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b) Face <br /> The component ends must be faced to establish clean, parallel mating surfaces. <br /> The equipment shall incorporate a rotating planer block in its facer to <br /> accomplish this goal. Facing shall be continued until a minimal distance exists <br /> between the fixed and movable jaws of the machine and the facer is locked <br /> firmly and squarely between the jaws. This operation shall provide for a <br /> perfectly square face, perpendicular to the pipe centerline on each component <br /> end and with no detectable gap . <br /> c) Alignment <br /> The pipe profiles must be rounded and aligned with each other to minimize <br /> mismatch (high-low) of the pipe walls. This shall be accomplished by adjusting <br /> the clamping jaws until the outside diameters of the pipe ends match. The jaws <br /> must not be loosened or the pipe may slip during fusion. <br /> d) Melting <br /> Ends of the components shall be heated to the pipe manufacturer' s <br /> recommended temperature, interface pressure, and time duration. By doing so, <br /> the heat will penetrate into the pipe ends and a molten "bead" of material will <br /> form at the pipe ends. Heating tools, which simultaneously heat both pipe ends, <br /> shall be used to accomplish this operation. These heating tools shall be <br /> furnished with thermocouples to measure internal heater temperature so that the <br /> operator can monitor the temperature before each joint is made. The heater <br /> faces, which come into contact with the pipe, shall be coated by the <br /> manufacturer to prevent molten plastic from sticking to the heater faces. <br /> e) Joinin¢ <br /> After the pipe ends have been heated for the proper time and to the proper <br /> temperature, the heater tool shall be removed and the molten pipe ends shall be <br /> brought together with sufficient pressure to properly mix the pipe materials and <br /> form a homogeneous joint. The pipe manufacturer' s instructions may specify <br /> either interface pressure or bead size of molten material as a guide for a proper <br /> joint. <br /> f) Holding <br /> The molten joint must be held immobile under pressure until cooled adequately <br /> to develop strength. The proper cooling times for the joint are : material, pipe- <br /> diameter, and wall-thickness dependent; and shall be as recommended by the <br /> pipe manufacturer. <br /> C . Strinpins of Pipe and Trace Wire <br /> The CONTRACTOR shall have appropriate rollers and a winch/cable system adequately <br /> sized to pull the joined pipe sections into the proper position for installation. <br /> 02400 — Directional Bore Crossings <br /> 02400 - 6 <br /> e <br />