COMPLIANCE INFO_FINAL WMU FU-23 DESIGN RPT & CONCURRENCE LTRS

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Page 45 • Verify that pipe ends are squarely faced with the facing tool of the fusion welding machine. • Verify that pipe ends line up in the fusion welding machine and that the pipe ends meet squarely and completely over the entire surface to be welded. Verify at this point that the pipe is securely clamped into place so that the pipe does not move during the fusion welding process. • Verify that the heater plate is clean and maintains the appropriate temperature. Verify that the heater plate is inserted between the aligned pipe ends and that the pipe ends are firmly brought into contact with the heater plate. NO PRESSURE should be applied to achieve the melt pattern. • Verify that the pipe ends are allowed to heat and soften. As the pipe heats and softens a melt bead begins to roll back from the contact point of the heater plate and the pipe ends. Approximate diameter size of melt beads for various sizes of pipe are as follows: Pipe Size Diameter of Melt Bead 2-inch and below 1/16-inch 3-inch to 5-inch 1/18-inch 5-inch to 12-inch 3/1-6-inch 12-inch to 22-inch 1/4-inch to 5/16-inch 24-inch to 54-inch 5/16-inch to 7/16-inch • Verify that the heater plate is removed quickly and cleanly when the appropriate melt bead is achieved and that no melted pipe material sticks to the heater plate. If melted material sticks to the heater plate, verify that this joint is discontinued, the heater plate is cleaned, the pipe ends are re-faced, and that the joint is re-started. • Verify that the melted pipe ends are rapidly joined together and that enough pressure is applied to the joint to form a melt bead 1/8-inch to 3/16-inch in diameter around the entire circumference of the pipe. Pressure is critical to cause the heated material of each pipe end to flow together. • Verify that the joint is allowed to cool and solidify properly before the pipe is released from the fusion welding machine. Cooling and solidification is completed when your finger can remain comfortably on the bead. • Examine the joint when the pipe is released from the fusion welding machine to verify that the weld is completely around the entire circumference of the pipe.