![]() If a strap is fastened around a pipe, it should not distort the pipe in any way.Ī free support allows the pipe to move without restraint along its axis while still being supported. Metal straps used as supports should be at least 25 mm wide, either plastic-coated or wrapped in a protective material such as nylon or PE sheet. Brackets and Clipsįor either free or fixed pipeline supports using brackets or clips, the bearing surface should provide continuous support for at least 120° of the circumference. Where there is a risk of explosion, such as in some mining applications, safety precautions may be required. Metal surfaces should be insulated from the pipe by plastic coating, wrapping or other means.Ī build-up of static electricity on the outside surface of PVC pipes can occur. 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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