2000-090 - Laserfiche WebLink

Home Browse Search

17' r 40 f G. When laying is not in progress, including lunchtime, the open ends of the pipe shall be closed by fabricated plugs, or by other approved means. H. Pipe shall be stored on clean level ground to prevent undue scratching or gouging. The handling of the pipe shall be in such a manner that the pipe is not damaged by dragging it over sharp and cutting objects. The maximum allowable depth of cuts, scratches or gouges on the exterior of the pipe is 10 percent of wall thickness. The interior pipe surface shall be free of cuts, gouges or scratches. 1. sections of pipe with Cuts, scratches or gouges exceeding five percent of the pipe wall thickness shall be removed completely and the ends of the pipeline rejoined. D. The pipe shall be joined by the method of thermal butt fusion, as outlined in ASTM D2657. All joints shall be made in strict compliance with the manufacturer's recommendations. K. Mechanical connections of the polyethylene pipe to auxiliary equipment such as valves„ pumps and tanks shall be through flanged connections which shall consists of the following: I. A polyethylene flange shall be thermally 'butt -fused to the stub end of the pipe. A carbon steel back-up ring shall be used on both sides of the connection prior to thermally butt - fusing the polyethylene flange. 2. A 316 stainless steel back up ring shall mate with a 316 stainless steel flange. 3, Ductile iron back up rings shall mate with cast iron flanges L. Flange connections shall be provided with a full -face neoprene gasket. M. All HDPE pipe must be at the temperature of the surrounding soil at the time of backfilling and compaction. I P. No single piece of pipe shall be laid unless it is straight. The eemerline of the pipe shall not deviate from a straight line drawn between the centers of the openings at the ends of the pipe by more than 1116 -in per foot of length. If a piece of pipe fails to meet this requirement t check for straightness, it shall be rejected and removed from the site. Laying instructions of the manufacturer shall be explicitly followed. Q. If a defective pipe is discovered after it has been installed, it shall be removed and replaced with a sound pipe in a satisfactory manner at no additional cost to the Owner. All pipe and fittings shall be thoroughly cleaned before installation, shall be kept clean until they are used l in the work and when laid, shall confornt to the lines and grades required. R. As soon as the excavation is complete to normal grade of the bottom of the trench, bedding 1 shall be placed, compacted and graded to provide firm, uniform and continuous suppnrt for ! the pipe. Bell holes shall be excavated so that only the barrel of the pipe hears upon the bedding. The pipe shall be laid accurately to the lilies and grades indicated on the Drawings. Blocking under the pipe will not be permitted, Bedding shall be placed evenly on each side of the pipe to mid -diameter and hand tools shall be used to force the bedding under the haunches of the pipe and into the bell holes to give firm continuous support far the pipe. Bedding shall then be placed to 12 -in above the top of the pipe. The initial Meet of backfilt �. above the bedding shall be placed n l -ft layers and carefully compacted. Generally the compaction shall be done evenly on each side of the pipe and compaction equipment shall not be operated directly over the pipe until sufficient backfill has been placed its ensure that such 15080A - 5 tooh tensity Palyethytrnc Pipe (IIPPE1 [1..•..u..w,o.r,a,ecgrn,..iN�[,rater'ir.rr+Y�sr+�rIfOw4•t4�%tl+wrtthYrMwM.-Frtxtll