S Document

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A-A-50561

3.2 Standard commercial product. The unit shall, as a minimum, be in accordance with the requirements of this CID and shall be the manufacturer's standard commercial product. Additional or better features which are not specifically prohibited by this CID, but which are a part of the manufacturer's standard commercial product, may be included in the unit being furnished. A standard commercial product is a product which has been sold or is being currently offered for sale on the commercial market through advertisements of manufacturer's catalogs, or brochures, and represents the latest production model.

3.3 Pump design and performance. Pumps shall be designed for the specified capacity, total dynamic head, type of fluid and viscosity of the fluid to be handled (see 7.2). The pumps shall be capable of continuously delivering its rated capacity at a pump efficiency of not less than 50 percent. The size of the pump and the operating speed shall be as recommended by the manufacturer for the specified operating conditions and viscosity. When specified (see 7.2), the pump casing or the stuffing box, or both shall be jacketed to permit transfer of heat from hot oil, hot water, or steam to the pumped fluid. Unless otherwise specified (see 7.2), the jacket shall be designed to withstand a saturated steam pressure of 125 psig (861.9 kPag) at 350 degrees Fahrenheit (°F) (177 degrees Celcius ( C)).

3.4 Pump driver. The pump driver shall be either an electric motor or a steam turbine.

3.4.1 Electric motor. Unless otherwise specified (see 7.2), electric motors shall be designed to operate on 208 volt, 3 phase, 60 Hertz alternating current. Electric motors shall conform to NEMA MG 1, and shall be rated for continuous duty with starting torque and speed rating suitable for the application.

3.4.1.1 Motor controller. Unless otherwise specified (see 7.2), a motor controller in accordance with NEMA ICS 2, general purpose, class A, with a type I enclosure shall be furnished. The controller shall be equipped with a manually operated on-off control and thermal overload protection. The controller characteristics shall be based on the intended application and shall be of the type normally provided by the manufacturer for the required service.

3.4.2 Steam turbines. Steam turbines shall conform to NEMA SM 23. Design pressure and temperature at turbine inlet and design pressure at turbine outlet nozzle shall be as specified (see

7.2.)

3.5 Pump and driver coupling. The connection between the pump and driver or reduction gear shall be of a closed-couple model or flexible coupling style.

3.6 Bedplate. Each pump and driver, and reduction gears when furnished, shall be bolted to a common bedplate of heavy cast iron or fabricated steel designed to withstand strains and to maintain pump, gears, and driver in alignment. The bedplate shall have a minimum of four bolt holes and a sufficient number of grouting holes for installation on a concrete foundation. There shall be a continuous drip channel around the four sides and a tapped drain connection. When pump sizes exceed 500 gpm, provisions shall be made for doweling both pump and driver after installation.