HDPE pipe, especially in larger sizes has a tendency to oval, usually  as a result of excessive heat from the sun coupled with loading pressures.  This can result in problems at the jobsite installing the electrofusion fitting, which is round.  The problem can be easily overcome with electrofusion re-rounding clamps which will quickly bring the oval pipe ends back to their original shape.  Countless installation hours may be avoided by utilizing the clamps.  The electrofusion re-rounding clamps are available for purchase or rental. 

 

Links  www.hdpe-pipe.com/pages/electrofusion.htm

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