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• Examine the joint when the pipe is released from the fusion welding machine to verify <br />that the weld is completely around the entire circumference of the pipe. <br />5.2.3 Flanged Connections Installation <br />• Verify that polyethylene flanges are at the same temperature of the surrounding backfill <br />soil at the time the flanges are bolted to prevent relaxation of the flange bolts and loosing <br />of the joint due to thermal contraction of the polyethylene material. Verify that the flange <br />bolts are re -tightened 24 -hours after the flange bolts were initially tightened. <br />L' <br />Page 52 0 <br />