 kPa. The nozzle diameter shall not to be less than 12 mm. The jet shall to be targeted directly onto the weld or seal being tested. The duration of hose testing shall be determined appropriate to the risks associated with water penetration. Watertight integrity For structures and fittings required to be watertight, the joint shall be exposed to a hose test in accordance with Test A, or where applicable, Test B as specified in Table 15. Where unacceptable leaks do occur, they shall be marked, repaired and retested until no water leakage is detected. Table 15 -- Tests for verifying watertight integrity

Test A Application All zones Procedure For a period not less than 3 minutes, the jet shall be directed at the joint at the most vulnerable orientation. Criteria A test that shows no leaks shall be deemed to verify watertight integrity. A test that, subject to the following exception, shows no leaks shall be deemed to verify watertight

7.3.2

Lloyds naval ships Vol1Pt6Ch 6cl.6.6.3 ISO 1221 Annex D cl D1 USL Code 5A.4.17(b)

B

Zones 3, 4, For a period not less than 3 minutes, the jet shall be directed at the joint at 5 and 6 the most vulnerable orientation.

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integrity. In the case of fittings, slight seepage (1) is acceptable. KEY: (1) The amount of seepage that is acceptable depends on the likelihood of exposure, the number and total length of leakage points, the likelihood of detection and the consequences of water entering the space. A teaspoon full of water (5 mL) in 3 minutes equates to 100 mL an hour or 2.4 L per day. A tablespoon full of water (15 mL) in 3 minutes equates to 300 mL an hour or 7.2 L per day. A cupful of water (250 mL) in 3 minutes equates to 5 L an hour or 120 L a day. A litre of water in 3 minutes equates to 20 L and hour or 480 L a day. A bucket of water (9 L) in 3 minutes equates to 180 L an hour or 4.32 t a day.

7.3.3

ISO 1221 Annex D cl D1

Weathertight integrity For structures and fittings required to be weathertight, a hose test shall be applied in accordance with Test C, or where applicable, Test D as specified in Table 16. Table 16 -- Tests for verifying weathertight integrity

Test C Application Procedure Criteria A test that shows an ability to resist the passage of water such that not more than 50 mL leaks past the joint shall be deemed to verify weathertight integrity. A test that shows an ability to resist the passage of water such that not more than 50 mL leaks past the joint shall be deemed to verify weathertight integrity.

Zones 3, 4, For a period not less than 3 minutes, the jet shall be directed at the joint at 5 and 6 the most vulnerable orientation.

D

Zones 4, 5 and 6

For a period not less than 3 minutes, the jet shall be directed at the joint-- a) at an angle of 45 degrees from the plane of the effective watertight boundary, bulkhead or deck; and b) at the most vulnerable orientation possible subject to a).

NOTE: The difference between the criterion of slight leakage from watertightness test in Table 15 and the 50 mL criterion in Table 16 is that the former takes into account the total quantity of water that could leak from all sources over time while the latter is per test; i.e., from one hose in 3 minutes.

7.4

Lloyds ship rules Pt1Ch3 cl2.2.2f) Lloyds inland waterways Pt3Ch1s.7 Tab1.7.1

ALTERNATIVES TO HOSE TESTING The following alternative methods may be applied to verify watertight or weathertight integrity: a) b) Chalk testing supplemented by dimensional measurements of seal compressing components (applies to hatch covers and doors); Leak testing of the boundary of compartments using air under pressure

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c) d)

Hydraulic testing of the boundary of a compartment using a head of water; or For fittings and structure forming the boundary of immersed portions of the hull, a careful examination of the interior of the hull with the vessel afloat.

If any of these tests are found satisfactory, then a hose-test is not required. 7.5

USL Code 5C.42.4 5D.27.3

PROTOTYPE TESTING In addition to the above tests that are to be done after installation; windows or side scuttles and other portlights shall be prototype tested in accordance with the a relevant standard when the design pressure in Clause A4.2 exceeds 38 kPa.

NOTES: 1. 2. 3. The prototype testing is intended to ensure that the fitting will maintain its watertight or weathertight integrity when exposed to the design loading. Relevant standards include Lloyds Rules, ISO Standard 1751 (for portlights), ISO Standard 3903 (for windows). Certification for the intended purpose by a recognized body will be accepted as satisfying this clause.

Drafting Note: The value of 38 kPa comes from the pressure for forward facing windows on a 30 m + in Operational Area B being 27.1 x 1.4 = 37.94 kPa. Thus only forward facing windows on Large Operational A vessels or patrol and rescue craft etc in Zone 3 would need to be prototype tested. Similarly, this value will avoid prototype testing of some side scuttles or portlights on small vessels in the majority of locations.

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CHAPTER 8

8.1

New

FREEBOARD AND BUOYANCY AT THE BOW

SCOPE This Chapter specifies the minimum requirements for freeboard and buoyancy at the bow on certain seagoing vessels of length 25 m and more. APPLICATION This Chapter applies to the following vessels-- a) b) Class 1C or 2C of measured length 25 m to less than 46.9 m; Class 3A, 3B or 3C of measured length 25m or more.

NOTE: This Chapter does not apply to vessels subject to ICLL (see Table 1).

8.2

New

8.3

New

OBJECTIVE The objective of this Chapter is to control the risks of large quantities of seawater coming over the bow of the vessel when in a seaway that can threaten the structural and/or watertight integrity of the vessel and expose persons to unacceptable levels of personal danger.

