GAIL (India) Limited

743.6 As far as possible no GI pipes shall be laid under floors of the toilet/kitchen.3.7 No GI pipe shall be laid in lime concrete, where required shall be embedded in PCC of 1:3:6 minimum 75mm all around or as directed by the Consultant.3.8 Sizes of the rising main, branch pipes from the rising main, down corners from the over head tank andbranch from down corners shall be of size as shown in drawings.4. CLAMPS & HOLDER BATS4.1 All pipes and fittings shall be fixed truly vertical and horizontal unless unavoidable. The pipes shall befixed to walls with standard pattern holder bat clamps of required shape and size so as to fit tightly on thepipes when tightened with screwed bolts. The clamps shall be embedded in brick work in cement mortar1:3 (1 cement : 3 coarse sand) and shall be spaced at regular intervals in straight lengths as shown in thetable given below :-lengthsSize of pipe mm…………………………………………………………………………Horizontal runs (m)Vertical runs (m)___________________________________________________________________________15 2.00 2.5020 to 32 2.50 3.0040 to 50 3.00 3.5065 to 100 3.50 5.00The clamps shall be fixed at shorter lengths near the fittings as directed by the Consultant / Engineer-incharge.4.2 All pipes shall be provided with unions at the location of fixing valves, pumps or any other fixedequipment so as to have easy detachment.5. TESTING5.1 After laying and jointing the pipes and fittings shall be inspected under working conditions of pressureand flow. Any joint found leaking shall be redone and all leaking pipes removed and replaced withoutextra cost. The pipe shall be slowly and carefully charged with water so that all air is expelled from thelines. The draw of taps and stop cocks shall then be plugged and hydraulic pressure of 6 kg/sq.cm. shallbe applied, gradually. Pressure gauge shall be accurate and recalibrated before the test. The test pumphaving been stopped, the pressure shall maintain itself without measurable loss for atleast half an hour.6. CLEANING AND DISINFECTION OF SUPPLY SYSTEM6.1 All water lines shall be thoroughly and efficiently disinfected before being taken into use and also afterevery major repair. The method of dis-infection shall be subject to the approval of theConsultant/Engineer-in-charge.7. INTERNAL WORK:7.1 The internal work shall include the cost of labour and material involved in all the operations describedabove. It shall include the cost of cutting holes in walls, floors and making good the same.7.2 This shall also include, concealed pipe work in which case cutting of chase and making good the same orpainting of pipes.8. CUTTING CHASES IN MASONRY WALL8.1 The chases up to 7.5 x 7.5 cm shall be made in the walls for housing GI pipes etc. These shall be providedin correct position as shown in the drawings or as directed by the Consultant. Chases shall be made by the