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|  MIL-P-17840C(SH)
(d) Adjustments made.
(e) Changes made in the conditions or method of operation.
4.6.8.5 Endurance test acceptance criteria:
(a)
The head-capacity curve at maximum rated speed after 5OO hours
of pump operation shall conform to the specification requirements
and shall show no abnormal deviations from the curve before the
500-hour test.
The unit performance and operation after 500 hours of operation
(b)
shall be unchanged and normal and meet all specification
requirements.
(c)
The unit operation at the end of the endurance test shall be
smooth and in conformance with the specification.
The leakage rate from a mechanical seal shall not exceed 5 drops
(d)
per minute..
(e)
Running clearances shall be normal.
(f)
Components subject to attack from corrosion, erosion, and cavita-
tion shall be in a condition commensurate with 500 hours of
service.
Wear rates for wearing parts critical for proper operation shall
(g)
shall a rate of wear for the test period that shall be consistent
with the specified design life requirements.
No failures shall have occurred throughout the 500-hour test.
(h)
4.6.8.6 Post endurance test procedure. The unit subjected to the 500-
hour endurance test shall be restored to the asnew condition by replacement
of all parts worn beyond the as-new design tolerances. The restored unit shall
pass the tests specified in 4.6.2, 4.5.3, and, if applicable, 4.6.9 The test
documentation shall indicate that the unit was subjected to the endurance test
and subsequently restored and tested and that it shall be certified as fully
conforming to the specification for unrestricted service.
4.6.9 Airborne and structureborne noise tests. When specified (see
6.2.1), pumps shall undergo an airborne noise test--conducted and reported in
accordance with MIL-STD-740. The noise test stand details, instrumentation,
and testing techniques shall be submitted by the contractor for review by the
contracting activity prior to the test commencement. Noise tests shall be
performed with the driver furnished with the pump.
Acceptance criteria:
(a) Airborne noise. The unit shall meet the airborne noise level
limits specified. If the first three production units of the
contract or order are 10 decibels (dB) lower in all octave
bands than those specified, and providing all production units
comply with the balance requirements of MIL-STD-167-1, type II
or the structureborne noise levels specified in the contract or
order (see 6.2.1), then airborne noise testing need not be
conducted on the remaining units of the contract or order.
(b) Structureborne noise. When required, the unit shall meet the
structureborne noise level limits specified in the contract or
order (see 6.2.1). If specific structureborne noise levels are
not specified in the contract or order (see 6.2.1), then type II
II of MIL-STD-740 shall apply.
34
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