Specifications Part 1 - Water Supply, Sewerage and Tube Well Works
Specifications Part 1 - Water Supply, Sewerage and Tube Well Works
Specifications Part 1 - Water Supply, Sewerage and Tube Well Works
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CHAPTER -10ASBESTOS CEMENT PRESSURE PIPES, JOINTS AND FITTINGS FOR WATER SUPPLYAND ACP PIPES AND FITTING FOR SEWERAGE10.1 Applicable Code:The laying of ACP pipes <strong>and</strong> fittings / specials shall comply with all currentlyapplicable statutes, regulations, st<strong>and</strong>ards <strong>and</strong> codes. In particular thefollowing st<strong>and</strong>ards, unless otherwise specified herein, shall be referred. In allcases, the latest revision of the st<strong>and</strong>ards/codes shall be referred to. Other IS:Codes not specifically mentioned here but pertaining to the use of ACP pipes,fittings & specials shall be part of this Specification.Table No.10.1IS: 1592 -2003 Code of practice for asbestos cement pressure pipes <strong>and</strong> jointsIS:5531 -1988 Specification for cast iron specials for asbestos cementpressure pipesIS : 6908-1991:- Asbestos Cement Pipes <strong>and</strong> Fittings for <strong>Sewerage</strong> <strong>and</strong>DrainageIS:6530 1972 Code of practice for laying of asbestos cement pressure pipeIS: 5382- 1985 Rubber rings for water mains, sewer mains <strong>and</strong> gas mainsIS: 8794 1988 Detachable joints for AC pressure pipesIS: 10292- 1988 Rubber rings for detachable joints for AC pressure pipes10.2 Manufacturing Process of Asbestos Cement Pressure Pipes10.2.1 Asbestos cement pressure pipes shall be made from a thorough <strong>and</strong>homogeneous mixture of asbestos fiber <strong>and</strong> 33 grade ordinary Portl<strong>and</strong> cementconforming to IS 269 or 43 grade ordinary Portl<strong>and</strong> cement conforming to IS8112 or 53 grade ordinary Portl<strong>and</strong> cement conforming to IS 12269.The Mazza process employs vat <strong>and</strong> sieve cylinder for converting AsbestosCement slurry into thin lamina ranging between 0.25mm to 0.35mm thickness.The lamina so formed is then transferred to an endless synthetic felt whichmoves over powerful vacuum boxes to facilitate dewatering of individual laminato a desired level. The dewatered lamina is then wrapped on a hollow steelcylinder called m<strong>and</strong>rel under a high pressure ranging between 60Kg/Cm 2 to25Kg/Cm 2 . The pipes are dried in a heating tunnel having temperature 70 0Centigrade to 90 0 Centigrade before extraction of the m<strong>and</strong>rel so as to preventdeformation of the pipes.10.2.2 Classification10.2.2.1 Pipes of nominal diameter up to 1000 are classified according to the workshydraulic test pressure given in Table No.10.2.Urban Administration & Development Department Page 111
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