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|  MIL-P-52405C
the pump, the valve shall prevent siphoning of water from the pump case and shall
not leak or show permanent deformation of the body, cover, seat, or any of its
components.
3.7.3.1.2 Priming. When operating at conditions equivalent to standard sea
level atmospheric conditions (sea level atmospheric conditions of 29.92 inches of
mercury and water with a specific weight of 62.3 pounds per cubic foot at a
temperature
the pump shall prime in not more than 2 minutes under a
10-foot, static suction lift. The suction and discharge fittings shall be of the
same nominal size as the suction and discharge ports of the pump.
3.7.4 Type II, straight centrifugal. The pump shall be a straight centrifugal
pump and shall be provided with an enclosed impeller. The pump stroll be provided
with suction and discharge flanges conforming to ANSI B16. 1, class as specified
herein. The pump discharge port shall be capable of being located in any one of
four positions (vertical upward, horizontal to the left, vertical downward and
horizontal to the right). The pump case shall be provided with drain ports and
plugs. The ports and plugs shall be as specified in 3.4.2. The drain ports
shall be located so as to completely drain the pump case in not more than 2
minutes when the discharge port is mounted in any one of its four positions.
3.7.4.1 Class B pump. The pump shall be provided with a 1-1/2 inch flanged
suction and a 1-1/4-inch flanged d" scharge. The pump suction and discharge
i
flanges shall be cast integrally with the pump case or rover, as applicable. The
discharge opening shall be positioned vertically upward andd shall be on the right
side of the pump case when viewed from the pump end. The pump shall deliver not
less than 25 gpm at 115-foot total head when operated at a speed not more than
3,600 rpm and using a suction lift equivalent to 10 feet.
3.7.4.2 Class C pump. The pump shall be provided with a 5-inch flanged
suction connection and a 4-inch flanged discharge connection. The pump suction
and discharge flanges shall be cast integrally with the pump case or rover, as
applicable. when viewed from the pump end, the discharge lange shall be located
f
at the top of the pump case and shall be horizontally to the left. The pump
shall deliver not less than 750 gpm at 50-foot total head when operated at a
synchronous speed of not more than 3,600 rpm and using a static suction lift
equivalent to 10 feet.
3.7.4.3 Class D pump.
The pump shall be provided with 1-1/2 inch screwed or
integrally cast flanges rated to exceed the maximum pressure of the pump. When
viewed from the pump end, the discharge flange shall be located at the top and
discharge liquid to the left. The pump, when connected to a 60Hz power source,
shall deliver not less than 70 gpm at a total head of 165 feet with a suction
lift equivalent to 10 feet.
3.7.4.4 Class E pump.
The pump shall be provided with 2-inch screwed or
integrally cast flanges rated to exceed the maximum pressure of the pump. When
viewed from the pump end, the discharge flange shall be located at the top and
discharge liquid to the left. The pump shall deliver not less than 125 gpm at a
total head of 165 feet with a suction lift equivalent to 10 feet.
3.7.4.5 Class F pump.
The pump shall be provided with 4-inch screwed or
integrally cast flanges rated to exceed the maximum pressure of the pump. when
viewed from the pump end, the discharge flange shall be located at the top and
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