GAIL (India) Limited

85a) Water supply mains and sub mainsb) Control valvesc) Masonry chambers and other appurtenancesd) Excavation and refilling pipe trenchese) Concrete anchor blocksf) Ferrules, Ferrule chambers G.I. pipe below ground from ferrule to outer face of the building upto finished ground level.5.1.1 CONTRACTOR TO RESTORE SETTLEMENT AND DAMAGESThe contractor shall, at his own cost, make good during the whole period the works are in hand and duringdefect liability period thereafter, any settlement that may occur on the surfaces of roads, beams, footpaths,gardens, open spaces etc., whether public or private caused by trenches or by other excavations and shallbe liable for any accidents caused thereby He shall also, at his own expense and charges, repair and makegood any damage done to buildings and other property. If in the opinion of the Consultant/Engineer-incharge,he fails to make such works with all practicable dispatch, the Consultant/Engineer-in-charge shallbe at liberty to get the work done by other means and the expenses thereof shall be paid by the contractoror deducted from any money that may be or become due to him or recovered from him in any othermanner according to the law of the land5.1.2 DISPOSAL OF SURPLUS SOILThe contractor shall at his own cost shall provide places inclusive of transportation for disposal of allsurplus materials not required to be used in the works. As each trench is refilled the surplus soil shall beimmediately removed and the surface properly restored the roadways and sides shall be left clear.5.2.1 Trenches: The width and depth of trenches for different diameter of G.I under-Dia of PipeWidth of trench Depth of trencha) 15 to 50 mm 39 cm 60cmb) up to 100 mm 50cm 90cmc) Over 100 mm 60cm 90cmAt joints the width of trench shall be widened where necessary5.2.2 CUTTING AND THREADINGWhere pipes have been or re-threaded the ends shall be carefully filled out so that no obstruction to flowis offered the ends of pipes shall then be carefully threaded, in such a manner as will not result inslackness or joints.5.2.3 JOINTINGScrewed steel pipes shall be jointed with screwed and socket joints using screwed fittings of wrought iron,steel or malleable cast iron The pipes shall be cleaned and cleared of all foreign matter and may burrsfrom the ends or pipes removed before laying. In joining the pipes, the inside of the socket and thescrewed and the screwed and of the pipe shall be oiled and rubbed over with white lead and a few strandsof fine yarn or thread wrapped round the screwed in the socket, tee etc. Care shall be taken that all thepipes and fittings are properly jointed so as to make the joints completely water tight.5.2.3 PROTECTIONG.I. pipes below ground shall be protected against corrosion by the application of two coats of bitumenpaint covered with polyethylene tape and a final coat of anticorrosive bitumen paint