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

5.6.3 The minimum length of any socket shall be Ls = 0.5xdn+6mm5.7 Pipe ends:-The ends of the pipes meant for solvent cementing (both plain and bell ended)shall be cleanly cut and shall be reasonably square to the axis of the pipe ormay be chamfered at the plain.5.8 Physical and chemical characteristics5.8.1 Visual appearance5.8.2 The internal and external surface of the pipe shall be smooth, clean and freefrom grooving and other defects. Slight shallow longitudinal grooves orirregularities in the pipe shall be permissible provided the wall thicknessremains within the permissible limits.5.8.3 Opacity:-The wall of the plain pipe shall not transmit more than 0.2 percent of the visiblelight falling on it when tested in accordance with IS: 12235 (Part-3)5.8.4 Effect on water:-The pipe shall not have any detrimental effect on the composition of waterflowing through them.5.9 Marking5.9.1 Each pipe shall be clearly and indelibly marked in ink/paint or hot embossed onwhite base at intervals of not more than 3 meters, in colour. The marking shallshow the following:a) -markb) Out side diameter,c) Class of pipe and pressure rating,c) Batch or lot number, ande) The word plumbing in the case of plumbing pipes.5.9.2 The information according to 5.9.1 shall be marked in colours as mentionedbelow:-ClassColourClass 3GreenClass 4brownClass 5Yellow5.9.3 In case of hot embossing, pipe shall also be provided near the end withcircumferential colour band as mentioned above in clause 5.9.1, to identify theclass of pipe.Urban Administration & Development Department Page 57