Pipe hangers should not be over-tightened. Clamp, saddle, angle, spring or other standard types of supports and hangers may be used where necessary. The pipe must be adequately supported in order to prevent sagging and excessive distortion. If a pipeline is subjected to continuous vibration such as at the connection with a pump, it should be connected by a flexible joint or, if possible, the system should be redesigned to eliminate the vibration. Any deviations will result in undue stress on the jointing fittings which could lead to premature failure. Where connections are made to other sections or to fixtures such as pumps or motors, care should be taken to ensure that the sections are axially aligned. Where a PVC pressure pipeline is used to supply cold water to a hot water cylinder, the last two metres of pipe should be made of copper and a non-return valve fitted between the PVC and copper line to prevent pipe failure. PVC pipe should not be laid on steam lines or in proximity to other high temperature surfaces. In above ground installations, pipes should be laid on broad, smooth bearing surfaces wherever possible to minimise stress concentration and to prevent physical damage. ![]() ![]() To be read in conjunction with AS/NZS 2032 and AS/NZS 3500.
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