NOTE: Loss of structural and/or watertight integrity may cause the vessel to founder.

8.4

ICLL Reg 39

MINIMUM BOW HEIGHT A vessel within the application of Clause 8.2 shall be designed and constructed so that, for all intended conditions of loading in normal operation, the actual bow height shall not be less than that the minimum bow height determined as follows:

Fb

0.96 f oa 6075 2.08

Lm 100

1875

Lm 100

2

200

Lm 100

3

0.609 Cb1 1.603 Cwf

0.0129

Lm T

where Fb = the vertical distance at the fore part of the hull between the static waterline corresponding to the most unfavourable combination of trim and draft in normal operation and the top of the exposed deck at side, in mm

NOTE: Refer to Part B for definition of fore part of the hull.

foa = a factor for the Operational Area = 1 for Operational Area A or B = 0.75 for Operational Area C Lm = the measured length of the vessel, in metres T = The mean draft of the vessel corresponding to the most unfavourable combination of draft and trim in normal operation, in m

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Cb1 = a value based on the block coefficient of the vessel =

Lm B T

where

or 0.68, whichever is the greater

= the volume of displacement of the vessel at the condition corresponding to the most unfavourable combination of draft and trim, in m3 B = the vessel breadth, in m Cwf = the waterplane area coefficient forward of Lm/2 =

Awf ( Lm / 2) B

where Awf = the waterplane area forward of Lm/2 of the waterline corresponding to the most unfavourable combination of draft and trim, in m2 B = the vessel breadth, in m

LCF Lm

Cw

2.1

where Cw = the waterplane area coefficient of the waterline corresponding to the most unfavourable combination of draft and trim LCF = the longitudinal centre of flotation at that waterline measured from the midship location of Lm/2, in metres (+ve fwd) 8.5

ICLL Reg 39

LONGITUDINAL EXTENT OF BOW HEIGHT PROTECTION The protection provided by the minimum bow height specified in Clause 8.4 shall be carried aft in accordance with either of the following: a) Where the bow height at for forward end of the hull is obtained by sheer, the sheer shall extend for at least 15% of the length of the ship measured from the forward perpendicular. Where the bow height is obtained by fitting a forecastle, the forecastle shall-- i) ii) iii) extend from the stem to a point not less than 0.07Lm abaft the fore part of the hull, be enclosed to form part of the effective watertight envelope; and Have a sheer not exceeding that which would result in the aft end of the forecastle having a height above deck less than the minimum standard height specified for each reference level in Table 2.

b)

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CHAPTER 9

9.1

FREEBOARD MARK

APPLICATION Vessels of measured length 25 m or greater shall be provided with freeboard marks. The freeboard marks on vessels not required by Table 1 to comply with the ICLL shall be in accordance with this Chapter.

NOTE: Vessels required by Table 1 to comply with the ICLL will be marked with a statutory load line in accordance with the ICLL.

9.2

LOCATION The freeboard mark shall be located-- a) b) c) on each side of the vessel; amidships of the measured length (refer to NSCV Part B); and at the deepest loaded waterline (refer to Clause 3.4.2.1).

The location of the freeboard mark shall be established and documented relative to fixed structural components to facilitate marking and verification.

NOTES: 1. 2. Fixed structural components include frames and decks. Marking of a deck line may facilitate marking and verification of the freeboard mark (see ICLL for marking of a deck line)

9.3

MULTIPLE MODES OF OPERATION A vessel intended for alternating modes of operation having different locations for the deepest loaded waterline may have additional freeboard marks located to correspond with the critical operating condition for each mode.

9.4

MARKING The freeboard mark shall be marked in accordance with the following: a) b) c) d) The freeboard mark shall consist of a horizontal line 25 mm in breadth and 230 mm in length. The upper edge of the horizontal line shall be located to correspond to the the location of the deepest loaded waterline. The marks shall be identified with the letter N. If more than one freeboard mark is assigned to the vessel (see Clause 9.3), consecutive numbers shall be added beginning from the mark indicating the position of the deepest waterline assigned to the vessel; i.e., 'N1, N2, etc'. The freeboard mark and identifying letters (and where applicable numbers) shall be permanently marked and highlighted by painting in white or yellow on a dark background or in black on a light background.

NOTES:

e)

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1. 2. 3.

Permanent marking on steel or aluminium vessels is normally by welding of precut components, cutting-in or centre-punching. Permanent marking on wooden vessels is normally by cutting-in to a depth of 3 mm or more into the planking. Permanent marking on FRP vessels can be achieved by permanently glueing with structural adhesive pre-glassed coremat markings.

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CHAPTER 10 DRAINAGE OF WELLS AND COCKPITS

10.1 SCOPE This Chapter specifies minimum deemed-to-satisfy solutions for the drainage of wells and cockpits on vessels in Zones 3, 4, 5 and 6. 10.2 APPLICATION This Chapter applies to all vessels except for-- a) b) 10.3

New

vessels subject to the International Load Line Convention (see Table 1); and vessels that are open vessels.

