SB 740-94-8
M5 Test Set, NSN 1040-00-050-7952, may also be
2. Connect a regulated pressure
used, TM 3-1040-251-5.
source of 180 20 psig to the gun.
(c) Procedure.
NOTE
This test may be conducted in
1. Fill the water jacket with water.
combination with C-4c(4), using the
2. Remove the high pressure tank
disperser as the air pressure source.
from the disperser.
3. Gradually increase the pressure to
WARNING
180 20 psig. Maintain that pressure for a minimum
Bleed any pressure from the
period of 30 seconds and observe for air bubbles with
pressure tank before removing the
the gun nozzle submersed.
coupler assembly.
4. Remove the gun nozzle from the
3. Remove the coupler assembly and,
water and pull the trigger to operate the gun for a five-
using a probe light or flashlight, examine the interior of
second burst. The gun shall function freely and when
the tank for signs of internal corrosion.
the trigger is released the flow of air shall stop. Again
4. Install a high pressure adapter, in
examine the gun nozzle for air bubbles under the water.
place of the valve assembly, in the pressure tank.
5. Disassemble and dry the gun group
5. Subject the pressure tank to the
and return serviceable guns to storage.
pressure for the time specified.
(4) M33A1 disperser assembly, leakage and
6. Release the pressure and, if the
functional check.
pressure tank is serviceable, carefully dry the pressure
(a) Requirements.
tank and reinstall it on the disperser. Unserviceable
tanks will be disposed of in accordance with applicable
1. No leakage in any section during
directives.
regulated pressure test.
(2) M33A1 disperser, agent tank, hydrostatic
2. Functioning will be prompt and
pressure test.
positive.
(a) Requirements. No leakage or permanent
(b) Equipment required.
A regulated air
deformation is allowed when the agent tank is subjected
pressure source (2200 psig) and an Inline Pressure
to an internal hydrostatic pressure of 350 10 psig for a
Check Gage Assembly (identified in Service Kit M254
period of one minute minimum.
as DWG Cl16-3-63).
(b) Equipment required. A regulated pressure
(c) Procedure.
source (400 psig). The pressure gage shall be checked
1. Turn the closure assembly and
for a minimum accuracy of 1 minor scale division.
relieve any pressure in the agent tanks before removing
The M5 Test Set, NSN 1040-00-050-7952, may also
the closure assembly.
be used, TM 3-1040-251-15.
2. Visually check the interior of the
(c) Procedure.
agent tank to ensure that it is clean. Dirt of foreign
1. Connect the tank opening to a
matter can cause gun malfunction.
controlled source of hydrostatic pressure.
3. Replace the closure assembly.
2. Slowly
introduce
hydrostatic
4. Check the disperser gun and hose
pressure to 350 10 psig for a period of not less than 1
to ensure that they are clean. Assemble the hose to the
minute and observe for leakage and any deformity.
gun and connect the hose to the agent tank.
3. Fluid
seepage
shall
indicate
5. Replace the filler cap.
leakage.
6. Install the Inline Pressure Check
4. Any visual permanent physical
Gage Assembly between the low pressure hose and the
change in appearance of the tank assembly shall
quick-disconnect at the regulator outlet.
indicate deformity.
7. Fully close the pressure tank valve.
(3) M33A1 disperser, gun assembly, leakage and
8. Charge the pressure tank with clean
functional check.
compressed air to 2075-2100 psig, and connect it to the
(a) Requirements.
disperser.
1. No valve (gun leakage is allowed.
WARNING
Do not use a pressure source which
2. Smooth trigger movement.
cannot be identified, i.e., markings
(b) Equipment required
A regulated air
missing or marking defaced. Refer
pressure source (180 psig) and a water tank, with a
to
the
Army
Regulation
or
wetting agent in the water.
appropriate technical manual for
(c) Procedure.
information on how to identify the
1. Follow the instructions in TM 3-
contents of pressure tanks. A violent
1040-262-13 to assemble the gun group.
explosion can result if compressed
C-4
