![]() The allowable radius of curvature depends on the temperature of the pipe and the SDR. For curves of smaller radius, post formed bends or moulded fittings shall be used. ![]() During installation, the minimum allowable bending radius, as shown below, should be observed. Where mechanical joints are used, any joint deflection limitations must be observed. Care must be exercised during construction to prevent over stressing of joints and fittings. Large diameter PE pipes (450mm and above) must be joined together, and then drawn evenly to the desired radius. Instead, the pipe should be progressively supported with backfill material as the curve is formed. Pegs or stakes are not permitted to achieve the pipeline curvature as these can result in highly localised stresses. This can lead to kinking in small diameter, and/or thin wall pipes. This flexibility enables PE pipes to accommodate uneven site conditions, and, by reducing the number of bends required, cuts down total job costs.Īll PE pipes installed on a curved alignment must be drawn evenly over the entire curve length, and not over a short section. Vinidex PE pipes are flexible in behaviour and can be readily bent in the field.
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