OBJECTIVE The objective of this Chapter is to reduce to a minimum the duration that water from wave action or weather remains on the exposed decks of a vessel so as to-- a) b) avoid adverse effects on the vessel`s stability due to increased displacement and/or free surface effects; avoid the likelihood of water entering buoyant spaces through ventilators and/or the immersion of weathertight closing appliances; and reduce the exposure of persons to the personal risks associated with large quantities of water on deck.

c)

10.4

New

DEFINITIONS cockpit-- a recess that satisfies the application criteria specified in Clause 10.7.1. freeing port-- an opening to drain water on deck overboard provided in the boundary that forms a well or cockpit on the deck. recess-- a portion of deck bounded by solid bulwarks or other structures that is liable to the unwanted retention of water. scupper-- a pipe or other opening to drain water on deck overboard through a low point in the deck that forms the sole of the well or cockpit. well-- a recess bounded by solid bulwarks or other obstructions not being a cockpit.

10.5

USL 5C.67 5D.29

GENERAL REQUIREMENTS Exposed decks shall be provided with freeing ports or other arrangements for rapidly freeing the decks of water and for draining recesses.

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Drainage shall be located to be effective for all combinations of trim and heel likely during normal service. 10.6 10.6.1

USL 5C.67.9 5D.29.1

DRAINAGE OF WELLS Minimum drainage area The minimum drainage area on each side of the vessel for each well shall be that given by the following formula

ADW

where

1 0.07 fW f A f Z f dk lW hb .5

ADW = minimum required total area of freeing ports per side, in square metres fW = a factor depending upon the height of bulwark relative to the breadth of the vessel = 1 where the mean height of the solid bulwark in way of the well does not exceed 0.15 BW, where BW is the maximum width of the well

= 1.5 where the mean height of the solid bulwark in way of the well exceeds 0.15 BW, where BW is the maximum width of the well fA = a factor depending upon the Operational Area = 1 for Operational Areas A and B = 0.75 for Operational Area C = 0.5 for Operational Areas D and E fZ = a factor depending upon the location of the lowest point of the top rail of the solid bulwark in way of the well = 1 in Zone 3 = 0.5 in Zone 4 = 0.25 in Zone 5 or Zone 6 fdk = a factor depending upon the angle of the deck within the well = 0.85 if the deck within the well lies at a mean angle not less than 2.3 degrees (one in 25) to facilitate drainage (either camber or sheer) = 1 otherwise lW = the lesser value of-- a) length of well, in metres b) 0.7 Lm where Lm is the measured length of the vessel, in metres hb = mean height of bulwark at sides of the well, in metres Specific Question for public comment #11. Do you support the proposed formula for calculating drainage area of freeing ports?

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Drafting Note: A comparison of the requirements from Load Line and those for non-load line vessels in the USL Code showed major discrepencies between the required areas with variations as large as 900% for wells of relatively short length. The differences are wholly inconsistent with a performance-based approach. The proposal uses a more performance based approach that assumes-- a) b) c) the vessel heels to 15 degrees and any excess water in the well goes over the bulwark rail the remainder passes through the freeing ports and the quantity per metre length is independent of the size of vessel. The determination of freeing port area has been based on a performance requirement that the well will be 90% drained within 10 seconds.

A table comparing the outcomes of formula against the current USL Code is given below. While, the area on non-loadline vessels has been increased, this has been somewhat ameliorated by the factors for operational area fA, location fZ and deck angle fdk that reduce the required area. In any case, it should be noted that the SFV Code applicable to fishing vessels also requires larger area than the current USL Code for non-loadline vessels. While it is difficult to prove the current USL Code non-loadline freeing port areas are inadequate, the fact that fishing vessels in particular have had relatively high rates of foundering including capsize may be linked in part to an inadequacy in the arrangements to shed water from deck. The fW factor differentiates between a well that retains large quantities of water as the vessel heels and a well largely emptying at an angle of heel of 15 degrees from the upright in a manner similar to a shallow dish such that a) the quantity of water filling the deck would be less than or equal to 25 per cent of the nominal quantity with the vessel in an upright position; and the free surface of water filling the deck would be less than or equal to 12.5 per cent of the nominal free surface with the vessel in an upright position.

b)

The well with deep bulwarks would start to retain relatively large quantities of water past 15 degrees heel and so need to have enhanced arrangements for rapid drainage relative to the nominal volume. Comparison of proposed drainage formulas with current USL Code requirements

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Part C Section 2

fw 1 fa 1 fz 1 fdk 1 USLCode LL \\values assumes no sheer in deck USL LL calculation Bwk hgt hb Well lgth lw m m 0.6 2 0.6 5 0.6 10 0.6 20 0.6 30 0.8 2 0.8 5 0.8 10 0.8 20 0.8 30 1 2 1 5 1 10 1 20 1 30 1.2 2 1.2 5 1.2 10 1.2 20 1.2 30 1.4 2 1.4 5 1.4 10 1.4 20 1.4 30 USL LL m2 1.12 1.22 1.40 1.74 2.61 1.14 1.28 1.52 1.98 2.97 1.16 1.31 1.58 2.10 3.15 1.16 1.31 1.58 2.10 3.15 1.18 1.37 1.70 2.34 3.51 USL<12.5 USL>12.5 Proposal m2 m2 m2 0.02 0.04 0.07 0.06 0.09 0.16 0.12 0.19 0.33 0.37 0.65 0.56 0.98 0.03 0.06 0.10 0.08 0.15 0.25 0.16 0.30 0.50 0.61 1.00 0.91 1.50 0.04 0.09 0.14 0.10 0.23 0.35 0.20 0.45 0.70 0.90 1.40 1.35 2.10 0.05 0.12 0.18 0.12 0.31 0.46 0.24 0.62 0.92 1.25 1.84 1.87 2.76 0.06 0.17 0.23 0.14 0.41 0.58 0.28 0.83 1.16 1.65 2.32 2.48 3.48

10.6.2

USL 5C.67.4

Exclusions in way of a deckhouse or trunk Where a well located within the midship half length of the vessel contains a deckhouse or trunk, and the deckhouse or trunk is of width not less than 80 per cent of the breadth of the vessel, and the passageways so formed are each not greater than 1.5 metres in width, that portion of the vessel in way of the deckhouse or trunk may be excluded from calculation of the length of well. Where the deckhouse effectively splits what otherwise would be a single well, the remaining portions of the well shall be provided with drainage as two separate wells.

