MIL-P-52144E(ME)
3.13 Performance. The pumping assemblies, type I and type II, shall prime
within 2 minutes, and deliver either liquid hydrocarbon fuels, having a specific
gravity of 0.75, or water, having a specific gravity of 1.0 at not less than 350
gallons per minute (gpm) against a total dynamic head of 275 feet at 2400 revol-
rpm. The maximum net positive suction head (NPSH)
utions per minute (rpm),
requirements shall not exceed 8 feet at 350 gpm at 275 feet total head at the
operating speed of the pumping assembly. The pumping assembly shall develop a
peak efficiency of not less than 63 percent.
3.13.1 Performance data chart. A performance data chart approximately 8.5 x 11
inches shall be furnished. The chart shall show the complete performance
characteristics of the pumping assembly operation when operating at 2400 rpm and
pumping liquid petroleum fuel having a specific gravity of 0.75 or water having a
specific gravity of 1.0. All data shall be derived from the actual perfor-
mance of the first article model. The curves will be plotted as total head, feet,
US capacity, US gallons per minute. The additional scales will be presented to
show the total head as psi of 1.0 and 0.75 specific gravity fluid. The chart
shall be a photosensitive anodized aluminum plate conforming to MIL-P-514. The
chart shall be located on the outside of the toolbox.
3.14 Pump. The pump shall be centrifugal and self-priming. The pump housing,
check valve discharge housing, discharge housing, discharge pipe, and manifold
inlet shall be high-strength aluminum alloy. Aluminum castings shall be uniform
in quality and condition, free from cracks, hard spots, porosity, shrinkage
defects, misplaced coring, and other defects which may affect the intended use.
3.14.1 Hydrostatic pressure. The pumping assembly, with the 4-inch valves
completely open and with the quick-disconnect fitting covers in place, shall
withstand an internal hydrostatic pressure of 200 pounds per square inch (psi) for
not less than 5 minutes without rupture or distortion to any component, and
without any leakage through the pump, fittings, piping, or joints.
3.14.2 Pump housing. The pump housing shall be provided with a provision for
filling the pump housing without removal of the suction or discharge connections,
and a drain port and plug capable of passing 0.25 inch solids at its lowest point
for removing sediment and for draining the case without tilting.
The impeller shall be as specified on the drawings.
3.14.3 Pump impeller.
3.14.3.1 Impeller balance. The impeller shall be dynamically balanced to a
maximum out-of-balance condition of 0.25 inch-ounce at 2400 rpm.
3.14.4 Pump shaft seal. The pump shaft seal shall be a self-lubricating
mechanical seal that will permit operation of the pumping assembly at any
operating condition specified herein.
3.14.5 Valves (suction and discharge). The pumping assembly shall be equipped
with four 4-inch valves as specified herein. The valves shall be secured to the
frame of the unit or auxiliary members secured thereto. The discharge of the pump
shall be manifolded into two 4-inch valves. Suction couplers and discharge
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