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TM 9-254
3-19.
Short Term Shutdown of Purging and Charging Equipment.
a.
Short Term Shutdown for Single Stage Fixture (fig. 3-45).
(1) With hose still connected to the purged unit, close tank valve (5) hand tight by turning clockwise.
(2)
Turn pressure regulator valve (4) counterclockwise until it moves easily in either direction. Pressure
regulator valve is closed.
(3)
Loosen hose (8) connected at the purged unit. Let pressure on the low pressure gage (1) go to 0.
Remove hose from purged unit.
(4)
Open pressure regulator valve (4) by turning clockwise. Gas will flow through the low pressure gage (1)
and out the open end of hose (8).
(5)
When gas has been completely exhausted from the hose (8), both the low pressure gage (1) and the
high pressure gage (3) will indicate 0. Close pressure regulator valve (4) by turning it counterclockwise
until it moves easily in either direction.
b.
Short Term Shutdown for a Two Station Pressure Test Fixture (fig. 3-46).
(1)
With the hose still connected to the purged unit, close tank valve (3) hand tight by turning clockwise.
(2)
Turn regulator valve (13) counterclockwise until it moves easily in either direction. Pressure regulator
valve is closed.
(3)
Loosen feeder tube connected to the purged unit. Let pressure on the test fixture gage (11) go to 0.
Remove feeder tube from purged unit.
(4)
Open regulator valve (13) by turning it clockwise. Gas will flow out the open end of the feeder tube.
(5)
When gas has been completely exhausted from the feeder tube, the test fixture gage (11), high pressure
gage (2), and low pressure gage (1) will indicate 0. Close regulator valve (13) by turning it
counterclockwise until it moves easily in either direction.
(6)
Close manifold valve (10) and disconnect feeder tube from outlet pipe (6) and block off outlet pipe with
the stopper (7).
3-20.
Time Cycles.
a.
Maintenance personnel will purge and charge fire control materiel every 90 days or when condensation is
evident in the instrument.
NOTE
The 90 day cycle does not apply to rangefinder end housings which are purged and charged once
a year. However, a visual inspection is required every 90 days for evidence of moisture.
3-47
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