NOTE: The 80 per cent deck house width requirement is likely to be critical for vessels of breadth less than 15 metres, while the 1.5 metre requirement for passageways is likely to be the critical requirement for vessels of breadth over 15 metres.

Where a screen bulkhead is fitted that completely crosses the vessel at the forward end of deckhouse, then the requirement for the minimum width of deckhouse specified above need not apply.

NOTE: This removes the deck house width requirement which would otherwise be critical on vessels of breadth less than 15 metres. The 1.5 metre maximum width of passageways still applies.

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10.7 10.7.1

New

DRAINAGE OF COCKPITS Application For the purposes of the application of this Clause, a cockpit is a recess that meets either of the following criteria: a) The width of the recess shall not exceed 50 per cent of the vessel breadth B and the length of the recess shall not exceed 50 per cent of the measured length of the vessel Lm; or On vessels of measured length Lm less than 24 m having a width of recess exceeding 50 per cent of the vessel breadth B, the length of the recess shall not exceed the value specified in the Table 17.

b)

Table 17 -- Allowable length of recess for consideration as a cockpit on vessels of measured length less than 24 metres

Operational Area A and B C D and E Allowable length of recess as a percentage of the measured length Lm 10 per cent 25 per cent 50 per cent

10.7.2

USL 5C.67.7

Minimum drainage area The minimum area of drainage within a cockpit shall be that given by the greater value of--

ACD 2300 f A AC f F hC or

ACD

where

700 AC

ACD = minimum required total area of drainage, in square mm fA = a factor depending upon the Operational Area = 1 for Operational Areas A, B and C = 0.75 for Operational Area D and E AC = area in plan view of the cockpit, in m2 fF = a factor related to the percentage of total water capacity of the cockpit =

0 .6

2.4 FR Lm

FR = minimum freeboard to the lowest point of the cockpit coaming in the fully loaded condition, in metres Lm = measured length of the vessel, in metres.

where

hC = The distance from the lowest point of the cockpit floor to the lowest point of the cockpit coaming, in metres

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Specific Question for public comment #12. Do you support the proposed formula for calculating drainage area of cockpits? Specific Question for public comment #13. Should the current USL Code requirement apply as a minimum as shown, or should the minimum be altered to a minimum based on a minimum practical size of scupper? Background: The current USL Code does not clearly define when a vessel can use the scupper calculation for drainage of 700mm2 per 1m2 and when it cannot. The proposal modifies this to allow application on vessels with cockpits having dimensions such that the free surface arising from swamping would be limited. The formula for drainage is based on the the cockpit draining 90% of a specified flooded volume in 2.5 minutes for a seagoing vessel or in 3.33 minutes for a sheltered water vessel. The the volume is based on a formula provided in the ISO Code for small craft that takes into account freeboard relative to vessel length. The 90% in 2.5 minutes is in the same order of magnitude as the 3 minutes for drainage of RIBs having a freeboard to the deck of less than 150 mm. A value of 700mm2 per 1m2 is retained as the minimum requirement. A comparison is given below for vessels 5 m, 10 m and 15 m in length. It can be seen that for the majority of combinations of vessel length, freeboard, and cockpit height, the calculated drainage area for 90% drainage in the time Acd1 is smaller than the USL Code requirement. These have been marked in blue. There is potential to reduce the requirement in these cases. Where the proposal exceeds the USL Code, these have been marked in yellow. If a minimum practical size of scupper of 20 mm diameter were chosen, then this would equate to not less than 630 mm2 assuming one per side. Alternatively this would equate to a single scupper not less than 28 mm diameter, the larger diameter being justified by the lack of redundancy should it become blocked.

Lm 5 Ac 2 Freeboard factor Freeboard to sole m m2 0.01 0.05 length of vessel Cockpit area m USL Code 1400 1400 1400 1400 1400 1400 1400

Fa 1 1.00 1.00 1.00 1.00 0.75 0.75

Fr 0.25 0.45 0.65 0.85 1.05 0.25 0.45

ff 48.0% 38.4% 28.8% 19.2% 9.6% 48.0% 38.4%

hc 0.20 0.40 0.60 0.80 1.00 0.20 0.40

Acd1 987 1117 1026 790 442 741 838

Proposal 1400 1400 1400 1400 1400 1400 1400

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Fa 0.75 0.75 0.75

Fr 0.65 0.85 1.05

ff 28.8% 19.2% 9.6% m m2 0.01 0.1

hc 0.60 0.80 1.00

Acd1 770 592 331

USL Code 1400 1400 1400

Proposal 1400 1400 1400

Lm 10 Ac 5 Freeboard factor Freeboard to sole

length of vessel cockpit area m USL Code 3500 3500 3500 3500 3500 3500 3500 3500 3500 3500

