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"11B-4. PERFORMANCE AND DESIGN REQUIREMENTS. Contractor shall provide <br /> Pumping units designed for the following operating conditions and <br /> requirements: <br /> Well pump Well Pump <br /> Unit designation (EW-2) (EW-3) <br /> Number of units 1 1 <br /> Minimum shut-off head, feet 230 230 <br /> Capacity at operating head, gpm 15 7 <br /> Operating head, feet 150 150 <br /> Max pump operating speed at rated 3450 3450 <br /> head, rpm <br /> Minimum pump efficiency, percent 50 50 <br /> Min motor hp rating 3/4 1/2 <br /> Depth of well , feet 100 100 <br /> Min discharge outlet size, inches 1 1/4 1 <br /> Min hydrostatic test pressure, psi 1.5 shutoff 1 .5 shutoff <br /> head plus head plus <br /> suction pressure suction pressure <br /> Pump performance shall be stable and free from cavitation and noise <br /> throughout the specified operating head range at minimum suction <br /> submergences. The design running clearance between the impeller inlet <br /> and the casing wearing ring (if provided) shall be not less than 0.006 <br /> inch or one-half mil per inch of casing wearing ring diameter, whichever <br /> is greater. <br /> Each pumping unit shall be designed so that reverse rotation at rated <br /> head will not cause damage to any component. " <br />