particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 530 5.4 The SBR should be wiped clean, fluxed and then placed in the socket with the bulb towards the back of the socket. The groove in the SBR must be located on the retaining bed in the socket and the retaining heel of the SBR firmly bedded on its seating. 5.5 It is necessary to ensure that the SBR fits evenly around the whole circumstance, removing any bulges which would prevent the proper entry of the spigot end. In the larger diameters, this operation may be assisted by forming a second loop in the SBR opposite the first, then pressing the loops flat one after the other. 6.0 JOINTING OF C.I. / D.I. PIPES, SPECIALS AND APPURTENANCES BY LEAD The joint between two D.I. Pipes shall be made by the use of styrene butudine rings (SBR) while any other joint wherein, rubber rings can not be used; lead joints shall be made by the Contractor as specified. 6.1 After the Engineer has checked and certified that pipes, specials and appurtenances are laid in proper alignment and level, the sterilized spun yarn of approved quality shall be driven tightly against the inside base of the socket with suitable tool. A ring of hume rope covered with clay is wrapped around the pipes at the end of the socket with suitable tool. A ring of hume rope covered with clay is wrapped around the pipes at the end of the socket leaving a hole into which molten lead shall be poured. The lead used shall be soft and of approved quality consisting of 99.99 % pure lead on analysis and shall conform to IS 782 of 1962. The average consumption of
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 531 joining materials shall generally be in accordance with IS 3114 of 1965 as amended upto date (Refer Table 1 below ). The contractor shall bear the expenses if testing the lead in laboratory if demanded by the engineer. All the jointing material such as spun yarn, pig lead, jointing tools and melting equipment shall be provided by the contractor. Table no.1 LEAD AND SPUN YARD FOR DIFFERENT SIZES OF PIPES Nominal diameter of pipe (in mm) Lead joint (in kg.) Depth of lead (in mm ) Yarn /Joint (in kg.) 80 1.80 45 0.10 100 2.20 45 0.18 125 2.60 45 0.20 150 3.40 50 0.20 200 5.00 50 0.30 250 6.10 50 0.35 300 7.20 55 0.49 350 8.40 55 0.60 400 9.50 55 0.75 450 14.00 55 0.95 500 19.00 65 1.00 600 20.00 65 1.20 700 22.00 65 1.35 (The quality given above is provisional and 20% variation may be allowed)
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