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Comparison of GRP Pipes with other Piping Materials

 

DescriptionGRP Pipes
DI
Epoxy Coated
HDPE
Corrosion Resistance
Good
Very poor corrosion resistance. Hence inside cement lining and outside wrapping / coating is required
Very poor corrosion resistance Cathodic protection is required
Good
Inside Smoothness
Hazen William Co-efficient (C" Value)=150. Hence less pumping cost
"C" value =120 Hence Pumping cost is higher
"C" value =120 Hence Pumping cost is higher
"C" value = 150
Weight
Light in weight
4 times higher than GRP
4 times higher than GRP
Weight is higher than GRP due to higher wall thickness
Life
GRP pipes are designed for 50 years of life
Due to corrosion the life of pipe is 15-20 years
Due to corrosion the life of pipe is 10-15 years
Life of HDPE pipe is 10 -15 years depend upon the service
Handling
Handling is very easy since very light in weight
Difficult, due to heavy weight
Difficult, due to heavy weight
Handling is very easy
Underground Application
Best design optimization possible with 50 years life
The life of the under ground DI pipe is reduced due to external corrosion
The life of the under ground DI pipe is reduced due to external corrosion
Uneconomical design calling for very high thickness
Maintainace
Less Maintainance is required
External coating may peel off in due course of time. Periodical maintainace is required.
External coating may peel off in due course of time. Periodical maintainace is required.
Repair is not possible
Specific Gravity
1.8 -1.9
7.05
7.85
0.95
Tensile Strength
375 MPa (Hoop)
420 MPa
400MPa
35 MPa
Modulus of Elasticity
30GPa(Hoop)
150-170 GPa
210 -240 GPa
5GPa
Cost
Initial & Life-Cycle cost benefits
10% - 20% higher than GRP
10% - 20% higher than GRP
Higher for 150 NB and above sizes
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