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|  MIL-D-18641F(SH)
4.4 Shock resistance. Shock tests shall be conducted as specified in MIL-S-901 with the
following modifications:
a.
Under the test procedure for medium weight equipment, the first blow in each group
shall be applied using the standard horizontal mounting adaptor; the second blow in
each group shall be applied with the unit mounted on adaptors holding it at a 30-
degree angle from the horizontal in the direction of its least transverse strength.
b. Shock test extension will be considered for units if they are of a similar design,
construction, weight, and materials to units which have successfully passed the test in
accordance with MIL-S-901. Shock test extension requests shall be prepared in
accordance with the instructions specified in MIL-S-901.
4.4.1 Shock resistance levels. As specified (see 6.2), shock resistance of distillation units shall
be in accordance with the following levels.
a.
Level A - The distillation unit, after sustaining mechanical shock, shall operate
normally (see 3.12) and no parts thereof shall create a missile hazard to personnel or
contiguous apparatus or otherwise constitute a personnel hazard (such as a rupture
of parts containing steam or hot water, with consequent danger of scalding personnel)
at the time of the shock.
b. Level B - The requirements of level B shall be the same as level A except that the
distillation unit need not operate normally after sustaining mechanical shock.
4.5 Vibration The distilling unit shall perform its function after the tests specified for type
I environmental vibrations of MIL-STD-167-1 (see 63).
4.6 Airborne and structureborne noise Airborne noise shall be measured in accordance with
MIL-STD-740-1 for grade D equipment. Structureborne noise shall be measured at the mounting
point in accordance with MIL-STD-740-2 (see 6.3).
4.6.1 Resilient mounts Equipment shall be mounted on resilient mounts even though they
may not be used in service.
4.6.2 Equipment shall be operating in the modes as specified (see 3.121 and 3.124).
4.7 Permanent tube plus Each permanent tube plug for saturated steam propelled surface
ship and submarine distilling plants shall be subjected to an internal hydrostatic test of not less
2
than 1000 lbs/in . Each plug shall be tight under this pressure and shall show no bulges, cracks,
flaws, porous places, or other harmful defects. In addition, each permanent tube plug for submarine
distilling plants shall also be given a 100 percent liquid penetrant inspection in accordance with
MIL-STD-271 on its outer surface after the hydrostatic test. The liquid penetrant inspection
standards shall be as follows:
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