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TM 07661B-14/1
APPENDIX A
A 3-15. PRESSURE GAGE REPLACEMENT.
The pressure gage is part of the nitrogen cylinder valve and is under cylinder pressure even when the quick-opening
valve is closed. If gage is broken or inoperative, return entire cylinder assembly to field maintenance personnel.
WARNING
Do not attempt to remove pressure gage unless nitrogen cylinder is under zero pressure.
Nitrogen gas under high pressure can cause serious personal injury.
A 3-16. NITROGEN CYLINDER VALVE.
Replacement of the quick-opening valve on the nitrogen cylinder will normally be accomplished by field maintenance
personnel, because the valve must be removed only with cylinder completely discharged. If valve requires replacement,
return entire cylinder assembly to field maintenance facility, with a tag attached explaining the need for replacement.
WARNING
Nitrogen cylinder valves must be removed only with cylinder under zero pressure. Nitrogen
gas under high pressure can cause serious personal injury.
A 3-17. AFFF SYSTEM PRESSURE REGULATOR.
a.
Removal.
(1)
Completely depressurize AFFF system, paragraph 3-12.
(2)
Remove AFFF nitrogen cylinder. Refer to paragraph 3-10c.
(3)
Disconnect hose (3, figure 3-8), from swivel adapter (9) at outlet of pressure regulator.
(4)
Remove bolt (5) and lockwasher (6) which fastens regulator tee to hose reel mounting bracket on skid
frame. Remove the regulator with the regulator tee.
(5)
Remove hose (1), elbow (2) and short nipple (7) from regulator inlet. Remove tee (4) and short nipple (10)
from regulator outlet.
b.
Installation.
(1)
Before assembling or installing pipe fittings, seal threads using instructions in NOTE, paragraph 3-14c.
Assemble short nipples (7 and 10, figure 3-8) into inlet and outlet ports of pressure regulator. Install elbow (2), with
attached hose (1), on nipple in regulator inlet port. Install tee (4) on nipple in outlet port.
(2)
Fasten regulator assembly to frame as shown, figure 3-8, using 1/2-inch x 3/4-inch stainless steel bolt and
lockwasher installed into threads of merchant plug (8) in regulator tee.
(3)
Connect hose (3) to swivel adapter (9) on outlet.
(4)
Reinstall AFFF nitrogen cylinder. Refer to paragraph 3-1c.
(5)
Pressurize system and check for leaks, paragraph 3-13.
(6)
Return system to standby status, paragraph 2-12a.
A 3-24
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