MIL-DTL-16356E
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall consist of the examinations and tests as specified in 4.4
and 4.6.1.
4.2.1 Sample for first article inspection. A sample gauge shall be examined and tested as specified in 4.2
4.2.1.1 Type A gauge. One unit of each class shall be tested at laboratories having a boiler test stand, an
operating boiler, and shock and vibration testing equipment. Laboratory tests shall include tests specified in 4.4.1.1
through 4.4.1.7.
4.2.1.2 Type B gauge. One Type B gauge shall be subjected to first article inspection. First article inspection
4.2.1.3 Type C gauge. One Type C gauge shall be subjected to first article inspection. First article inspection
shall consist of the tests and examinations specified in 4.6.1 and 4.7. Boiler drum diameter shall be suitable to test
requirements of 3.12.2.
4.2.1.4 Gauge testing. In addition to any test stand testing performed by the laboratory, the Type A gauge shall
be tested by installation on a boiler of the applicable pressure rating for the class being tested. Testing shall include
the following:
a.
b.
Ability of ball-check to seat automatically within leakage specified (see 4.4.1.6).
c.
Effectiveness of gauge in indicating boiler-drum water level (see 3.3).
d.
Gauge operation on operating boiler (see 4.4.1.7).
e.
Shock and vibration testing of gauge, valves, illuminators, and hood, if used (see 4.4.1.1 and 4.4.1.2).
4.2.1.5 Type A glass sets. First article inspection of Type A glass sets shall consist of the tests as specified in
4.3 Conformance inspection. Conformance inspection shall include the examination of 4.6 and the tests of 4.7.
4.4 First article tests.
4.4.1 Type A gauge.
4.4.1.1 Shock. Type A gauge, complete with valves, illuminators, and vision hoods, if used, shall be subjected
to Grade A, Type A tests in accordance with MIL-S-901 (see 3.12.12.1). The assembly shall be pressurized and
supported in the same manner as it shall be in the service. Unless otherwise specified (see 6.2), shock test shall not
be required for Type B and C gauges.
4.4.1.2 Vibration. Type A gauges complete with valves, illuminators, and vision hoods, if used, shall be tested
though 33 Hertz (Hz) in accordance with Type I of MIL-STD-167-1 (see 3.12.12.2). The equipment shall be
pressurized and supported in the same manner as it shall be in service. Unless otherwise specified (see 6.2),
vibration test shall not be required for Type B and C gauges.
4.4.1.3 Shut-off and drain valve operation. The valves shall be opened and closed 100 times with saturated
steam at design pressure on the inlet side and with the discharge connection arranged to permit flow under
conditions simulating the maximum flows through the gauge assembly. The opening and closing shall be made with
the valve hot and in cycles; that is, starting with the valve open and thoroughly warmed, it shall be closed with a
recorded torque, observed for tightness, then re-opened with a recorded torque and the procedure repeated. Packing
shall be tight enough to prevent leakage.
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