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

4.7.2.3 Lengths of FittingsThe permissible deviations on the lengths of fittings shall be as underDeviation on Lengths of FittingsTable No.4.11(Refer Table No. 14 IS 9523-2000)nominal DiameterTypes of fittingsDN mmFlange socket, FlangedSpigot, Collars, tapers80 to 1200 ±25Deviation inL & H mmTees 80 to 1200 ± 50/-25Bends 90º (1/4) 80 to 2000 ± (15 + 0.03 DN)Bends 45º (1/8) 80 to 2000 ± (10 + 0.025 DN)Bends 20º (30) and11º (15)80 to 1200 ± (10 + 0.02 DN)4.8 Marking4.8.1 Each fittings shall have as cast, stamped or indelibly painted on it, the followingappropriate marks.(a) Indication of the source of manufacture.(b) The nominal diameter(c) The last two digits of the year of manufacture.(d) PN rating of flanges when applicable, and(e) Any other mark required by the purchaser.4.8.2 Marking may be done on the barrel of castings or on the outside of the sockets.4.8.3 BIS Certification MarkingThe fittings may also be marked with the Standard Mark.4.8.4 The use of the Standard Mark is governed by the provisions of the Bureau of IndianStandards Act, 1986 and the Rules and Regulations made there under. The details ofconditions under which the license for the use of the Standard Mark may be granted tomanufacturers or producers may be obtained from the Bureau of Indian Standards.4.9 Specification for Laying and jointing of Pipe Line System for water Supply.Code of practice for use and laying of DI Pipes should be as per IS 12288:1987.4.9.1 Preparatory work:The contractor will inspect the route along which the pipe line is proposed to be laid.He should observe/find out the existing underground utilities/construction and proposean alignment along which the pipeline is to be laid.4.9.2 He should make all efforts to keep the pipe as straight as possible with the help ofranging rods. Wherever there is need for deviation, it should be done with the use fornecessary specials or by deflection in pipe joints.4.9.3 The alignment as proposed should be marked on ground with a line of white chalk andgot approved from engineer In charge. The contractor will than prepare an L-Sectionalong this alignment showing the location of proposed pipe line. The L-section shouldalso be got approved from the site Engineer. The position of fittings, valves, shall beshown on the plan.Urban Administration & Development Department Page 50