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' inch plastic and was damaged by excavation. The gas pipe was not ruptured, but was <br />bent and distorted. Public Service Co. of Colorado performed the repair. <br />The Storke pipeline was installed generally as designed. Only small changes to <br />the alignment had to be made to clear obstacles. <br />Stainless Steel Piping <br />In the PT, a fairly short section (about 50 feet) of 20-inch and 16-inch diameter <br />316 stainless steel piping was installed. Stainless steel piping was used at this location <br />because it is possible that a pigging station will be installed here in the future. The <br />stainless steel piping has a tee section available to connect a pig launcher if it is <br />required. This section of pipe also has isolation valves, a drain, taps for installing <br />.pressure gauges, and a hydrostatic test pump connection. Certified welders were used <br />to fabricate this piping. <br />Air Chamber <br />A 4 feet diameter by 10 feet long, 316 stainless steel, ASME coded air chamber <br />was installed in the PT, close to the pumps located in #5 Shaft. This chamber acts to <br />absorb and dissipate any pressure surges that might occur in the pipeline due to a <br />_ sudden pump shutdown. The chamber is connected to an air compressor, which keeps <br />it, pressurized. The water level in the chamber is controlled to within a small range in the <br />center of the tank by a level control mechanism that adds air to, or bleeds air from the air <br />chamber to maintain the water level in the correct range (approximately YZ full of water). <br />This chamber is connected to the existing 16-inch HDPE pipeline in the PT by a <br />10-inch diameter stainless steel pipe. Between two of the flanges at the bottom <br />connection to the chamber, a nozzle was installed to help the water quickly flow out of <br />the chamber under low surge pressures, and slightly restrict the flow of water back into <br />the chamber. <br />8 <br />