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Edgewater Creek Bridge Replacement November 2023 150 fusion welding residues or other substances that may result in faulty pipe 1 joining. 2 3 C. The joining rig, or fusion machine, shall have hydraulic pressure control for 4 fusing two pipe ends together and shall be equipped with gages to monitor 5 fusion pressures. The machine shall be equipped with an electric or 6 gasoline engine powered facing unit to square and trim the pipe ends 7 smooth and provide full surface contact with the heating plate. The heating 8 plate on the fusion machine shall be electrically heated and thermostatically 9 controlled, capable of maintaining 500 degrees F (plus or minus 10 degrees 10 F), and shall contain a temperature gage. Fusion temperature shall be as 11 recommended by the pipe manufacturer. 12 13 D. Butt fusion shall conform to ASTM F2620, Standard Practice for Heat 14 Fusion Joining of Polyethylene Pipe and Fittings, and pipe manufacturer's 15 criteria for the type of joining. Joint strength shall be greater than that of 16 the adjacent pipe. 17 18 E. The inside and outside of pipe ends shall be cleaned with a cotton or non-19 synthetic cloth to remove dirt, water, grease, and other foreign materials. 20 The pipe ends shall be cut square and carefully aligned just prior to heating. 21 22 F. After achieving the proper melt pattern, the pipe ends shall be brought 23 together in a firm, rapid motion applying sufficient pressure to form a pipe 24 bead (1/8-inch to 3/16-inch in height) around the outside and inside of the 25 entire circumference of the pipe. Prior to installation of the HDPE pipe, the 26 Contractor shall remove the interior bead to provide a smooth interior 27 surface. 28 29 G. The butt-fusion method for pipe joining shall be carried out in the field by 30 certified operators with prior experience in fusing HDPE pipe with similar 31 equipment using proper jigs and tools per standard procedures outlined by 32 the pipe manufacturer. It shall be the sole responsibility of the Contractor to 33 provide an acceptable butt-fusion joint. 34 35 H. All joints shall be made available for inspection by the Engineer before 36 insertion. 37 38 7-04.3(2)F Finishing, Clean-up and Testing 39 After completing the pipe installation, flush and clean all parts of the system by 40 removing all accumulated construction debris, rocks, gravel, sand, silt, and other 41 foreign material from the pipe. 42 43 Pipe shall be tested using low pressure air test methods in accordance with Section 44 7-17.3(2)F. 45 46 7-04.4.DOCX 47 Measurement 48 49 7-04.4.INST1.DOCX 50 Section 7-04.4 is supplemented with the following: 51 52