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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. Strinains 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 />