SB 740-94-8
charged with 2000 100 pounds per square inch gage
NOTE
(psig) of air and tested as specified.
If leakage is observed through the
(b) Equipment required
ball valve, reduce the pressure to 100
1. A regulated pressure source
10 psig and examine the outlet for
(2000 100 psig).
leakage. No leakage is allowed at
2. Leak testing solution.
this pressure.
(c) Procedure.
(4) Container assembly (spare) (E 116-6-
1. Pressurize the high pressure
171).
system with the required pressure, using clean dry air.
(a) Requirement. The spare container
2. Open the high pressure valve.
assembly shall not leak or permanently deform when
The low pressure gage shall indicate 45 to 55 psig.
subjected to a hydrostatic pressure of 125 10 psig for
3. Slowly open the low pressure
a minimum period of 5 minutes when tested a specified.
valve. When the low pressure valve is fully open, the
(b) Equipment required.
low pressure gage shall still indicate 45 to 55 psig.
1. Regulated source of hydrostatic
4. Using a soap solution or
pressure (150 psig).
suitable leak detecting solution, examine all joints and
2. O-Ring (AN 6230-10).
fittings for leakage.
3. Cover plate (Dwg B 116-6-204).
5. Fully open and close the ball
4. Clamp assembly (Dwg B 116-6-
valve three times to allow short bursts (open valve for
177).
approximately 5 seconds) of air to escape. After each
(c) Procedure.
burst of air, leave the valve closed long enough for the
1. Seal the adapter end of the
low pressure to stabilize. The low pressure gage shall
container assembly using "O" ring (AN 6230-10), cover
indicate 45 to 55 psig.
plate (Dwg B 116-6-204), and clamp assembly (Dwg B
6. Open the ball valve to expel all
116-6-177).
the air.
2. Connect a regulated source of
7. When air no longer escapes
hydrostatic pressure and a bleed valve to the plug seat
from the low pressure system, open the charging valve
at the top of the container.
to expel any excess air from the high pressure system.
3. Close
the
bleed
valve,
(2) Permanent volumetric expansion. The
pressurize the container assembly to the specified
compressed gas cylinders shall be tested in accordance
pressure for the required period, and observe for
with AR 700-68. Use any commercial or government
leakage. Fluid seepage indicates leakage.
facility that will test to 3750 psi. Label in accordance
4. Shut off the pressure source
with TM 3-1040-251-15.
and open the bleed valve to remove the pressure from
(3) Container assembly (E 116-16-171), ball
the container.
valve (D 116-6-208), Nozzle (D 116-6-163), and check
5. Clean and dry the container.
valve assembly.
Test these components as an
(5) Relief safety valve.
assembly.
(a) Requirement. The relief valve shall
(a) Requirement.
No leakage or
discharge air between 70 and 90 psig when tested as
permanent deformation is allowed, except as indicated
specified.
in the note below, when tested as specified.
(b) Equipment required.
(b) Equipment required
1. Regulated
source
of
air
1. Regulated
source
of
air
pressure (100 psig).
pressure (150 psig).
2. Pressure gage.
2. Leak testing solution.
(c) Procedure.
(c) Procedure.
1. Connect the valve inlet to a
1. Connect a controlled source of
controlled source of air pressure and a pressure gage.
air pressure to the check valve.
2. Gradually increase the pressure
2. Pressurize
the
assembled
at approximately 1 psig per second until 70 psig is
components to 125 5 psig. Disconnect the source of
applied to the valve.
pressure from the check valve.
3. Activate the manual override
NOTE
feature.
Air should flow through the relief valve.
The M5 Test Set NSN 1040-00-050-
Deactivate the override. Air flow should stop.
7952 may be used, TM 3-1040-251-15.
4. Increase the pressure at the
3. Using a suitable leak detecting
same rate until either the valve relieves or 90 psig is
solution, examine all joints, the ball valve outlet, and the
obtained. If the valve does not relieve prior to 90 psig,
check valve inlet for leakage.
the valve shall be rejected.
(6) Gun Assembly Leakage and Functional
Check.
Change 1 F-4
