Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

Nominal diameterTable 2.3Refer Table 1 IS 1538:1993Fittings withoutBranches or WithBranches not Greaterthan Half the principalDiameter MPa (N/mm 2 )Test pressureFittings with Branchesgreater than Half thePrincipal DiameterUpto 300 mm (including) 2.5 (25) 2.5 (25)Over 300 mm up to 600 mm (including) 2.0 (20) 2.0 (20)Over 600 mm up to 1500 mm (including) 1.5 (15) 1.0 (10)3.6 Double flanged cast iron (Horizontal cast) pipes3.6.1 Double flange cast iron (horizontal cast) pipes 80 mm to 750 mm class B forwater supply pressure mains shall conform to IS: 71813.6.2 The general requirement relating to the supply of material shall be laid down inIS: 1387-1967.3.6.3 Grey cast iron used for the manufacture of pipes shall conform to any of theappropriate grades, as specified in IS: 210-1978.3.6.4 The pipes shall be stripped with all precautions necessary to avoid warping orshrinkage defects. The pipes shall be free from defects, other than unavoidablesurface imperfection which result from the method of manufacture and whichdo not affect the use of the pipes.3.6.5 The pipe shall be capable of being cut with the tools normally used forinstallations.3.6.6 The flange shall be at right angles to the axis of the pipes and machined onface. The bolt holes shall be drilled3.7 Mechanical TestsSupplied pipes shall be mechanical tested as per details given in IS: 7181. Testshall be carried out during manufacture of pipes after every 4 hr interval.3.8 Hydrostatic Test3.8.1 Pipes shall be tested hydrostatically at a pressure specified Table 3.5. Pipesshall not show any sign of leakage, sweating or other defects of any kind.Table No. 3.5Hydrostatic Test pressure for horizontally cast pipesRefer Table 1 IS 7181-1986Nominal DiameterDNTestPressureSuggested Maximum Hydraulic workingpressure including surge(1) (2) (3)MPaMPaUp to and including 300 mm 2.5 1.2over 300 mm and up to and 2.0 1.0including 600 mmover 600 mm 1.5 0.6Urban Administration & Development Department Page 38