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

1.5 .4 Pipe shall be tested hydrostatically at the pressure specified in table 1.5TABLE 1.5Hydrostatic Test pressure for centrifugally cast socket & spigot pipes in MPaHydrostatic Test pressure for work in MPaClass Up to DN 600 (including) DN 700 & aboveLA 3.5 1.5A 3.5 2.0B 3.5 2.5Dn - Nominal diameter1.6 Tolerance on Barrel diameter and socket dimensions suitable for (Lead Joints)are given in table 1.6 belowTable No. 1.6Tolerance for caulking spaceDimensions Nominal diameter (DN) Tolerances in mm(a) External diameter ofbarrel (DE)All diameters±1/2 f = ± (4.5+0.0015DN)(b) Internal diameter ofsocket (DI)All diameters±1/3 f= ± (3±0.001 DN)(c) Depth of socket (P)(1) Up to and including600mm±5(2) Over DN 600mm and upto and including 1000mm±10Note: f is the caulking space of the joint in millimeters and is equal to (9 +0.003DN).1.7 Length of pipes:(See Drawing No.-1)1.7.1 Length of pipes does not include the length of the socket of the pipe.1.7.2 Length - Effective length of pipe, as shown on the drawings.Note - For flanged pipes the effective length is equal to the overall length and isnoted L. For socketed pipes the effective length is equal to the overall lengthminus the spigot insertion depth.1.7.3 Tolerance on length:The tolerance on length of pipes shall be as under:Type of castingTolerance in mm(a) Socket and spigot pipes ± 100(b) Flange pipes ± 101.7.3 On the total number of socket and spigot pipes to be supplied in each diameter,the Manufacturer may supply up to l0 percent in lengths shorter than thespecified length as mentioned under:-Urban Administration & Development Department Page 14