Fa 1.00 1.00 1.00 1.00 1.00 0.75 0.75 0.75 0.75 0.75

Fr 0.3 0.5 0.7 0.9 1.1 0.3 0.5 0.7 0.9 1.1

ff 52.8% 48.0% 43.2% 38.4% 33.6% 52.8% 48.0% 43.2% 38.4% 33.6% m m2 0.01 0.15

hc 0.20 0.40 0.60 0.80 1.00 0.20 0.40 0.60 0.80 1.00

Acd1 2715 3491 3848 3950 3864 2037 2618 2886 2962 2898

Proposal 3500 3500 3848 3950 3864 3500 3500 3500 3500 3500

Lm 15 Ac 8 Freeboard factor Freeboard to sole

length of vessel cockpit area m USL Code 5600 5600 5600 5600 5600 5600 5600 5600 5600 5600

Fa 1.00 1.00 1.00 1.00 1.00 0.75 0.75 0.75 0.75 0.75

Fr 0.35 0.55 0.75 0.95 1.15 0.35 0.55 0.75 0.95 1.15

ff 54.4% 51.2% 48.0% 44.8% 41.6% 54.4% 51.2% 48.0% 44.8% 41.6%

hc 0.20 0.40 0.60 0.80 1.00 0.20 0.40 0.60 0.80 1.00

Acd1 4476 5958 6841 7373 7654 3357 4469 5131 5530 5741

Proposal 5600 5958 6841 7373 7654 5600 5600 5600 5600 5741

10.8 10.8.1

ICLL Reg.24(4)

OPEN STRUCTURES THAT FORM RECESSES Application Superstructures and deckhouses that do not comply with the provisions for weathertight integrity in Chapter 6 shall be considered to be open for the purposes of this Clause. Open superstructures and other large spaces A superstructure or other space exceeding 50 per cent of the breadth of the vessel, having the whole or a portion of one or both end bulkhead open

10.8.2

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shall be considered as a well with drainage determined in accordance with Clause 10.6.1, modified as follows: a) b) The length of well lW shall be the combined width of all openings in the end bulkheads. The height of bulwark hb shall be the mean value of the mean height of bulwarks in wells adjacent to the superstructure openings; with a minimum value of 0.9 metres.

NOTE: No deemed-to-satisfy solution is specified for openings in side bulkheads.

10.8.3

USL 5D.30

Open spaces considered as cockpits Smaller spaces with open bulkheads that in dimension qualify as cockpits in Clause 10.7 shall be provided with drainage of area as specified in Clause 10.7 assuming the following: a) b) c) The cockpit area AC shall be the entire deck area of the space considered open, in m2; The factor fF shall be 1; and The distance hC shall be the height of the lowest door sill accessing the space from the open deck, in m.

10.8.4

Spaces with weathertight closing appliances not complying with Chapter 6 Spaces that do not lead directly to spaces located below the freeboard datum, and which are enclosed by weathertight closing appliances that do not meet the requirements for sill height, coaming height, etc shall be provided with drainage of area as specified in Clause 10.7 assuming the following: a) b) c) The cockpit area AC shall be the entire deck area of the space considered open, in m2; The factor fF shall be 1; and The distance hC shall be not less than 0.1 m.

USL 5D.30

10.9 10.9.1

USL 5C67.6 5C67.10

DESIGN OF DRAINAGE ARRANGEMENTS General provisions Drainage arrangements shall be located so as to remain effective over the expected range of trim in normal operation, and at the same time when the vessel is heeled 5 degrees to port or 5 degrees to starboard. The discharge area attributed to a an arrangement for drainage shall be determined as a net value after deducting the shielding effect of any grills or gratings, non-return valves or other obstructions. Drainage arrangements that discharge directly through bulwarks in Zone 2 shall be provided with non-return devices to prevent the build-up of water on decks during normal operation.

EXAMPLES:

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Hinged rubber shutters on freeing ports Ball non-returns on scuppers 10.9.2

USL 5C.67 5D.29

Freeing ports In addition to complying with the general provisions for drainage specified in Clause 10.9.1, freeing ports, where fitted, shall comply with the following requirements: a) b) c) The lower edges of freeing ports shall be as near the deck as practicable. The minimum drainage area specified in Clause 10.8.2 shall be located not greater than 40% of the height of the bulwark above deck. In wells where the deck is arranged with sheer-- i) ii) d) e) two-thirds of the freeing port area required shall be provided in the half of the well nearest the lowest point of sheer; and the remaining one third of the freeing port area shall be evenly spread along the remaining length of the well.

In wells where the deck has zero or little sheer; the freeing port area shall be evenly spread along the length of the well. Openings for freeing port in the bulwarks shall be protected by rails or bars spaced not greater than 230 mm apart.

NOTE: The profile area of rails or bars reduces the clear area of the freeing port and does not count towards achieving the required area.

f)

Where shutters are fitted to freeing ports; arrangements shall be provided to ensure that the shutters do not impede the operation of the freeing port. In particular-- i) ii) iii) ample clearance shall be provided to prevent jamming; hinges shall have pins or bearings of non-corrodible material; and shutters shall not be fitted with securing appliances.

NOTE: A proposal for securing freeing port shutters such as during fishing operations on fishing vessels would need to be assessed as a proposal for an equivalent solution taking into account, amongst other factors, the ease by which the securing mechanism can be released from a readily accessible position.

g)

On fishing vessels, poundboards and means for stowage of the fishing gear shall be arranged so that the effectiveness of freeing ports will not be impaired. Poundboards shall be so constructed that they can be locked in position when in use and shall not hamper the discharge of shipped water.

