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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10.18.9.1 After the test has been completed, the trench shall be filled back.10.19 Disinfection of pipeline before commissioning10.19.1 Pipelines carrying potable water shall be suitably disinfected beforecommissioning.10.20 Measurement10.20.1 The net length of pipes as laid or installed shall be measured in running meterscorrect to a cm. Specials shall be excluded <strong>and</strong> measured <strong>and</strong> paid separatelyunder the relevant item. Excavation, refilling, masonry <strong>and</strong> concrete work (asrequired) shall be measured <strong>and</strong> paid for separately under relevant item ofwork.10.21 Rates :10.21.1 The rate shall include the cast of the material <strong>and</strong> labour involve in all theoperation describe in the item.10.22 Asbestos Cement Pipes <strong>and</strong> Fittings for <strong>Sewerage</strong> <strong>and</strong> Drainage IS :6908-1991:-10.22.1 Pipes :- The Pipes shall be made from a thorough <strong>and</strong> homogeneous mixtureof clean asbestos fiber, 33 grade ordinary Portl<strong>and</strong> cement conforming to IS :269 : 1989 or Portl<strong>and</strong> slag cement conforming to IS 455:1989 or Portl<strong>and</strong>pozzolana cement conforming to IS 1489:1976, <strong>and</strong> water. Addition of siliceousfiller is also permissible.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.10.22.2 The pipes shall be seamless, compact <strong>and</strong> homogeneous. Their internalsurface shall be regular <strong>and</strong> smooth.10.23. Classification :The pipes shall be classified according to their crushing strength as under:Class 1 60 kN/m 2Class 2 90 kN/m 2Class - 3 120 kN/m 210.24 Thickness:10.24.1 The nominal thickness of the pipes is the thickness of the barrel of the pipe,excluding the machined ends.10.24.2 The thickness of the barrel of the pipes may be verified from test piecessampled from transverse crushing test.Urban Administration & Development Department Page 126
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