Comparison of GRP Pipes with other Piping Materials
Description | GRP 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 |