10.9.3

USL 5C67.6

Scuppers In addition to complying with the general provisions for drainage specified in Clause 10.9.1, scuppers, where fitted, shall comply with the following requirements: a) b) Scuppers serving a space shall be arranged so as to be self-draining. Scuppers that pass through the effective watertight envelope shall comply with Clauses 5.5 or 6.9.

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ANNEX A

PORTLIGHT, SIDE SCUTTLE AND WINDOW PANES AND WINDOW FRAMES

A1

USL Code 5C.73 5D.35

SCOPE This Annex specifies minimum requirements for panes in windows and portlights including side scuttles for the following applications:

;

a) b)

Portlights including side scuttles and windows protecting openings in the effective watertight envelope; Framed windows and portlights including side scuttles fitted to structures not forming the effective weathertight envelope but which, if they allowed the passage of water, would result in either-- i) ii) water entering openings leading down to the buoyant volume; or recesses which are not drained in accordance with Chapter 9 of this Section;

c)

Framed windows which are subject to human impact considerations.

NOTES: 1. A proposal for unframed windows, doors, etc. would need to be considered as a proposal for an equivalent solution, to be assessed taking into account relevant provisions of AS 1288 ­ Glass in buildings--Selection and installation Additional requirements for light transmission and field of vision from the operating compartment are specified in NSCV Part C Section 1. The term framed windows includes windows glued on a frame structure, see Clause A6.3.

2. 3.

A2

USL Code 5C.73 5D.35

APPLICATION Subject to alternative deemed-to-satisfy provisions contained within this standard, this Annex is normative for the following vessels:

;

a) b)

Seagoing vessels (Operational Areas A, B or C) of measured length less than 46.9 m; Sheltered waters vessels (Operational Areas D or E) of all lengths.

A3

SSAC Proposal by Qld 1997

MATERIALS Panes of windows and portlights including side scuttles shall be-- a) b) c) toughened safety glass; laminated safety glass; or polycarbonate material.

NOTE: Plate glass or acrylic material is not deemed-to-satisfy due to splintering effects when broken.

Specific Question for public comment #14. Should the clause provide for the use of clear acrylic sheet (PMMA) otherwise known as Perspex or Plexiglass?

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Background: The current USL Code does not accommodate PMMA material. The Queensland 1997 SSAC proposal did not accommodate this material. However Lloyds SSC Rules provides for acrylic in Section 7 Clause 7.11.1. The material is often used on smaller yachts.

DnV HS&LC Pt3Ch6S1 G103

Panes of windows used for navigation from the operating position shall be of glass.

NOTES: 1. 2. Refer to Part C Section 1 for additional requirements for windows used for navigation. Polycarbonate material is vulnerable to scratching and optical deterioration over time.

A4 A4.1

SSAC Proposal by Qld 1997

PANE THICKNESS Minimum nominal thickness The minimum nominal thickness of the material forming the pane of a window or portlights shall not be less than the greatest of the values specified in Clauses A4.3 for strength, A4.4 for deflection and A4.5 for robustness. The minimum requirement for sliding windows that are supported on three sides when closed shall be determined in accordance with the specific provisions for panes supported on three sides only contained in Clauses A4.3 and A4.5.

A4.2

Modified USL Code 5C.73 ; 5D.35 see drafting note in Error! Reference source not found.

Assumed pressure The assumed pressure for calculating the thickness and deflection of panes shall be determined as follows:

PAs f L fOA fOR PN

where PAs = assumed pressure for the calculation of pane thickness, in kPa fL = a factor depending upon the measured length of the vessel = 1 for vessels of measured length 30 m or more = 0.4 for vessels of measured length 10 m or less = 0.4 + 0.03 x (Lm-10) for vessels of measured length Lm less than 30 m and greater than 10 m fOA = a factor depending upon the vessel`s Operational Area = 1.2 for vessels in-- a) operational Area A; or b) vessels operating in Operational Areas B or C and engaged in patrol, rescue or pilot activites = 1.0 for Operational Area B except patrol, rescue or pilot work = 0.85 for Operational Area C except patrol, rescue of pilot work = 0.75 for Operational Area D

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= 0.60 for Operational Area E fOR = a factor depending upon the orientation of the window pane relative to the vessel = 1.4 for forward facing windows = 1.0 for side or aft facing windows = 1.0 for portlights including side scuttles regardless of orientation PN = Nominal design pressure from Table A.1, in kPa Table A.1--Nominal design pressure for windows and portlights including side scuttles

Zone Nominal design pressure for side scuttles and portlights kPa Zone 2 Zone 3 Zone 4 Zone 5 or 6 285 132 69 27.1 Nominal design pressure for windows kPa Not DtS 27.1 13.8 11.2

A4.3

SSAC Proposal by Qld 1997

Minimum thickness for strength The minimum pane thickness of windows or portlights including side scuttles shall be determined as follows--

t str PAs b 2

where tstr = the minimum required thickness of pane for strength, in mm PAs = the assumed pressure for the calculation of pane thickness from Clause A4.2, in kPa b = a non-dimensional coefficient as specifed in Table A.2 (or Table A.3 for sliding opening windows) = For panes supported on all four edges: the length of the shorter dimension of the pane, in mm = For panes supported only on three edges as on sliding opening windows: the length of the unsupported dimension of the pane, in mm = the allowable working stress of the pane material from Table A.4, in kPa

