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MIL-P-18472G(SH)
(a)
Endurance test (see 4.6.3.1).
(b)
Shock test (see 4.6.3.2).
(c)
Inclined operation test (see 4.6.3.3).
(d)
Vibration test (if specified in 6.2) (see 4.6.3.4).
4.6.3.1 Endurance test.  The pump shall be operated for a period of not
less than 500 hours of actual running time with a minimum of 100 starts to ascer-
tain reliability of performance and operation.  The endurance test for distilling
plant pumps on ships which do not have steam propulsion plants shall be of a
period of not less than 100 hours of actual running time with a minimum of 25
starts.  Other requirements in 4.6.3.1.1 through 4 6.3.1.6 are applicable except
that acceptance criteria shall be based on 100 hours of operation.
4.6.3.1.1 Prior to commencement of the endurance test and immediately after
completion of the endurance test, the pump shall be disassembled to the extent
necessary and the critical dimensions and running clearance, or parts subject to
wear, erosion and derangement, measured, calculated and recorded.  Components
such as pump impellers and casing subject to erosion, corrosion, cavitation, and
wear, the effects of which are not subject to routine measurement shall be listed
in the inspection record and after completion of the test the condition of each
component shall be determined and recorded.
4.6.3.1.2 During the initial and final hours of the endurance test run,
capacity and noise test in accordance with 4.6.1,4 and 4.6.2.1 shall be performed
to determine the changes in the pump's performance characteristics and noise
signature.  Vibration measurements shall be taken at the bearing caps or housing
of the pump and driver at equal speeds during the initial and final capacity test
to determine the changes in mechanical operation.
4.6.3.1.3 The endurance test shall not be continuous but shall be inter-
rupted by at least three rest periods of approximately 8 hours each.  The number
of starts specified in 4.6.3.1 at full line voltage shall be performed during the
course of the test.  During an early part of the endurance test the pump shall be
operated continuously for 24 hours at a capacity as near free delivery as
possible at maximum rated speed, and normal specified temperature, submergence
and suction conditions.  During the latter part of the endurance test the pump
shall be operated as near shutoff as possible for 12 hours continuously.  The
remainder of the endurance test shall be run at maximum speed and within plus
20F, minus OF of maximum specified liquid temperature for one half of the
remaining time and at the maximum rated speed and within plus OF, minus 20F of
the minimum specified liquid temperature the other half of the remaining time.
The pump shall be operated at one-third, two-thirds, and rated capacity in
approximately equal time intervals with the liquid at the maximum specified
liquid temperature for one half of each portion and at the minimum specified
liquid temperature for the other half of each portion. Flow control shall be
achieved in a manner which simulates system operation, that is, submergence
control or throttling of discharge, as specified (see 6.2).  Operation shall be
at minimum specified net positive suction head or submergence, or maximum suction
lift or vacuum as applicable (see 6.2) for all operating temperatures.
31

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