BS ISO 21051:2020 pdf free.Construction and installation of ductile iron pipeline system.
BS ISO 21051 This document specifies the recommended practices and requirements for the installation of buried and above-ground ductile iron pipeline system conforming to iso 2531, Iso 7186 and ISo 16631.The recommended practices in this document are intended to provide the practical advices based
on the best methods of construction and installation of ductile iron pipeline system including pipes,fittings, valves and accessories.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 2531:2009, Ductile iron pipes, fttings, accessories and their joints for water applications ISO 4179:2005, Ductile iron pipes and fttings for pressure and non-pressure pipelines 一Cement mortar lining ISO 8179-1:2017, Ductile iron pipes, fttings, accessories and their joints一External zinc-based coating一Part 1: Metallic zinc with finishing layer
ISO 8180, Ductile iron pipes一polyethylene sleeving for site application ISO 10802, Ductile iron pipelines一Hydrostatic testing after installation The bottom layer is laid on two timbers, arranged in parallel, one being 1 m from the socket end and the other 1 m from the spigot end. The pipes are also parallel with one another. The pipes at the two ends are secured at the sockets and spigots with large wooden wedges nailed to the timbers. Strong stopper shall be used at both ends of the bottom layer to avoid stock collapse. Dimensions of S1, S2 and S3 shall be decided to ensure proper socket segregation of pipes in the same tier.The upper layers consist of pipes laid alternatively, socket to spigot, with the sockets in one tier overhanging the spigots of the pipes in the tier below. All the sockets of one tier overhang the spigots of the tier below by approximately 10 cm, thus avoiding the deformation of the spigots.BS ISO 21051 pdf download.