TM 5-4220-233-14
4-19. DEPRESSURIZING COMPRESSED GAS SYSTEM FOR MAINTENANCE.
This task covers:
a.
Depressurization
INITIAL SETUP :
Tools
Materials/Parts Appendix D
Screwdriver, Flat -Tip
None
Equipment Conditions
None
NOTE
This procedure should be used to depressurize the Compressed Gas System,
excluding storage cylinders for maintenance To depressurize the complete
Compressed Gas System, including storage cylinders, refer to paragraph 4-61.
a.
Depressurization
Figure 4-1. Depressurizing Compressed Gas System for Maintenance.
(1) Open the front doors (1) to gain access to control panel (2).
(2) Verify that all valves (3) on the control panel are closed and pressure regulator (4) is completely
backed off.
(3) Remove side panels (5) from Servicing Unit control compartment.
(4) Verify that valve (6) on each storage cylinder is closed.
(5) Slowly open all eight 1/4-tum ball valves (7).
(6) Slowly open manifold valve (8), servicing valve (9), and bleed off valve (10).
(7) Increase setting on pressure regulator (4) to vent any remaining air through bleed off valve
(8) When air can no longer be heard venting and all pressure gauges read 0 psi, back off on regulator
setting (4) and close all control panel valves. Compressed gas system is now ready for maintenance.
4-18
