METHOD OF JOINTS Sample Clauses

METHOD OF JOINTS. Following methods shall be used for welding and joining of HDPE pipeline installation work.  The ends of pipes to be joined should be cut vertically at right angles with a fine toothed saw and trimmed with a file to make both ends smooth so that the pipes when pressed together do not leave any gap.  Both the inside and outside surfaces of the ends of pipes should be scrapped (up to about 12 mm from the end) with a sharp scraper to remove the thin oxidized layer.  To ascertain that there are no extraneous particles of dust, mud, grease, polyethylene powder etc. at the joining portions of the pipes.  Pipes should be held firmly with the use of Mechanical Jack in horizontal position and with adjustment, perfect alignment and which is not affected when pipes are withdrawn from the HEAT MIRROR and again brought together for joining.  A Electrical HEAT MIRROR (HOT PLATE) is to be used for heating the ends of pipes. The pipes should be pressed fresh against the flat surfaces of the HEAT MIRROR one on each side horizontally and held in position under slight pressure. The HEAT MIRROR should be maintained at a steady temperature of 200 C with the help of THERMOSTAT. After a slight rim is formed at the ends of the pipes on both inside and outside, of about 2.50 mm to 3.0 mm the pipes should be pulled apart and the HEAT MIRROR quickly withdrawn. Then the two ends of pipes should be brought together face to face so that the molten portions come in to contact with each other. Then the pipes should be drawn back very slightly (without separating the joined Molten portion) and then against the pipes should be pressed together with a moderate pressure of about 1 to 1.50 kg./cm . This ensures that the air bubbles are squeezed out. The pipes are to be held in that position until the pipe joints cools off naturally in atmospheric air. When a perfect joint is made, the rims cohere in such a way that there is only a very fine slight depression between the two rims. If the top surface of the rim is too flat, it will be because the pipe is overheated. If there is too much of depressions (groove) between rims, the pipe is under heated. The rims should not be cut off or erased from the joints. Also correct alignment of the pipes will help in joining the pipes perfectly as otherwise there will be reduction in the area of joining surface rendering the joint week and imperfect.
Sample 1
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