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|  MIL-V-18318B
Preparation for delivery - An inspection lot size shall be expressed
4.5.1.1.2
in units of one fully prepared shipping container, containing valves fully prepared for
delivery, made from essentially the same materials and components. The sample
unit shall be one shipping container, containing valves fully prepared for delivery with
the exception that it need not be sealed.
Sampling for tests and examinations of valves - The sample
4.5.1.2
size, acceptance criteria, tests, and examinations required for the valves shall be
as specified in Table II.
4.6
Test conditions -
4.6.1
Temperature and pressure - Unless otherwise specified, tests
shall be conducted at local ambient temperature and barometric pressure. The
temperature and barometric pressure shall be recorded at the time of inspection. This
information shall be available for computation of test date, where required, to normal
temperature and pressure (NTP) conditions. NTP conditions are 29.92 inches of mercury
and 70F. Test instruments shall be calibrated or adjusted according to their required
usage in conducting individual tests.
Gas - Unless otherwise specified, the gas used in testing the
4.6.2
valve shall be oxygen conforming to MIL-O-27210, type I. When specified, nitrogen,
conforming to BB-N-411, type I, class I, grade B, or water-pumped air, equivalent
in dryness to BB-N-411, type I, class I, grade B nitrogen, may be used provided
appropriate density correction factors are applied.
4.6.3
Orientation - When subjected to the tests specified in 4.7.3
and 4.7.4, the valves shall be positioned with the centerline of the passage parallel
to a vertical plane. Each consecutive valve tested shall be rotated 90 degrees and 180 degrees
about an axis perpendicular to the vertical plane. The rotation shall always be in the same
direction.
4.7
Inspection methods -
4.7.1
Visual examination -
4.7.1.1
Valve - Every valve shall be examined visually (for critical
defects) to determine conformance to this specification. The classification of defects,
Table III, shall be used to classify the defects found.
4.7.1.1.1
Dimensions - The valve shall be checked dimensionally
to determine conformance to the dimensions specified herein.
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