MIL-P-17574D(YD)
4 2 Classification of inspection.
The inspection requirements specified
herein are classified as follows:
First article inspection (see 4.2.1).
a.
b.
Quality conformance inspection (see 4.2.2).
c.
Packaging inspection (see 4.5).
4.2.1 First article inspection. First article inspection shall be performed
on one pump system when a first article is required (see 3.2 and 6.6) . This
inspection shall include the examination of 4.3 and the tests of 4.4. Failure
of the first article to pass the examination or any of the tests shall be cause
for rejection. The first article may be either a first production item or a
standard production item from the supplier's current inventory provided the item
meets the requirements of the specification and is representative of the design,
construction, and manufacturing technique applicable to the remaining items to
be furnished under the contract.
4.2.2 Quality conformance inspection. The quality conformance inspection
shall consist of the examination of 4.3, the tests of 4.4, and the packaging
inspection of 4.5. When a first article is tested in accordance with the
requirements of 4.4, and has passed, the tests of 4.4 need not be performed for
the quality conformance inspection. When the tests of 4.4 are to be performed
for the quality conformance inspection, they shall be performed on one
production unit.
4.3 Examination.
Each engine-pump system hall be examined for compliance
with the requirements specified in section 3 of this specification. Any
redesign or modification of the contractor's standard product to comply with
specified requirements, or any necessary redesign or modification following
failure to meet specified requirements shall receive particular attention for
adequacy and suitability. This element of inspection shall encompass all visual
examinations and dimensional measurements. Noncompliance with any specified
requirements or presence of one or more defects preventing or lessening maximum
efficiency shall constitute cause for rejection.
4.4 Tests. The first article, when furnished, shall be tested, and any
system failing to pass the following tests, as applicable, shall be rejected.
Tests shall be conducted as outlined in the referenced documents and as herein
specified.
4.4.1 Performance test. The pump-engine system shall be operated
continuously using water for period of not less than four hours. After the
four-hour test, the pump-engine system shall be run continuously for 30 minutes
through a range of speeds obtained with maximum-to-minimum engine speed control
settings. No critical speeds shall be permitted at any point of the range. No
leakage shall be evident in the casing or through the casing gasket. Minor
leakage through the stuffing boxes or mechanical seals shall not be cause for
rejection.
4.4.2 Hydrostatic test. The pump casing shall be subjected to a hydrostatic
test, with the pressure equal to 1.5 times the maximum design pressure developed
at full throttle operation, in accordance with the Standards of Hydraulic
Institute and ASME B 73.1M or API STD 610, as applicable.
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