MIL-DTL-16356 Gauges, Direct Reading, Oblong GlassThis specification covers direct reading sight indicators and gauges that use oblong glass panes of the reflex or plain transparent type, including replacement glass and gasket sets.

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MIL-DTL-16356E

4.6 Conformance inspection.

4.6.1 Visual and dimension examination. Each of the sample items selected as specified in 4.5.2 shall be

visually and dimensionally examined to verify compliance with all requirements of this specification not involving

tests, and for conformance to 5000-S5100-841604.

4.6.2 Magnetic particle inspection (type A gauges only). Pressure containing alloy forgings shall be

100 percent magnetic particle inspected in accordance with T9074-AS-GIB-010/271. Carbon steel forging are not

to be magnetic particle inspected.

4.7 Tests. Each of the samples selected as specified in 4.5.3 shall be subjected to the applicable tests listed in

table VII. When specified (see 6.2), tests specified in table VII may use an AQL of 1.0.

TABLE VII. Tests.

Test

Reference Paragraph

Hydrostatic pressure, valve shell

4.7.1.2

Hydrostatic pressure, assembled valve (for seat tightness)

4.7.1.3

Hydrostatic pressure, ball-check

4.7.2

Spring cone hardness

4.7.6.2

Type A glass sets, first article and conformance

4.7.7

Bend test (glass)

4.7.7.7

Polarization test (glass)

4.7.7.8

Mica visual quality (Type A only)

4.7.7.10

Type B and C glass sets, conformance

4.7.8

Gauge Assembly Pressure Tests:

Hydrostatic pressure, or

4.7.3

Steam pressure

4.7.4

4.7.1 Shut-off and drain valve hydrostatic pressure tests.

4.7.1.1 Hydrostatic tests. Each of the sample valves selected as specified in 4.5.2 shall be subjected to the tests

specified in 4.7.1.2 for strength and porosity and the tests specified in 4.7.1.3 for tightness. The water temperature

shall be 70 to 120 �F. The test pressure tolerance shall be +2 percent to -0 percent of nominal and rounded off to the

nearest multiple of the smallest graduation of the test pressure gauge, not to exceed 50 psig.

4.7.1.2 Shell test. Valve bodies shall be subjected to the applicable pressures specified in table VIII for a

duration of 3 minutes. Any weeping, leakage, or permanent deformation shall be cause for rejection.

TABLE VIII. Test pressure for strength and porosity.

ANSI Valve Ratings (psi)

Pressures (psig)

150 (Type C)

450

300 (Type B)

1125

600 (Type A, Class I and II)

2250

1500 (Type A, Class IV)

5575