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COMPARISON OF GRP PIPES WITH DI, MS Epoxy Coated, PVC & HDPE PIPES

SI No Description GRP Pipes DI Very poor corrosion resistance. Hence inside cement lining is required. For outside corrosion protection wrapping, coating, Cathodic protection is required External coating may peel off in due course of time due to rough handling and environment Periodical maintenance is required. Due to corrosion the life of pipe is 15 ­ 20 years MS Epoxy Coated To avoid inside corrosion, additional epoxy coating is required. For outside corrosion protection wrapping, coating, Cathodic protection is required External coating may peel off in due course of time due to rough handling and environment Periodical maintenance is required. Due to corrosion the life of the pipe is 10 ­ 15 years PVC HDPE

1.

Corrosion resistance

Good

Poor against alkali medium

Good

2.

Maintenance

Less Maintenance is required

Repair is not possible

Repair is not possible

3.

Life

GRP pipes are designed for 50 Years of life Best design optimization possible between meeting internal pressure class and stiffness requirement with fiber orientation and sand aggregate addition

Life of PVC pipe is 5 ­ 8 years depend upon the service condition

Life of HDPE pipe is 5 ­ 6 years depend upon the service condition

4.

Underground Application

The life of the under ground DI pipe is reduced due to external corrosion

The life of the under ground pipe is reduced due to external corrosion

Not suitable for Underground application

Uneconomical design calling for very high thickness.

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SI No 5.

Description Inside smoothness

GRP Pipes Hazen William Co-efficient (:C" Value ) = 150 Hence less pumping cost Optimised design depending upon operating condition 1.8 ­ 1.9

DI "C" value = 120 Hence pumping cost is higher

MS Epoxy coated C" value = 120 Hence pumping cost is higher Up to 400 NB ­ Standard size Above 400NB design includes corrosion allowance 7.85 4 times higher than GRP Difficult, due to heavy weight For a particular pressure rating, wall thickness is higher than GRP Min 400 MPa 210 ­ 240 GPa Plain steel pipes on par with GRP Epoxy coating extra

PVC C" value = 150

HDPE C" value = 150

6.

Design

Standard size

Standard size

Standard size

7.

Specific Gravity Weight

7.05 4 times higher than GRP Difficult, due to heavy weight For a particular pressure rating, wall thickness is higher than GRP Min 420 MPa 150 ­ 170 GPa 15% higher than GRP

1.4 ­ 1.45 Weight is higher than GRP due to higher wall thickness Handling is very easy For a particular pressure rating, wall thickness is higher than GRP 50 Mpa 3 GPa Higher for 300 NB and above sizes

0.95 Weight is higher than GRP due to higher wall thickness Handling is very easy For a particular pressure rating, wall thickness is higher than GRP 35 Mpa 5 Gpa Higher for 150 NB and above sizes

8.

Light in weight Handling is very easy since very light in weight Lesser wall thickness due to proper fiber orientation Hoop tensile strength = 375 Mpa Hoop Tensile modulus = 35 GPa -

9.

Handling

10.

Wall Thickness

Tensile strength Modulus of 12. elasticity 11. 13. Cost

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