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B . The manufacturer of the PE pipe shall supply or s eci all PE <br /> fittings and accessories as well as any adapters and/or specials <br /> required to perform the work as shown on the Drawings and <br /> specified herein . <br /> C . All transition from PE pipe to PVC or ductile iron shall be made <br /> per the PE , PVC , or ductile iron pipe manufacturer' s <br /> recommendations and specifications whichever is more stringent . <br /> A molded flange connector adapter within a carbon steel back-up <br /> ring assembly shall be used for pipe type transitions . Ductile iron <br /> back-up rings shall mate with cast iron flanges per ANSI B16 . 1 . A <br /> 316 stainless steel back-up ring shall mate with a 316 stainless <br /> flange per ANSI B16 . 1 . . <br /> D . The pipe manufacturer must certify compliance with the above <br /> requirements . <br /> 3 . 11 JOINTING METHOD <br /> A. The PE pipe shall be joined with butt , heat fusion joints . All joints <br /> shall be made in strict compliance with the manufacturer's <br /> recommendations . <br /> B . Lengths of pipe shall be assembled into suitable installation <br /> lengths by the butt-fusion process . All pipe so joined shall be <br /> made from the same class and type of raw material made by the <br /> same raw material supplier. Pipe shall be furnished in standard <br /> laying length 's not to exceed 50 feet. <br /> C . The polyethylene flange adapters at pipe material transitions shall <br /> be backed up by stainless steel flanges conforming to ANSI 816 . 1 <br /> and shaped as necessary to suit the outside, dimensions of the <br /> pipe . The flange adapter assemblies shall be connected with <br /> corrosion resisting bolts and nuts of Type 316 Stainless Steel as <br /> specified in ASTM A726 and ASTM A307 . All bolts shall be <br /> tightened to the manufacturer's specified torques . Bolts shall be <br /> tightened alternatively and evenly. <br /> 3 . 12 PIPE IDENTIFICATION <br /> A. The following shall be continuously indent printed on the pipe or <br /> spaced at intervals not exceeding 5-ft. <br /> 1 . Name and/or trademark of the pipe manufacturer. <br /> 2 . Nominal pipe size . <br /> 3 . Dimension ratio . <br /> 4 . The letters PE followed by the polyethylene grade in <br /> accordance with ASTM D1248 , followed by the hydrostatic <br /> design basis in 160's of psi , e . g . , PE 3408 . <br /> 3 - 5 <br />