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Section 15072 <br /> HIGH DENSITY POLYETHYLENE PIPE <br /> involved. Butt fusion joining shall yield a joint strength equal to or greater than the tensile <br /> strength of the pipe. <br /> Flanged joining, or other mechanical joining methods specified, may be used to make <br /> connections to differing piping materials, to equipment, valves and other appurtenances, and <br /> where specified. <br /> C. Trench Excavation <br /> Trenches shall be excavated to ensure that sides will be stable under all working conditions. <br /> Trench walls or supports shall comply with all local and national standards for safety. <br /> D. Location and Alignment <br /> Pipe and fittings shall be placed in the trench with the invert conforming to the elevations, <br /> slopes, and alignments shown. <br /> E. Bedding and Backfill <br /> Materials used for bedding and backfill shall be as specified in Section 02210, <br /> EXCAVATION, BACKFILLING, AND COMPACTION FOR UTILITIES, and as shown. <br /> Place materials by methods that will not disturb or damage the pipe. All HDPE pipe shall be <br /> at the temperature of the surrounding soil at the time it is backfilled and compacted. Work <br /> in and tamp the bedding material in the area under the pipe and up to the spring line before <br /> placing and compacting the remainder of the embedment. Blocking under the pipe shall not <br /> be permitted. <br /> Use compaction equipment and techniques that are compatible with materials specified and <br /> location in the trench. Before using heavy compaction or construction equipment directly <br /> over the pipe, place sufficient backfill to prevent damage, excessive deflections, or other <br /> disturbances of the pipe. <br /> 3.03 TESTING <br /> A. General <br /> Testing of piping shall be as specified in Section 15060, PIPING SYSTEMS, and this <br /> section. In case of conflict, the requirements of this section shall prevail. <br /> B. Hydrostatic Pressure Testing <br /> 1. General: HDPE piping systems shall be fully pressure tested prior to covering the <br /> piping and placing the line into service. Water shall be the test medium for <br /> hydrostatically testing the pipe. Test procedures shall be as specified in Section 15060, <br /> Walnut Grove Sewer Project(Conformed) 15072-5 SAO]60401 <br /> March 2008 n:Vsa0160401\specs\wg con formvdiv 15vI5072.doc <br />