//H. Submit training plans and instructor qualifications in accordance with the requirements of Section 22 08 00, COMMISSIONING OF PLUMBING SYSTEMS.// 1.5 QUALITY ASSURANCE A. General: 1. UL Compliance: Comply with UL 778 for water pumps. 2. Design Criteria: a. Pump sizes, capacities, pressures, operating characteristics and efficiency shall be as scheduled. b. Headcapacity curves shall slope up to maximum head at shutoff. Select pumps near the midrange of the curve, and near the point of maximum efficiency, without approaching the pump curve end point and possible cavitation and unstable operation. Select pumps for open systems so that required net positive suction head (NPSHR) does not exceed the net positive head available (NPSHA). c. Pump Driver: Furnish with pump. Size shall be nonoverloading at any point on the headcapacity curve, including in a parallel or series pumping installation with one pump in operation. d. Provide all pumps with motors, impellers, drive assemblies, bearings, coupling guard and other accessories specified. Statically and dynamically balance all rotating parts. e. Furnish each pump and motor with a nameplate giving the manufacturers name, serial number of pump, capacity in GPM and head in feet at design condition, horsepower, voltage, frequency, speed and full load current and motor efficiency. f. Test all pumps before shipment. The manufacturer shall certify all pump ratings. g. After completion of balancing, provide replacement of impellers or trim impellers to provide specified flow at actual pumping head, as installed. B. Hot Water Circulating and Recirculating Pumps: Components shall be assembled by a single manufacturer and the pump motor assembly shall be the standard cataloged product of the manufacturer. C. Domestic Water Pressure Booster System: 1. Components shall be furnished by a single manufacturer and the system shall be the standard cataloged product of the manufacturer. 2. Shop Test: Water booster unit and its component parts shall undergo a thorough electric and hydraulic operating test prior to shipment.
//H. Submit training plans and instructor qualifications in accordance with the requirements of Section 22 08 00, COMMISSIONING OF PLUMBING SYSTEMS.// 1.5 QUALITY ASSURANCE A. General: 1. UL Compliance: Comply with UL 778 for water pumps. 2. Design Criteria: a. Pump sizes, capacities, pressures, operating characteristics and efficiency shall be as scheduled. b. Headcapacity curves shall slope up to maximum head at shutoff. Select pumps near the midrange of the curve, and near the point of maximum efficiency, without approaching the pump curve end point and possible cavitation and unstable operation. Select pumps for open systems so that required net positive suction head (NPSHR) does not exceed the net positive head available (NPSHA). c. Pump Driver: Furnish with pump. Size shall be nonoverloading at any point on the headcapacity curve, including in a parallel or series pumping installation with one pump in operation. d. Provide all pumps with motors, impellers, drive assemblies, bearings, coupling guard and other accessories specified. Statically and dynamically balance all rotating parts. e. Furnish each pump and motor with a nameplate giving the manufacturers name, serial number of pump, capacity in GPM and head in feet at design condition, horsepower, voltage, frequency, speed and full load current and motor efficiency. f. Test all pumps before shipment. The manufacturer shall certify all pump ratings. g. After completion of balancing, provide replacement of impellers or trim impellers to provide specified flow at actual pumping head, as installed. B. Hot Water Circulating and Recirculating Pumps: Components shall be assembled by a single manufacturer and the pump motor assembly shall be the standard cataloged product of the manufacturer. C. Domestic Water Pressure Booster System: 1. Components shall be furnished by a single manufacturer and the system shall be the standard cataloged product of the manufacturer. 2. Shop Test: Water booster unit and its component parts shall undergo a thorough electric and hydraulic operating test prior to shipment.
VA221123.docx