GAIL (India) Limited
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GAIL (India) Limited

GAIL (India) Limited GAIL (India) Limited

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13.07.2015 Views

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

865.2.4 TRENCH FILLING OF G.I. PIPESThe pipe shall be laid on layer of 10 cm sand and filled up to 15 cm above the pipes The remainingportion of the trench shall than be filled with excavated earth and the surplus earth shall be disposed off asdirected by Engineer-in-charge/Consultant The pipes shall be embedded in sand or soft soil free from rockand gargle and where the pipe lime crosses a road or a drain, it shall be through RCC pipe5.2.5 FERRULE CONNECTIONFerrule connection shall be inclusive of necessary excavation, boring a hole in cast iron mains, tapping itproviding necessary saddles, and bailing out of water.5.2.6 TESTINGa) On completion the pipe line laying shall be tested to a Hydraulic pressure of 7 kg/sq.cm. (70 meter),Pressure shall be maintained for a period of two hours without drop. Any joint found leaking shall beredone and all leaking pipes removed and replaced Testing shall be done before the trenches are refilled.The contractor shall arrange all the equipment required for testing and the rate quoted shall be deemed tobe inclusive of this cost.b) Contractor shall maintain a test register and tests shall be recorded in it. The entries shall be signed anddated by Consultant, Project manager and contractor. This register shall be handed over to the projectManager on completion of work.c) G. I. pipes shall be measured per linear meter (to be nearest centimeter) and shall be inclusive of allfittings, earth work, pipe protection and other items as specified.5.3 FERRULESThe ferrules for connection with CI shall generally conform to IS 2692: 1964. It shall be of non ferrousmaterials with CI bell mouth cover and shall be nominal bore as specified. The ferrule shall be fitted withscrew and plug or valve capable of completely shutting off the water supply to communication pipe as andwhen required.5.4 VALVE CHAMBERSContractor shall provide suitable brick masonry chambers in cement mortar 1:5 (1 cement: 5 coarse sand)on cement concrete foundations 150 mm thick 1:5:10 (1 cement: 5 coarse sand: 10 graded stone aggregate40 mm nominal size) 15 mm thick cement plaster inside and outside finished with a floating coat of neatcement inside with cast iron surface box including excavation, back filling completea) Valve chambers shall be of following sizes :-For depths 90 cms.For depths up to 100 cms. beyond60 x 60 cms120 x 120 cms5.5 TESTINGa) All pipes, fittings and valves shall be tested by hydrostatic pressure of 7 kg./sq.cm.b) Pressure shall be maintained for a period of at least two hours without appreciable drop in the pressureafter fixing at site (+/ -, 10%)c) At least register shall be maintained and all entries shall be signed and dated by contractor(s) andConsultant/Engineer-in-charge.d) In addition to the sectional testing carried out during the construction, contractor shall test the entireinstallation after connections to the overhead tanks or pumping system or mains. He shall rectify allleakage, and shall replace all defective materials in the system. Any damage done due to carelessness,

865.2.4 TRENCH FILLING OF G.I. PIPESThe pipe shall be laid on layer of 10 cm sand and filled up to 15 cm above the pipes The remainingportion of the trench shall than be filled with excavated earth and the surplus earth shall be disposed off asdirected by Engineer-in-charge/Consultant The pipes shall be embedded in sand or soft soil free from rockand gargle and where the pipe lime crosses a road or a drain, it shall be through RCC pipe5.2.5 FERRULE CONNECTIONFerrule connection shall be inclusive of necessary excavation, boring a hole in cast iron mains, tapping itproviding necessary saddles, and bailing out of water.5.2.6 TESTINGa) On completion the pipe line laying shall be tested to a Hydraulic pressure of 7 kg/sq.cm. (70 meter),Pressure shall be maintained for a period of two hours without drop. Any joint found leaking shall beredone and all leaking pipes removed and replaced Testing shall be done before the trenches are refilled.The contractor shall arrange all the equipment required for testing and the rate quoted shall be deemed tobe inclusive of this cost.b) Contractor shall maintain a test register and tests shall be recorded in it. The entries shall be signed anddated by Consultant, Project manager and contractor. This register shall be handed over to the projectManager on completion of work.c) G. I. pipes shall be measured per linear meter (to be nearest centimeter) and shall be inclusive of allfittings, earth work, pipe protection and other items as specified.5.3 FERRULESThe ferrules for connection with CI shall generally conform to IS 2692: 1964. It shall be of non ferrousmaterials with CI bell mouth cover and shall be nominal bore as specified. The ferrule shall be fitted withscrew and plug or valve capable of completely shutting off the water supply to communication pipe as andwhen required.5.4 VALVE CHAMBERSContractor shall provide suitable brick masonry chambers in cement mortar 1:5 (1 cement: 5 coarse sand)on cement concrete foundations 150 mm thick 1:5:10 (1 cement: 5 coarse sand: 10 graded stone aggregate40 mm nominal size) 15 mm thick cement plaster inside and outside finished with a floating coat of neatcement inside with cast iron surface box including excavation, back filling completea) Valve chambers shall be of following sizes :-For depths 90 cms.For depths up to 100 cms. beyond60 x 60 cms120 x 120 cms5.5 TESTINGa) All pipes, fittings and valves shall be tested by hydrostatic pressure of 7 kg./sq.cm.b) Pressure shall be maintained for a period of at least two hours without appreciable drop in the pressureafter fixing at site (+/ -, 10%)c) At least register shall be maintained and all entries shall be signed and dated by contractor(s) andConsultant/Engineer-in-charge.d) In addition to the sectional testing carried out during the construction, contractor shall test the entireinstallation after connections to the overhead tanks or pumping system or mains. He shall rectify allleakage, and shall replace all defective materials in the system. Any damage done due to carelessness,

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