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TM5-42 10-229-14&P
2-25. DRY CHEMICAL VESSEL RECHARGE PROCEDURES (Continued).
If there is any trapped pressure in the vessel its
presence will be apparent from hissing gas es-
caping from the safety hole in the Dry Chemical
Tank fill cap (19, figure 2-1). Do not loosen cap
until there is no further gas escaping.
g. CLOSE the dry chemical emergency shut-off valve (13, figure 2-1).
h. CLOSE the dry chemical handline valve.
i. Add dry chemical as required to fill the vessel.
j. When the vessel is full, replace dry chemical tank fill cap (19, figure 2-1) and tighten firmly.
k. OPEN the dry chemical emergency shut-off valve (13, figure 2-1).
l. CLOSE purge valve (17, figure 2-1) and bleed valve (18).
m. OPEN all nitrogen cylinder valves.
n. Check that all valves and gauges are in the STAND-BY mode of operation (paragraph 2-19).
2-26. NITROGEN CYLINDER REPLACEMENT PROCEDURES.
a. CLOSE all nitrogen cylinder valves.
b. SLOWLY loosen swivel connection at each nitrogen cylinder.
c. Unfasten cylinder clamps.
d. Replace used cylinders with full cylinders.
e. Fasten cylinder clamps.
f. Check that the master control valve (5, figure 2-1) is CLOSED.
g. Connect swivel connections to new cylinders.
h. OPEN all nitrogen cylinder valves.
i. Check that all valves and gauges are in the STAND-BY mode of operation (paragraph 2-19).
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