MIL-PRF-2940D
thread to mate with the MS16142 female connection port of the pressure
transducer. An O-ring shall be supplied on the outlet connection.
3.3.3 Cleaning. The snubber body and all parts that come into contact
with the service fluid shall be free of all loose scale, rust, grit, fillings,
and free of mercury, calibration liquids, oil, grease, solvents, and other
organic materials. Type 3 snubbers for oxygen or nitrogen service shall be
cleaned in accordance with MIL-STD-1330.
3.3.4 Marking. Each snubber shall be metal stamped or otherwise
permanently marked with the maximum working pressure, classification (see 1.2)
and manufacturer's stamp or trademark. The material composition shall be
included in the marking identified by the UNS (see 3.2). The maximum working
pressure shall be followed by the abbreviation "psi." (For example: 6000 psi
M2940-1HBPG *. *manufacturer's stamp or trademark and UNS, as applicable.)
3.3.4.1 Flow direction. The direction of flow through the snubber
shall be indicated by an arrow with the word "gauge" at the point of the
arrow. The arrow shall be raised from the surface or etched into the surface
in a permanent manner and to the extent that it can be easily identified by
human touch. The word "gauge" shall be metal stamped or otherwise permanently
marked.
3.3.4.2 Type 3 snubbers shall have a warning label included on its
primary pack marked "oxygen" or "nitrogen" service, as applicable for the
system use when cleaned for these services.
3.4
Performance.
3.4.1 Steady state transmission. The difference in indicated output
with and without the snubber under test shall be within the accuracy limits of
the pressure transducer or pressure gauge employed when tested as specified in
4.6.1.
3.4.2 Dampening. The pressure as indicated by the test pressure
transducer shall satisfy both the following criteria when tested as specified
in 4.6.2:
(a)
Indicate a pressure of 25 percent or less of the final
steady state pressure at a time equal to that at which
the monitoring pressure transducer initially reaches its
step pressure level.
(b)
Reach at least 90 percent of its final steady state pressure
in not more than 2.5 seconds after initiation of the
pressure step as indicated by the monitoring transducer.
3.4.3 Temperature. The snubber under test shall show no evidence of
leakage or damage as a result of the temperature test specified in 4.6.3. The
snubber under test shall meet the dampening requirement of 3.4.2 after the
high temperature, low temperature, and temperature cycling portions of 4.6.3.
3.4.4 Vibration. The snubber under test shall show no indication of
leakage or damage as a result of the vibration testing specified in 4.6.4.
Upon completion of the vibration test, the snubber shall meet the dampening
requirement of 3.4.2.
3.4.5 Shock. The snubber under test shall show no indication of
leakage or damage as a result of the shock testing specified in 4.6.5. Upon
completion of the shock test, the snubber under test shall meet the dampening
requirement as specified in 3.4.2.
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