This specification refers to the trenchfill zone and not the embedment zone (for details of embedment zone requirements, refer to the MRWA Edition of the WSAA Water Supply and Sewerage Codes). This MRWA specification sets out the principle requirements for the backfill and compaction of soils in excavations associated with the construction of water supply and sewerage assets. Revisions include fitting design factors, amendments to jointing requirements, general test procedures for pressure applications, comments on use of repair clamps, advice and limitations for squeeze-off, new stiffness class requirement for non-pressure applications, additional option for internal colour of non-pressure pipes and new prerequisites for training. The 3rd edition of the Code builds on the experience and confidence of the urban water industry with use of PE pipelines. The WSAA Polyethylene (PE) Pipeline Code provides water industry practitioners with best practice guidelines in the use of PE pipeline systems and covers, pressure pipelines, non-pressure sewerage pipelines, vacuum sewer systems using polyethylene and pipe relining using polyethylene. This 2nd edition includes new codes to better describe some defects, a revised scoring system that recognises different relevances of particular defects on rigid and flexible pipes, revised structural and service grading thresholds, acceptance limits for defects for newly constructed sewers. It replaces the Sewer Inspection Reporting Code that was published in 2002. The WSAA Conduit Inspection Reporting Code focuses on condition assessment of conduits such as sewers, sanitary and stormwater drains, as well as maintenance structures.
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