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Preliminary Design Memorandum <br /> Silt Pumping Plant Rehabilitation <br /> operators have taken them off with detrimental impacts to the piping and <br /> equipment. <br /> • Motors custom designed for the additional flywheel loads are required. <br /> One District operating a Reclamation designed project recently added the <br /> original flywheel to a standard replacement motor. The motor broke its <br /> frame immediately upon startup and was not repairable. <br /> • A flywheel will not provide any protection from hydraulic transients <br /> caused by discharge valve operational mistakes. <br /> Air Chamber <br /> Advantages: <br /> • Proactive hydraulic transient mitigation (immediately reduces <br /> hydraulic transient pressure wave development in the pipe when a <br /> change in velocity occurs)for all normal starts and stops, <br /> emergency and shutdown cases. <br /> • Will provide a significant level of protection to the system if <br /> discharge valves are operated outside of the prescribed timing. <br /> Disadvantages: <br /> • Air compressor and control system maintenance is required. <br /> • Air chamber interior and exterior paint systems must be <br /> maintained. <br /> • Exterior air chamber location is exposed to vandalism. <br /> • Interior air chamber location takes up room in the plant. <br /> Recommendation: Perform the hydraulic transient mitigation analysis early in <br /> the design process to determine a recommended hydraulic transient mitigation <br /> solution for this particular project. If an air chamber is determined to be the best <br /> hydraulic transient mitigation device,consider a bladder style of air chamber. The <br /> bladder air chamber does not require a dedicated compressor. <br /> 24 <br /> FOR OFFICIAL USE ONLY <br />