MIL-P-17574D(YD)
ASME B 73.1M or API STD 610, as applicable, material and components, parts, and
accessories shall be compatible with liquid hydrocarbon products including
aviation gasoline, jet aircraft engine fuels, fuel oils, kerosene, and diesel
oils. Unless otherwise specified herein, all equipment, material, and articles
incorporated in the work covered by this specification are to be new.
3.5 Interchangeability. All systems of the same classification furnished
with similar options under a specific contract shall be identical to the extent
necessary to insure interchangeability of component parts, assemblies,
accessories, and spare parts.
3.6 Pump design and construction. The pump-engine system shall be designed
to withstand the strains, jars, vibrations, and other conditions incidental to
shipping, storage, installation, and operation. Unless otherwise specified (see
6.2), the pump shall have flanged connections in accordance with ASME B 16.1 for
class 125/250 and ASME B 16.24 for class 150/300, with a 6-inch intake and a
4-inch discharge connection. As required, flanged type eccentric reducers and
concentric increasers shall be provided. Discharge and intake sides of the pump
shall be conspicuously identified with arrow markings indicating flow, and at
least one of the sides, at the manufacturer's option, shall be conspicuously
identified by the word "DISCHARGE" or "INTAKE", as applicable. Symbols shall be
readily visible and cast integrally with the casing unless traced by welding
bead, cut into the casing or inscribed on a firmly attached brass or copper
plate. Unless otherwise specified (see 6.2), suitable flanged elbows shall be
furnished as required to permit installation of piping parallel to the axis of
pump rotation. The pump-engine system shall be complete so that when installed,
it can be used for any operation for which it was designed. The pump-engine
system shall be free of any characteristics or defects that will prevent it from
passing any of the inspections and tests specified in section 4.
3.7 Pump performance. Unless otherwise specified (see 6.2), the pump shall
provide a flow rate of 350 gallons per minute (gpm) against a total dynamic head
of 250 feet (ft), and a liquid suction head of 15 ft. The pump-engine system
shall meet the performance requirements specified when tested in accordance with
section 4 of this specification. The pump performance shall be met with the
engine speed controls set at an adjustment not exceeding that producing the net
continuous brake horsepower (bhp). To preclude the use of an overpowered
pump-engine system, the test shall be met but not exceeded by more than
20 percent while the engine speed controls are set at an adjustment not less
than that producing 60 percent of the net continuous bhp. The pump efficiency
shall be not less than 60 percent in meeting the specified performance
requirements. The design shall be such that the pump shall not cavitate or tend
to cavitate while pumping fresh water at 100 degrees Fahrenheit (°F) at
sea-level conditions.
3.8 Diesel engine. The diesel engine shall be a standard 2- or 4-cycle
engine. The continuous horsepower output-shaft rating shall be sufficient to
meet the input requirements of the pump without exceeding the engine
manufacturer's published continuous bhp rating for the speed at which the engine
will normally operate. The engine shall be furnished complete with all
accessories normally supplied as standard equipment including a governor, oil
filter, air cleaner, muffler, and fuel tank.
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