TECHNICAL MANUAL - Sharq.biz

ancillary equipmentaligning clamp• It prevents that, either during the fusioncycle or the subsequent cooling, thejointing can be submitted by axialstresses and bending moments.• It allows to revise possible off-centeringbetween both ends to be welded.• It allows to recover the our-of-round ofthe ovalized pipes.The aligning clamp is auxiliary to thewelding control unit, its use is essentialfor the successful electrofusion jointing.It consists of a support frame with fourjaws and reducing inserts to adapt the unitto the various diameters used; the centraladjustable joint allows the use also with integrated electrofusion fittings such as90° and 45° elbows.Simultaneous use of multiple aligning clamps will positively affect the speed ofinstallation.re-rounderIt is similar to the aligning clamp, but has wider jaws designed to exercise amechanical force on the pipe wall in order to correct ovalization without damagingits integrity.It corrects ovalizations higher than 1,5% within the limits foreseen by thestandard UNI 10521, in order to allow a correct jointing; normally it is used upto d n 110 which corresponds to the maximum nominal diameter recommendedfor coiled pipes.It can be manually driven or using hydraulic devices.54