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comparison of grp pipes with ductile iron

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Comparison of GRP Pipes with Ductile Iron, Mild Steel & Hdpe Pipes Sr No . Properties GRP Pipes Ductile Iron Mild Steel HDPE 1. Corrosion Resistance High against all kind of fluids Moderate with internal mortar lining External wrapping and Cathodic Protection required Satisfactory 2. Maintenance Minimum mainten- ance required Periodic inspection required Periodic inspection required Repair not possible 3. Design Life 50 years 30 years 30 years 50 years 4. Friction Factor(Hazen Williams Coefficient “c” Value) 150 140 140 150 5. Thickness Optimized by Design Standard Dimensions Optimized by Design Standard Dimensions 6. Surge Pressure Best in handling surgepressu res Protection device needed Protection device needed Reasonably good 7. Weight Light Weight 5-6 times heavier than GRP 3-4 times heavier than GRP Weight is higher than GRP due to higher thickness

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GRP & DI

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Comparison of GRP Pipes with Ductile Iron, Mild Steel & Hdpe PipesSr No.PropertiesGRP PipesDuctile IronMild SteelHDPE

1.Corrosion ResistanceHigh against all kindof fluidsModerate with internal mortar liningExternal wrapping and Cathodic Protection requiredSatisfactory

2.MaintenanceMinimum mainten-ance requiredPeriodic inspection requiredPeriodic inspection requiredRepair not possible

3.Design Life50 years30 years30 years50 years

4.Friction Factor(Hazen Williams Coefficient c Value)150140140150

5.ThicknessOptimized by DesignStandard DimensionsOptimized by DesignStandard Dimensions

6.Surge PressureBest in handlingsurgepressuresProtection device neededProtection device neededReasonably good

7.WeightLight Weight5-6 times heavier than GRP3-4 times heavier than GRPWeight is higher than GRP due to higher thickness


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