MIL-P-18140(SHIPS)
3.3.1 The pumps shall operate in a manner satisfactory to the bureau or agency concerned when
inclined as follows:
(a) Up to 15 degrees to either side (permanently inclined).
(b) With the vessel rolling up to 45 degrees from the vertical to either side
(c) With the vessel pitching 10 degrees up and down from the normal hori-
zontal plane.
3.3.2 Shockproof ness. -
3,3.2.1 All equipment shall be designed to withstand shock due to firing of the ship's own armament
and non'- contact underwater explosions of near-miss aerial bombs, torpedoes, and mines. Every attempt
shall. be made to design the equipment to resist shock as specified by graphs, A, B, and C, shown on
figure 1, it being understood that these shocks are applied at the footings of the component, Shockmounts
shall not be used unless bureau or agency concerned approval of the mount and its proposed application is
given.
3.3.2.2 Equipment shall be designed to resist shock by using the accelerations specified on the
graph shown on figure 1 for determining shock forces. The determination of stresses resulting from
these forces is accomplished by the application of the usual methods of analytical mechanics. The
allowable stress in components due to shock shall be the yield strength (O. 2 percent offset) of the material.
Normal stresses in parts, such as the tensile stress in a bolt due to initial pull-up, shall not be added to
the shock stresses, It is of paramount importance that the accelerations shown on the curves of figure 1
be utilized in the design of holding down bolts, supporting feet or lugs and main structural members of
the equipment and that no failure or permanent deformation occur as a result of shock, Components of
an assembly mounted on a common rigid base need not be designed for higher accelerations than the
values for which the whole assembly is designed unless the designer has reason to believe that higher
accelerations will be experienced by the components.
3.3.2.3 The design of all complete pump units shall be such that they are capable of passing the high-
impact shock test specified in Specification MIL-S-901.
3.3.2,4 Bolts designed to be stressed in shear shall be installed in holes with a minimum of
clearance, as experience indicates that large clearances allow impacting and subsequent failure.
3.3.3 Alignment between separate components of a unit shall, in general, be maintained by means
of keyways or other adequate means.
3.3.4 In no case shall a piece of equipment be rigidly supported from more than one plane.
3.3.5 The design, construction, and workmanship, of the equipment shall be such that a minimum
practical noise level will result under all operating conditions.
3.3.6 The pumps shall be self-priming and capable of removing air from the suction lines, The
pumps may at times be required to handle oils lighter than those specified, water, sediment and sludge,
such as may settle out and accumulate in the bottom of tanks: Hence, where the lubrication of the pump
is supplied by the fluid pumped, the bearings, rotors, and gears shall be of such design and materials
that the pumps will operate in a manner satisfactory to the Bureau of Ships when pumping such fluids
for limited periods (see 4. 2).
3.3.7 Mounting. -
3.3.7.1 Pump units shall be horizontally or vertically mounted, as specified (see 6. 1).
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