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<br /> Page 46 <br /> <br />5.2.3 Flanged Connections Installation <br /> <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 <br />flange bolts are re-tightened 24-hours after the flange bolts were initially tightened. <br /> <br /> <br />