TM 5-4220-233-14
a.
Preparing Compressed Gas System for Leak Test.
(1) Verify that Servicing Unit is properly set for operation per paragraph 2-7.
(2) Verify that all valves on the control panel (1) and at each storage cylinder (2) are closed and pressure
regulator (3) is completely backed off.
(3)Verify that all dust caps (4) on control panel (1) are Installed and tightened.
b.
Perform Leak Test.
(1) Open cylinder valve (5) for cylinder with highest charge.
(2) Slowly open MANIFOLD valve (6), RECHARGE valve (7), and HIGH PRESSURE valve (8).
(3) Using leak detector (Item 6, Appendix D), perform leak test on high pressure portion of Compressed
Gas System starting at eight cylinder valves and ending at manifold pressure gauge (Figure 1-4 sheet
1). If a leak is detected proceed to paragraph c.
NOTE
Determine if fill hose(s) were repaired. If hoses were not repaired proceed to step
6. Otherwise proceed to next step.
(4) Remove dust cap(s) from fill stations #1 through #4 as needed and connect fill hose(s) and strain reliefs
to be tested.
(5) Connect yoke adaptor(s) (9) on fill hose(s) to scuba cylinder to prevent air leakage out of yoke
adaptor(s).
(6) Ensure bleed screw (10) on each yoke adaptor (9) is closed.
(7) Open servicing valve (11) and all four fill station valves (12).
(8) While monitoring servicing pressure gauge (13), slowly adjust pressure regulator (3) until a pressure of
3,000 psi is obtained.
(9) Using leak detector (Item 6, Appendix D), perform leak test on low pressure portion of Compressed
Gas System starting at servicing pressure gauge and ending at four fill station ports or fill hose yoke
adaptors if connected (Figure 1-4 sheet 2). If a leak is detected proceed to paragraph c.
(10) Close cylinder valve opened to provide test pressure.
(11) Slowly open bleed off valve (14) and allow Compressed Gas System to be vented.
(12) When air can no longer be heard venting completely open bleed off valve (14) to ensure all air has
been vented, then close valve.
(13) Close all valves on the control panel and back off on pressure regulator (3).
(14) If fill hose(s) were leak tested proceed to step 15. If hose(s) were not leak tested Install the control
compartment side access panels (15) and secure the front doors (16).
(15) Disconnect yoke adaptor(s) (9) from plug(s).
(16) Disconnect fill hose (s) from fill station (s) , install dust cap(s) on fill station(s).
(17) Cover and stow fill hose(s) in Compressed Gas System tool box (17).
(18) Install the control compartment side access panels (15) and secure the front doors (16).
c.
Leak Repair.
(1) Depressurize Compressed Gas System in accordance with paragraph 4-19.
(2) Repair leak as required.
(3) Test Compressed Gas System in accordance with paragraphs a and b.
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