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|  MIL-P-19131(SHIPS)
3.3.2 Shockproofness. -
3.3.2.1 All equipment shall be designed to withstand shock due to fixing of
the ship's own armament and noncontact underwater explosions of near-miss
aerial bombs, torpedoes, and mines. Every attempt shall be made to design the
equipment to resist shock as specified in 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 accelera-
tions 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 (0.2 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 accel-
erations 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 Specifica-
tion 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 condi-
tions.
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