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• Station Duty Points <br /> Design Point Required Pressure Pump Operation Minimum <br /> Description Flow(gpm) TDH (ft)' Boost(psi) Configuration Efficiency (%) <br /> Max Flow/Min 2 810 110 48 2 Large Pumps 85% <br /> Suction Pressure <br /> Reduced Flow 1 1,880 98 43 2 Large Pumps 70% <br /> Reduced Flow 2 1,210 77 34 1 Large Pump 82% _ <br /> Low Flow 605 57 and lower 2+1: 1 Large Pump 74% <br /> 25 and lower <br /> 3+1: Jocke Purr'. <br /> • Pump type/configuration: SPECIFY IN QUOTE <br /> o Propose recommended pump type/configuration <br /> o Submit pump curves to demonstrate ability to meet design points within clearly <br /> denoted manufacturer's recommended operating limits without damaging vibration or <br /> cavitation <br /> • Station Operation <br /> o Station will operate to maintain an operator-set adjustable discharge pressure,with <br /> available suction pressures ranging from 35 to 60 psi. <br /> o When called to operate,the station shall initially utilize the jockey pump at a speed <br /> required to maintain discharge pressure, unless the jockey pump is not available(failed <br /> or locked out of operation). If the jockey pump is not available for operation,the station <br /> shall begin operation with a large pump. <br /> o When the jockey pump is unable to meet pressure requirements at full speed,the <br /> station shall smoothly transition to a single large pump operation, resulting in the jockey <br /> pump being removed from operation. The large pump shall start at minimum speed (as <br /> recommended by the manufacturer)and ramp up the speed required to meet pressure <br /> requirements. <br /> o When a single large pump is unable to meet pressure requirements at full speed,the <br /> second large pump shall be called.The transition to two pump operation shall be <br /> smooth: operating pump shall ramp down to minimum speed as second pump starts at <br /> minimum speed (as recommended by the manufacturer based on the supplied pumps) <br /> and both pumps shall ramp up together at identical speed to meet pressure <br /> requirements. <br /> o The same operation shall apply when a third duty pump is brought into operation with <br /> the two operating pumps. <br /> o When the station pressure transducers sense pressure rising above the discharge <br /> pressure set point, pumps speed shall be reduced and individual pumps shall be taken <br /> out of operation and required to maintain the pressure set point.As the operating <br /> pumps are ramped down to minimum speed,one duty pump shall be turned off and the <br /> remaining pumps shall ramp up to maximum speed,then speed shall be reduced as <br /> needed to meet the pressure set point. <br /> o Lead pump shall alternate amongst the duty pumps automatically to equalize run time. <br /> City of Pleasanton <br /> RW Booster Station Request for Quotation 3 <br />