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Preliminary Design Memorandum <br /> Silt Pumping Plant Rehabilitation <br /> discharge valves could be another source of vacuum leaks. The valve seats, seals and stem <br /> packing should be inspected for excessive wear. <br /> Alternatives Considered: <br /> • Gravity fill from common storage tank <br /> • Self-priming pumps <br /> • Dual (suction and discharge) interconnected priming tanks for each pump <br /> • Vacuum priming system <br /> Description <br /> 13 <br /> FOR OFFICIAL USE ONLY <br />