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Endurance test acceptance criteria |
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|  MIL-P-17639F(SH)
Seal leakage rate and the amount of gland leakage collected
(a)
and drained by the collection area.
The conditions of the bearings (by audible noise; by feel;
(b)
and by bearing temperature via probe if the design includes
provisions for a probe, otherwise via a surface pryometer
on a normally exposed surface; no disassembly required).
The airborne noise level (normalabnormal).
(c)
The vibration level (normal-abnormal).
(d)
The smoothness of operation (normal-abnormal).
(e)
(f)
All other abnormal findings.
All adjustments made.
(g)
(h)
Changes made in the conditions or method of operation.
4.6.7.1.5 Endurance test acceptance criteria.
Endurance test acceptance
criteria shall be as follows:
(a)
Head-capacity curve at maximum rated speed after 500 hours
of pump operation shall conform to the specification
requirements and shall show no abnormal deviations from
the curve before the 500-hour test.
Unit performance and operation after 500 hours of operation
(b)
shall be unchanged and normal and meet all specification
requirements .
(c)
Unit operation at the end of the endurance test shall be
smooth and shall exhibit noise and vibration levels that
are normal and in conformance with the specification.
(d)
Lubrication shall have remained satisfactory throughout the
test period. Bearing temperatures shall have remained
normal and shall be consistent with their respective
bearing clearances and oil and grease limitations.
Leakage rate from a mechanical shaft seal shall not exceed
(e)
five drops per minute.
Running clearances shall be normal.
(f)
Components subject to attack from corrosion, erosion,
(g)
cavitation, etc. shall be in a condition commensurate with
500 hours of service.
Wear rates for wearing parts, critical for proper operation,
(h)
shall show 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.
(i)
4.6.7.1.6 Post endurance test procedures. The unit subjected to the
500-hour endurance test shall be restored to the as-new condition by replace-
ment of all parts worn beyond the as-new design tolerances. The restored unit
shall successfully pass the tests specified in 4.6.1, 4.6.3(a), and 4.6.4, if
applicable. The quality conformance 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.
4.6.7.2 Shock test. The pump shall undergo a shock test to ascertain
that the pump has the necessary shock resistance. The shock test shall be
performed in accordance with MIL-S-901, grade A, and the specific shock test
requirements (see 6.2.1).
48
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