MIL-PRF-53051B
static suction lift equivalent to 10 feet at sea level and atmospheric conditions of 29.92 inches of
mercury, using water with a specific weight of 62.3 pounds per cubic foot at 68 °F.
3.5.4 Pump characteristics and accessories. All pumps shall contain drain plugs large enough
to allow complete pump draining in less than one minute. All threaded parts shall conform to
ASME B 1.1 or ASME B 1.20.3, as applicable.
3.5.4.1 Type I case and volute. Type I pumping assembly case and volute shall be one piece.
The cutwater shall be integrally cast into the pump case. The case shall have a pump drain and a
1.50 inch priming port with a check valve. The priming port shall be equipped with a male, quick
disconnect, coupling and dust cap in accordance with ASTM F 1122, standard class.
3.5.4.2 Type II case and volute. Type II pumping assembly case and volute shall be one piece.
The cutwater shall be integrally cast into the pump case. The case shall have a pump drain and a
1.50 inch priming port with a check valve. The priming port shall be equipped with a male, quick
disconnect, coupling and dust cap in accordance with ASTM F 1122, standard class.
3.5.4.3 Impeller and wear rings. The impeller and wear ring shall be fabricated of inherently
compatible materials, in a combination suitable for intended service.
3.5.4.4 Seals. The pump shall be equipped with self-lubricating, mechanical seals that will not
be damaged or compromised by operation of the pumping assembly under any condition specified
herein.
3.5.4.5 Piping and fittings. All piping, valves, and fittings on the suction and discharge of the
pumping assemblies shall be flanged except as specified herein. All piping and fittings shall be
mounted securely and shall withstand an internal working pressure of 1.5 times the shutoff
pressure, at rated speed without leaking or becoming deformed. The discharge piping shall
contain a 0.25 inch National Pipe Thread (NPT) vent valve to remove air during priming. The
vent shall be located at the highest point in the discharge piping and the vent valve shall be routed
to the exterior of the pump and engine housing for easy accessibility.
3.5.4.6 Type I, size 1, and type II, size 1. Type I, size 1, and type II, size 1, pumping
assemblies shall have the following suction and discharge components:
a. Two four-inch gate valves shall control the suction of the pump. The gate valves shall
be in accordance with MSS SP-80, except that materials for type I shall be a durable,
rigid, lightweight, corrosion resistant, non-magnetic material, suitable to the application
and compatible with aluminum. The valves shall be supported by a bracket connected
to the pumping unit frame. One of these valves shall be in line with the inlet of the
pump. Suction couplers shall be four-inch, female, quick disconnect couplings,
gaskets, and dust plugs in accordance with ASTM F 1122, standard class, and shall be
slanted downward 30° from the horizontal.
b. The discharge of the pump shall be manifolded into two, four-inch gate valves. The
gate valves are to be in accordance with MSS SP-80, except that materials for type I
shall be a durable, rigid, lightweight, corrosion resistant, non-magnetic material,
suitable to the application and compatible with aluminum. The valves shall be
supported by a bracket connected to the pumping unit frame. Discharge couplers shall
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