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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 /> Page 46 <br />