BENDING OF HDPE PIPES Sample Clauses

BENDING OF HDPE PIPES. COLD BENDING: Small diameter pipes can be “cold bend” for radius greater than 20 times the outside diameter of pipes. Cold bending should be done only for pipes for which the operating temperatures are ambient temperatures. HOT BENDING: Formation of small radius bend may easily be done by application of heat either by hot air oven or by immersion in a suitable liquid at an appropriate temperature. HDPE pipe should be heated in an inert liquid such as Glycerol (or other suitable oil in case of an emergency) at a temperature of 130 C. electrical heating coils or plates may also be used but only by experienced technicians. In preheating operations, the low thermal conductivity of HDPE should be kept in mind. Overheating can usually be recognized by surface discolouration and distortion. On the other hand, bending operations should not be performed at very low temperature, because of excessive stress that could result. Naked flames for heating should be used only by experienced operations. While bending, the bore of the pipe tends to collapse and these require support during the bending operation. Internal support should be affected by packing the bore of pipe with warm fine dry sand or by inserting rubber pressure hose, rubber rod, or a flexible spring. After the pipe is uniformly heated, it should be pulled around a simple jig and held in correct position until cool. The radius of bend up to 50 mm dia. HDPE pipes should not be less than 5 times the outside diameter of pipe.
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