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5.2.1 Equipment Preparation <br /> Generator(s) shall be fueled outside the extents of the lining system and be inspected for <br /> fluid leakage and mechanical damage that may result in damage to the lining system. <br /> Should it be necessary to place the generator over the lining system a suitable buffer <br /> strip shall be placed between the tires and the membrane. Generators without inflated <br /> rubber tires shall not be introduced over the lining system. Tires shall be pre-inspected <br /> to be free of foreign matter that may damage the membrane. Generators shall be <br /> positioned within close proximity of the seaming region and have adequate extension <br /> cords to complete an entire seam without the necessity to move the machine. <br /> Wedge welders shall be calibrated for ambient conditions and the material type/thickness <br /> to be welded.The front part of the seaming device should be inspected for sharp comers <br /> and irregular details,which may damage the liner. The major point for inspection is that <br /> no sharp edges should exist where FML sheet surfaces must pass over the heated wedge <br /> element. If a dual, or split, hot wedge seam is being made, the recessed space for the air <br /> track should be examined. Knurled pressure rollers shall be inspected for sharp surfaces. <br /> All wedge welder adjustments shall be checked daily. Cleaning of machine should be <br /> done at least daily. <br /> Extrusion welders shall have an initial inspection before warm up to confirm that the <br /> insulation and covers are in good condition and that the welding nozzles (or Teflon <br /> shoes) are correct for the FML to be seamed.Teflon shoes should be checked for proper <br /> weld bead geometry and excessive wear and replaced if necessary. They shall then be <br /> heated to the correct welding temperature for thickness of the material to be welded and <br /> then purged of all heat-degraded resin from within the barrel. During the purge process <br /> temperature controllers shall be monitored for proper function and that the welding rod <br /> feed systems and rotating tips are operating properly. <br /> 5.2.2 Trial Seams <br /> Before any welding is performed by either method on the actual membrane lining <br /> system, trial seam welds must first be performed yielding passing results. <br /> CLC shall prepare trial seams made with test strips of the actual membrane being <br /> installed to verify that seaming conditions are adequate. Such trial seams shall be made <br /> at the beginning of each seaming period (start of the day and midday)for each seaming <br /> apparatus used. Trial seams shall be made under the same conditions as actual seams. <br /> The trial seam sample shall be approximately 3 feet/1.0 m long by 1 foot/0.3 m wide <br /> (after seaming) with the seam centered lengthwise. Seam overlap shall be nominally 4 <br /> inches/10.2 cm, 3 inches/7.6 cm minimum. <br /> Unless otherwise specified,five(5) seam sample coupons each measuring 1"/25mm wide <br /> x 6'7150mm long shall be cut from the trial seam sample in increments to span its <br /> length. The specimens shall be tested in peel (3 ea.)and shear(2 ea.) modes using a <br /> field tensiometer. No seaming apparatus shall be used for seaming until deficiencies are <br /> corrected and two consecutive trial welds are successfully achieved. <br /> 5.3.0 Seam Layout <br /> In general, seams should be oriented parallel to the line of maximum slope, in the <br /> direction of slope, not across the slope(horizontal to slopes). Horizontal to slope seams <br /> should be no less than 5 feet(1.5 m)from the toe of the slope or areas of potential <br /> Created by Colorado Lining International 1-800-524-8672 6 <br />