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Table A.2 ­ Values for and for aspect ratio b/a (pane supported on all four edges)

Value of b/a where b = short dimension of unsupported pane and a = long dimension Shape Rectangular (including square Elliptical (including round) 1.0 0.287 0.044 0.315 0.047 0.9 0.330 0.053 0.355 0.057 0.8 0.393 0.065 0.400 0.067 0.7 0.478 0.079 0.445 0.077 0.6 0.545 0.096 0.485 0.087 0.5 0.612 0.111 0.530 0.970 0.4 0.668 0.123 0.577 0.107 0.3 0.704 0.131 0.620 0.117 0.2 0.730 0.137 0.668 0.126 0.1 0.745 0.141 0.715 0.136 0 0.750 0.142 0.750 0.146

Table A.3 ­ Values for and for aspect ratio a/b (pane supported on three edges only)

Value of a/b where a = length in direction where two edges are supported and b = length in direction having the unsupported edge 0.5 0.360 0.080 0.6 0.410 0.096 0.7 0.469 0.110 0.8 0.538 0.122 0.9 0.609 0.132 1 0.670 0.140 1.2 0.741 0.151 1.4 0.766 0.158 1.6 0.774 0.162 1.8 0.782 0.164 2 0.790 0.165 4 0.800 0.167

Table A.4 ­ Allowable Working Stress ( ) and Young's Modulus (E)

Material Laminated float glass Toughened glass Polycarbonate Working Stress (kPa) 27.6 x 10 58 x 10 26 x 10

3 3 3

Young's Modulus (kPa) 69 x 10 69 x 10

6 6 6

2.4 x 10

A4.4

SSAC Proposal by Qld 1997

Minimum thickness for deflection The pane thickness of windows shall not be less than the minimum thickness specified by the following formula--

tdef

3

Rd

PAs b 3 E

where tdef = the minimum required thickness of the pane material for deflection, in mm Rd = the deflection ratio (being the ratio of the length of the short dimension b of the window divided by the deflection) = 100 for panes of glass material = 100 for panes of polycarbonate material considered to be of robust construction = 50 for panes of polycarbonate material otherwise

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E

= the Young`s Modulus of the pane material as specified in Table A.4, in kPa

PAs = the assumed pressure for the calculation of pane thickness from Clause A4.2, in kPa b = a non-dimensional coefficient as specifed in Table A.2 (or Table A.3 for sliding opening windows) = For panes supported on all four edges: the length of the shorter dimension of the pane, in mm = For panes supported only on three edges as on sliding opening windows: the length of the unsupported dimension of the pane, in mm A4.5 A4.5.1 Minimum thickness for robustness Wave or motion induced object impact (toughened glass materials only) The nominal pane thickness of panes in portlights, including side scuttles, and toughened glass panes only in windows shall not be less than the values specified in Table A.5. Table A.5 ­ Minimum thickness of toughened glass panes (mm) for robustness against object impact

Portlights including side scuttles-- any material (mm) Location Zone 2 Zone 3 Seagoing 10 8 Sheltered 10 8 Windows--toughened glass material only (mm) Seagoing Not DtS 6 Sheltered Not DtS 5

SSAC Proposal by Qld 1997 Also DnV HS&LC Pt3Ch6S1 G202 Also ISO 1751 Table 5 Also ABS Guide HSC Table 3/20.1

Zone 4 Zones 5 & 6 KEY: (A) Applies if-- 1. 2.

6 6(A)

6 Not specified

6 6(A)

5 Not specified

enclosing a space containing equipment essential for safety (e.g. the operating compartment); or enclosing a space with openings through decks leading directly into spaces forming the buoyant volume.

A4.5.2

AS1288 Table 5.1

Human impact safety requirements (glass materials only) Where glass is likely to be subjected to human impact, it shall comply with the maximum permissible area requirements for Grade A safety glazing material specified in Table A.6.

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Table A.6 ­ Maximum permissible area for different thicknesses of Grade A safety glazing material for human impact safety (1)

Laminated float glass Nominal pane thickness mm Maximum permissible unsupported area (2) 2 m Seagoing or > 15 knots 1.4 2.1 3.5 Sheltered and < 15 knots 2.0 3.0 5.0 Toughened glass Nominal pane thickness mm Maximum permissible unsupported area (2) 2 m Seagoing or > 15 knots 0.7 1.4 2.1 Sheltered and < 15 knots 1.0 2.0 3.0

5.38 6.38 8.38

3 4 5

10.38 12.38 KEY:

4.9 6.3

7.0 9.0 (3)

6 8

2.8 4.2

4.0 6.0

(1) Adapted from AS 1288 (2) Mullions only direction provide support in one

10 12

5.6 7.0

8.0 10.0 (3)

(3) Panes of this area may not be readily available

A5 A5.1

SSAC Proposal by Qld 1997

FRAMES AND SUPPORTING STRUCTURE General requirements Frames and supporting structure shall be designed so that, when subject to wind or water, they-- a) b) c) d) distribute the loads from the pane through the points of contact into the supporting structure; avoid point loading of the pane such as might arise through direct contact between any metal and glass components; prevent panes from popping out due to deflection; and provide a watertight or weathertight seal as applicable.

A5.2

DnV HS&LC Pt3Ch6S1 G102

Rubber or synthetic rubber mouldings Rubber or synthetic rubber mouldings used to support panes in their frame shall be limited to-- a) b) windows in Zones 4 to 6 on vessels of Operational Area C; or windows in Zones 3 to 6 on vessels of Operational Areas D or E.

