Read Pipeline Analysis - MM-I07 to MM-J09.xls text version

Project Title Qatar Petroleum Offshore Engineering Department Project Technical Services Civil Structures and Pipelines Vortex Shedding Analysis Case Study 6" Oil Pipeline from Platform-A to Platform-B

"Offshore Pipelines Premise" software by Jassim Alhor Prepared: Jassim Alhor Date: 12/01/06 Rev: 1

Green fields are user input, while red fields are calculated values & gray fields need not to be entered User Input Description Nominal outer diameter Selected wall thickness Corrosion coating thickness Insulation coating thickness Concrete coating thickness Marine growth thickness Corrosion allowance Water absorption allowance Design pressure Absolute minimum water depth Density of content (minimum) Residual laying tension Umbilical submerged unit weight Ambient temperature Internal/Design temperature Maximum Wave Period Moment of inertia of concrete Wave Data (using PlusOne) Current velocity Wave induced velocity Boundary condition Pinned-Pinned Pinned-Fixed Fixed-Fixed Design Basis Description Outer diameter Calculated wall thickness Inner diameter Thickness of corr.+ins. coating Inside pipe cross sectional area Pipe steel cross sectional area Coefficient of inertia Gap between pipe & seabed Calculated wall thickness Added mass coefficient Temperature difference Modulus of elasticity Poisson's ratio Thermal expansion coefficient Acceleration due to gravity External pressure Design pressure Symbol Operation(C) 168.3 9.7 148.9 5 17413.2 4833.1 3.29 500.0 3.0 1.00 45.0 2.07E+11 0.3 0.0000117 9.807 3.0 137.0 Installation(UC) 168.3 12.7 142.9 5 16038.2 6208.2 3.29 500.0 3.0 1.00 0.0 2.07E+11 0.3 0.0000117 9.807 3.0 -3.0 Hydrotest(UC) 168.3 12.7 142.9 5 16038.2 6208.2 3.29 500.0 3.0 1.00 20.0 2.07E+11 0.3 0.0000117 9.807 3.0 172.0 Units mm mm mm mm mm2 mm2 mm o C N/m2 1/oC m/s2 bar bar Yes Yes Yes Symbol Operation(C) 6 12.7 5 0 30 0 3 5 140.0 30.0 500 0.0 0 15.0 60.0 10.00 77931818 0.4400000 0.8300000 Installation(UC) 6 12.7 5 0 30 0 0 5 0.0 30.0 0 0.0 0 15.0 15.0 0.00 77931818 0.4400000 0.0100000 Hydrotest(UC) 6 12.7 5 0 30 0 0 5 175.0 30.0 1027 0.0 0 15.0 35.0 0.00 77931818 0.4400000 0.0100000 Units in mm mm mm mm mm mm % bar m kg/m3 N kg/m o C

o

Do t tC t ins t con t mg t corr

a

Pi h min

content

SR We Tw T T Ic UC Uw

C

s mm4 m/s m/s

Do t Di t eq Ai As CI e e/D o Ca T

E

v

g Pe Pi

Mass Calculations Description Density of steel Density of corrosion coating Density of insulation coating Equivelant density of corr.+ins. Density of concrete coating Density of marine growth Density of water Mass of steel Mass of corrosion + insulation Mass of concrete coating Mass of marine growth Mass of content Added mass Pipe overall diameter Effective mass of pipe Buoyancy force Concrete Stiffness Calculations Description Moment of inertia of steel Coating factor Concrete strength Concrete modulus of elasticity Moment of inertia of concrete Stiffness ratio Concrete stiffness factor Design Factors Calculations Description Flow velocity Flow velocity ratio Keulegan Carpenter number Coefficient of drag Reynold number Boundary condition C1 C2 C3 Logarithmic decrement Static deflection (4D max) Hydrodynamic damping Structural damping Soil damping Restrained section Unrestrained section Total damping ratio Restrained section Unrestrained section Span length over diameter ratio Restrained section Unrestrained section Effective span length Restrained section Unrestrained section L eff L eff 8.00 11.00

