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|  MIL-P-18682D(SH)
4.6.6.3.1 Test reports for the performance evaluation tests shall be
compiled into a single document. The document shall identify the pump by
manufacturer's serial numbers of pump and driver, the contract or order number
under which the tests were performed, the ship or class of ships for which the
pump is intended if known, and the letter and date of test procedure approval.
The test compilation document shall be distributed as specified (see 6.2.2).
4.6.7 Design evaluation tests. One pump of each type, design, and size
complete with the driver and all appurtenances and controls shall successfully
undergo the design evaluation tests specified herein. Design changes which in
the opinion of the design review agency may detrimentally affect the reliability
of a previously tested and accepted pump design shall be cause to require new
design evaluation tests in part or in full. It shall be at the discretion of the
design evaluation tests when an accumulation of several design changes, each of
itself apparently not significant to pump reliability, collectively considered
render suspect the validity of any one or all or the previously performed design
evaluation tests. An endurance test need not be performed provided that the
vendor can demonstrate to the satisfaction of the design review agency concerned
that the pump to be offered has been proven in previous Navy shipboard service
under conditions equally as strenuous as those specified in the ordering data.
The proposed design evaluation test procedures shall be submitted for approval
to the contracting activity prior to performing the tests. The design evaluation
tests shall consist of the following:
(a)
Endurance test (see 4.6.7.1).
(b)
Shock test (see 4.6.7.2).
(c)
Inclined operation test (see 4.6.7.3).
(d)
Vibration tests (if specified (see 6.2.1)) (see 4.6.7.4).
(e)
Experimental stress analysis (see 4.6.7.5).
4.6.7.1 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
ascertain reliability of performance and operation.
4.6.7.1.1 Prior to commencement of the endurance test and immediately
after completion of the 500-hour operating run, the pump shall be disassembled
to the extent necessary and the critical dimensions and running clearance of
parts subject to wear, erosion and derangement, shall be measured, calculated
and recorded. Components such as pump impellers and casings 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 determined and recorded.
4.6.7.1.2 During the initial and final hours of the endurance test run,
noise and performance tests in accordance with 4.6.4 and 4.6.6.1 shall be
performed to determine the changes in the pump's performance characteristics
and noise signature. Vibration measurements shall be taken at the bearings
caps or housings of the pump and driver at equal speeds during the initial and
final capacity test to determine the changes in mechanical operation.
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