Where such mouldings are used, the cross section of the moulding shall be designed so as to increase the grip on the pane as the lateral pressure from outside is increased.

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NOTE: Clause A5.1c above frequently limits the size of windows that can be fitted in rubber or synthetic rubber mouldings.

A5.3

SSAC Proposal by Qld 1997

Support afforded by frames The support to be afforded in the frames shall not be less than-- a) b) 1.5 times the thickness of the pane for panes of glass material; or 4 times the required thickness the pane for panes of polycarbonate material.

Sufficient edge clearance shall be provided to prevent direct contact between the pane material and hard materials forming the frame.

NOTE: The edge clearance is typically not less than one half the thickness of the glass.

A5.4

Frame and mullion maximum allowable deflection (applicable to glass materials only) When completely assembled and glazed, the structural member forming the frame that supports the edge of the pane or mullion that supports the centre of the pane shall, when subject to loading from the glass under the assumed pressure PAs in Clause A4.2, have a ratio of member span to deflection not less than 150. INSTALLATION Mineral glass Toughened glass having chipped edges or surface damage shall not be used. Windows shall be mounted using suitable resilient gaskets of neoprene rubber or synthetic compounds. Polycarbonate Allowance shall be made for the high thermal expansion of polycarbonate panes relative to the frame which may lead to cracking around bolted connections.

AS1288 Cl..3.2.1

A6 A6.1

SSAC Proposal by Qld 1997

A6.2

Sika website

An expansion gap of at least 5 mm all round shall be incorporated between the window rebate and the polycarbonate pane to accommodate thermal movement. Holes for fixing screws shall be drilled oversize, i.e. larger than the actual diameter of the screw shank. To minimise the risk of stress cracking, flat sheets of polycarbonate glazing material shall not be forced to take up a curvature by the use of mechanical fastenings.

NOTE: Stress in curved glazing panels is avoided by having such panels prefabricated to order and properly tempered.

Sealing compounds shall be suitably protected from ultra violet light.

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A6.3 A6.3.1

DnV HS&LC Rules Pt3Ch6 G300

Glued windows General Windows may be secured to the supporting structure by glue joints without any counter frame or mechanical fasteners subject to compliance with the provisions of Clause A6.3. Glued joints

A6.3.2

A.6.3.2.1 Suitability for purpose The resistance and long-term behaviour of the glue used for affixing window panes shall be appropriate for the intended service and application. A.6.3.2.2 Minimum properties of adhesives

DnV HS&LC Rules Pt3Ch6 G300

Adhesives used for structural glazing shall comply with the following minimum requirements when tested in accordance with ISO 8339: a) b) c) Minimum tensile strength: 0,70 MPa Tensile stress: not less than 0,14 MPa at 12,5 % elongation Minimum fracture elongation: 50 % cohesive fracture

A.6.3.2.3 Stability of glued joints

DnV HS&LC Rules Pt3Ch6 G300

The following characteristics shall be established and documented: a) b) c) d) Resistance to the effects of UV-light*; Effects of high and low temperatures*, Effects of cleaning chemicals*; The long time behaviour of the glue with respect to-- i) ii) retention of adhesive and cohesive strength and elasticity; and creep properties.

NOTE: *Alternatively, the glue joint can be protected against such effects.

In addition, the short and long term performance of the adhesion between glue and particular substrate material shall be established and documented. A6.3.3

DnV HS&LC Rules Pt3Ch6 G300

Support The weight of window panes shall be carried by not less than two support blocks along the lower edge. Joint dimensions

A6.3.4

A.6.3.4.1 Joint width

DnV HS&LC Rules Pt3Ch6 G300

The joint width wgw in mm shall not to be less than the greater value of:

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b Pw 2000

or 0.02b

tg

where b = the length of the shorter dimension of the pane, in mm = where V = the speed of the vessel, in knots tg = The allowable tensile stress for the glue, in MPa (normally to be taken as the stress at 12.5 per cent elongation) A.6.3.4.2 Joint thickness of glue

DnV HS&LC Rules Pt3Ch6 G300

PW = the wind suction load, in kPa

0.00125 (50 0.5V ) 2

The joint thickness tgw in mm shall not to be less than the greater value of:

kw a1 or 6 mm 1000

If wgw > 12, the joint thickness tgw in mm shall not to be less than the lesser value of:

wgw kw a1 or mm 2 1000

where kw = 1.5 for glass = 8.0 for polycarbonate a1 = if a/b 2, then a, in mm = if a/b > 2, then 2b, in mm where a b = the length of the longer dimension of the pane, in mm = the length of the shorter dimension of the pane, in mm

wgw = The joint width calculated in accordance with Clause A.6.3.4.1, in mm A6.3.5 Quality of installation

A.6.3.5.1 Procedure

DnV HS&LC Rules Pt3Ch6 G300

The installation of glued windows shall be carried out in accordance with the glue manufacturer`s instructions and specifications. Procedures shall be documented and shall cover the following: a) b) environmental conditions surface preparation

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National Standard for Commercial Vessels

Part C Section

c) d) e)

glue application curing time or conditions inspection and testing.

A.6.3.5.2 Competence Only persons competent in the glueing of windows shall undertake the work.

NOTE: Accreditation by the glue manufacturer of a person in the use of a specific product for this purpose would provide evidence of competence.

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