NOT APPLICABLE

Symbol

Operation(C) 7850 1400 800 1400 3192 1027 1027 37.940 3.811 62.665 0.000 8.707 45.805 0.2383 158.927 45.805 Operation(C) 0.00001525 0.33 30.68 2.79E+10 0.00007793 0.6893 0.250 Operation(C) 1.270 0.346 82 0.650 2.004E+05 Pinned-Fixed 2.57 0.63 0.50 0.188 0.0 0.00 0.015 0.015 0.015 0.030 0.030 34 46

Installation(UC) 7850 1400 800 1400 3192 1027 1027 48.734 3.811 62.665 0.000 0.000 45.805 0.2383 161.014 45.805 Installation(UC) 0.00001891 0.33 30.68 2.79E+10 0.00007793 0.5559 0.212 Installation(UC) 0.450 0.978 0 #DIV/0! 7.102E+04 Pinned-Fixed 2.57 0.63 0.50 0.188 0.0 0.00 0.015

Hydrotest(UC) 7850 1400 800 1400 3192 1027 1027 48.734 3.811 62.665 0.000 16.471 45.805 0.2383 177.486 45.805 Hydrotest(UC) 0.00001891 0.33 30.68 2.79E+10 0.00007793 0.5559 0.212 Hydrotest(UC) 0.450 0.978 0 #DIV/0! 7.102E+04 Pinned-Fixed 2.57 0.63 0.50 0.188 0.0 0.00 0.015 0.015 0.015 0.030 0.030 50 80 12.00 19.00

S corr ins eq con mg w

MS M eq M con M mg M content M add D eff M eff F Symbol

Units kg/m3 kg/m3 kg/m3 kg/m3 kg/m3 kg/m3 kg/m3 kg/m kg/m kg/m kg/m kg/m kg/m m kg/m kg/m Units m4 N/mm2 N/m2 m4 Units m/s m m

Is kc f cn Ec Ic E c I c /E s I s

CSF Symbol V

KC

CD

Re

s hyd str soil soil T T

L/D eff L/D eff

NOT APPLICABLE

0.015

NOT APPLICABLE

0.030

NOT APPLICABLE

80

19.00

Forces & Loads Calculations Description Euler critical buckling load Restrained section Unrestrained section Effective axial force Restrained section S eff S eff Unrestrained section Allowable Dynamic Spans (related to velocities) -622146 0

NOT APPLICABLE

Symbol PE PE

Operation(C) 608476 321838

Installation(UC)

NOT APPLICABLE

Hydrotest(UC) 325351 129780 -411040 0 0

Units N N N N

129780

Operation (Corroded) Span Length Restrained section Unrestrained section

Installation (Uncorroded)

NOT APPLICABLE

Hydrotest (Uncorroded) 12.00 19.00 m m

L L

8.00 11.00

19.00

Validity Check based on DNV Classification Notes No. 30.5 Description Stability parameter Restrained section Unrestrained section Critical velocity Restrained section Unrestrained section Natural frequency Restrained section Unrestrained section Reduced velocity Restrained section Unrestrained section Vr Vr 1.405 1.596

NOT APPLICABLE

Operation(C) Ks Ks V cr V cr Fn Fn 1.027 1.027 1.627 1.627 3.794 3.340

Installation(UC)

NOT APPLICABLE

Hydrotest(UC) 1.147 1.147 1.747 1.747 1.336 1.162 1.413 1.625

Units 1/m 1/m -

1.041

NOT APPLICABLE

1.641

NOT APPLICABLE

1.220

1.548

Reduced Velocity V r < Critical Velocity V cr Restrained section Unrestrained section Satisfied Satisfied

NOT APPLICABLE

Satisfied Satisfied

Satisfied

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