GAIL (India) Limited

793 SOIL, WASTE, RAIN WATER, VENT AND ANTI-SIPHONAGE PIPES & FITTINGS:3 1 All soil, waste and anti-siphonage pipes and fittings used within sunken floor areas or within plumbingshafts vertical run, shall be cast iron socket and spigot type pipe conforming to IS 1729 - 1967 or itssubsequent revision All cast iron pipes and fittings shall be of the best approved Indian make of soilvariety preferably of spun quality and hot dipped in Dr Angus Smith Solution and free from flaws, airbubbles, cracks, sand-holes and other defects, truly cylindrical and uniform in thickness They shall not bebrittle but shall allow for heavy cutting chipping and drilling but shall not be less than 6mm thick and ofthe diameter, mentioned in the schedule of quantities They shall be of the largest length available andshall be fixed against the wall on special ‘U’ clamps - 25mm wide 3mm thick and hot dip galvanized bymeans of round headed flat nail of 75mm long on brick wall. In case of hollow block wall or brickmasonry walls (if so specified) - 50 x 50 x 75 long teak wood bats soaked in bitumen paint should be firstfixed to the wall Pipes shall be fixed against these wooden blocks as above by clamps and nails3.2 Jointing shall be carried out with molten lead. The spigot of the pipe must be forced well home into itssocket and must be entered, so that the joint may be of even thickness all round. Atleast, one complete lapof clean white hemp spun yarn shall be drawn into the socket without being forced through the joint intothe pipe Lead shall then be poured into the joint and caulked tight The joint shall then be run with moltenlead in sufficient quantity so that after being caulked solid, the lead may project 3mm beyond the face ofthe socket against the outside of the spigot but must be flush with the outside edge of the socket.Minimum quantity of lead per joint for 100 and 75mm dia pipes shall be 1.8kg and 1.36 kg respectively.3.3 Clean outs at the head of C.I, S/S horizontal pipes running under the floor shall be of cast brass screwed intype. Floor and wall clean outs shall be of cast brass screwed type. The connecting pieces shall be of G.Ithreaded coupling to suit the clean out with lead caulked joint.3.4 Inspection chambers, gully traps, etc within the building i.e. for diversion of pipes at upper flows or onservice floor shall be cast iron chambers with bolts, nuts to close the cover, all to be fabricated as peractual requirement3.5 Supports, pedestal and base for inspection chambers, gully traps and pipes when provided as per aboveshall be in 1:2:4 cement concrete mix3.6 Pipe sleeves and inserts, etc. through RCC walls of buildings either external or internal or for water tanksshall be of C.I. or M.S. provided with water bar flange.3.7 During installation open ends of pipes shall be closed with a plug made of wood, cut in to required shapeand covered with gunny bags to prevent access to dirt in to the pipe3.8 G.I. Waste pipes and fittings shall be ‘C’ class with G.I. unions, tail piece reducers and connections to beprovided between joints to either lead or C.I. Pipes.3.9 W.C. pan connectors shall be to suit the requirements as per drawing, with 40 dia vent horn for connectionto the anti-siphonage pipe Pan connector shall be of C.I. or lead3.10 Connection to the sewer or storm water collection sumps to be perfectly water tight and as specified in thedrawing3.11 Rainwater flashing shall be of 150 X 100 or 230 X 150 fitted on to the bell mouth of rainwater pipes inletand then covered with cast iron grating and extension piece3.12 All rainwater pipes and fittings shall be UPVC type variety conforming to latest IS code.3.13 The floor traps for toilet blocks shall be cast iron with CP brass grating, bolted down design. The trapsshall be provided with minimum water seals of 40 to 50 mm.3.14 Where toilet slabs are sunk, the floor trap shall be of 100 x 75 heavy duty type C.I ‘P’ trap, with C PBrass grating, bolted down design3.15 Bathroom CP grating shall be of bolted down design out of heavy cast brass with chromium plating of thebest approved standard