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|  MIL-P-52405C
3.6 Transpo rtability.
3.6.2 Slinging provisions. The slinging provisions shall conform to
MIL-STD-209. The provisions shall enable the complete pump to be lifted in the
normal operating position. The previsions shall be located so that not less than
1-inch clearance is maintained between slings and all exterior parts and shall be
fastened to members which will withstand stresses in the amount and direction of
pull specified for the provisions without weld failure, permanent deformation,
cracking, loosen ing, or breaking of the provision or its connecting structural
components. Slinging provisions may also be used as tiedown provisions when such
provisions meet the requirements specified in 3.6.1. All Slinging/tiedown
provisions shall be labeled "LIFT", "TIEDOWN", or "LIFT/TIEDOWN", as applicable,
in 1-inch (2.54 cm) high letters.
3.6.3 Rail transportability. The pump shall be rail transportable in CONUS
and NATO countries without restrictions. The pump shall have a dimensional
profile within the Gabarit International de Chargement (GIC) in accordance with
MIMC/TEA pamphlet 70-1, outline diagram when loaded on a 50-inch (127 cm) high
rail car. The pump shall be capable of withstanding shock loads resulting from
rail impact testing in accordance with 4 .5.2.7 without failure, damage, or
permanent deformation. A transportability report is required (see 6.7).
3.7
Performance.
3.7.1 Hydrostatic pressure. The pump shall withstand an internal hydrostatic
pressure of not less than 1.5 times the shutoff head for a period of not less
than 3 minutes without leakage or permanent deformation.
3.7.2 Impeller balancing. The impeller shall be dynamically balanced. The
dynamic "out-of-balance" condition shall be not more than the following:
0.025 ounce-inch for class A, B, D, and E pumps
0.050 ounce- inch for class C, F, and G pumps.
3.7.3 Type I, integral self-priming.
The pump shall be an integral self-
priming centrifugal pump (after the pump case has been initially filled).
3.7.3.1 Class A pump. The pump shall be provided with a semi-open impeller.
The suction and discharge ports of the pump shall be internally threaded 2-inch
NPT. The discharge port shall be vertical and shall be located at the top of the
pump case. The pump shall deliver not less than 200 gpm at 50-foot total head
when operated at a speed of not more than 3,600 rpm and using a 10-foot static
Suction lift.
3.7.3.1.1 Check valve. A check valve shall be provided on the suction inlet
of each pump. When subjected to a maximum pressure equal to the shutoff head of
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