2004-138 - Laserfiche WebLink

Home Browse Search

material , installation , and workmanship shall conform to applicable sections of AWWA C105 (ANSI A21 . 5-88 ) , or latest revision . ' Installation methods A or B shall be employed using flat tube polyethylene . The Contractor shall make provisions to keep the polyethylene from direct exposure to sunlight prior to installation , and backfilling following installation shall be completed without delay to avoid exposure to sunlight. 1 . 06 BELL AND SPIGOT CONNECTIONS ' Joints in bell and spigot i e shall be push- on , mechanical , or restrained joints in accordance with AWWA Standard C- 111 (ANSI 21 . 11 -85 ) , or latest revision . Mechanical joint pipe set-screw type retainer glands will be permitted on a case-by-case basis , when restrained mechanical joints , in accordance with AWWA Standard C- 111 (ANSI 21 . 11 -85 ) , or latest revision , are impractical . Thrust blocks may be required by IRCDUS in cases where retainer glands are used . 1 . 07 FLANGED CONNECTIONS A . All flanged pipe barrels shall comply with the physical and ' chemical requirements as set forth in the Handbook of Ductile Iron Pipe of the Cast Iron Pipe Research Association . Flanges shall be in accordance with ANSI Specification B16 . 1 for Class 125 ' flanges . Bolts shall comply with ANSI Specification B18 . 2 . B . Flanged pipe shall be faced and drilled to the American Standard drilling , unless special drilling is called for or required . Where tap ' or stud bolts are required , flanges shall be tapped . Flanges shall be accurately faced and drilled smooth and true , at right angles to the pipe axis and shall be covered with zinc dust and tallow, or a rust preventive compound immediately after facing and drilling . C . Flanged pipe with screwed-on flanges shall be furnished with long ' hubs , and the flanges shall be screwed on the threaded end of the pipe in the shop , and the face of the flange and end of pipe refaced together. There shall be no leakage through the pipe threads and the flanges shall be designed to prevent corrosion of the threads from outside . ' D . Flanged joints shall be made with bolts or stud bolts and nuts . Bolts , stud bolts , and nuts shall conform to American Standard heavy dimensions , semi -finished with square or hexagonal heads and cold punched hexagonal nuts , meeting the requirements of ' ASTM Designation A-307 . Bolt sizes shall be American Standard for the flanges specified , and bolts and nuts shall have good , true threads . E . Gaskets shall be in accordance with AWWA Standard C- 115 (ANSI A21 . 15-88 ) , or latest revision . ' 02625 - 3 FAUtilities\UTILITY - ENGINEERING\WTP - North RO\N RO Brine Line Discharge - UCP#2208\BID DOCUMENTS North County RO\BID DOCUMENTS\02625 WM Ductile Iron Pipe and Fittings .doc