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 TM 55-1730-226-13
LEAK CHECK.
4.11.1
To perform a leak check proceed as follows:
If a pressure source is not already connected
1.
to the Oxygen Servicing Unit, connect a bottle
of clean, dry, oil-free filtered nitrogen gas
(Federal Specification BB-N-411), item 3, App C,
pressurized to approximately 3000 psig, to the
appropriate oxygen pigtail(s).
Verify that the regulator pressure outlet
2.
valve is closed by turning the T-handle in
a counterclockwise direction until firmly
seated. Verify that the bottle pressure
outlet valve is closed by turning the control
knob in a clockwise direction until firmly
seated.
Open all pigtail valves to the oxygen bottles.
3.
4.
While observing the input indicator on the
REGULATOR PRESSURE OUTLET VALVE,
slowly open the control valve of the pressure
source by turning the valve control in a
counterclockwise direction until the regulator
dial indicates 2500 100 psig. Observe and
record the pressure reading and the temperature
reading.
5.
Close control valve of the pressure source
and allow the Oxygen Servicing Unit to remain
under pressure for at least 24 hours at con-
stant temperature.
Again observe and record the pressure and
6.
temperature readings. Any reduction in
pressure from the initial to the final pressure
reading shall constitute failure.
NOTE
Should there be a change in tem-
perature over the 24-hour hold
period, the pressure. readings must
be corrected to compensate for the
change. The pressure will be di-
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