GRP Pipes Vs Piping Materials

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

Comparison of GRP Pipes with other Piping Materials

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