Pressure Testing and Charging the Pressure Tank

TM 3-1040-214-12

(6) Remove the coupling cap (Fig. 2-2) from

(c) Place the rag or sponge in the

the agent delivery pipe (step A). Install coupling cap on

decontaminating solution for 30 minutes.

the coupling cap holder (step B).

(d) Rinse sponge and rag in clean

water and air-dry.

(7) Check to see that the rubber gasket in the

(e) Dispose

the

used

solution

ball depressing ring is not missing and is in place (step C).

(para 413b).

(f) Flush the exterior of the equipment

(8) Rotate the ball depressing ring (step C) on

with water. Wipe the equipment with a clean cloth.

the hose coupling until the slot, in the ring is in line with

(g) Use pressurized air (5 to 10 psi), if

the lock pin. Pull back the ball depressing ring on the

available to thoroughly dry the equipment.

hose coupling. Connect hose coupling to the agent

(21) Agent tanks filled with agent must be kept

delivery pipe tank coupling (step D).

in an upright position (Fig. 1-1) to prevent clogging and

malfunction of equipment.

(9) Allow the ball depressing ring to engag e

the balls. Make certain that the coupling is secured.

4-9. Pressure Testing and Charging the Pressure

Rotate the ball depressing ring so that the slot is not in

Tank

line with the lock pin.

a. Pressure Testing. Air pressure in the pressure

(10) Disconnect the hose assemblies from the

tank must be checked as follows: (1) prior to use with the

pipe and cap assemblies. Remove the pipe and cap

disperser, and (2) prior to recharging pressure tank. Air

assemblies.

pressure must be between 1,700 psi and 2,100 psi for

maximum efficiency. Perform pressure test as specified

(11) Don protective mask, protective mask

in TM 3-1040-221-12 by using the M27 service kit.

hood, and rubber gloves.

b. Charging Pressure Tanks. Air pressure must be

(12) Insert the filling hopper nozzle or funnel

checked (a above) prior to charging pressure tanks.

into the open end of the agent tank.

TM 3-1040-221-12 contains charging operations by

using the M27 service kit. Air may be provided by either

(13) Open the top of the bag and dump

commercial cylinders (TM 3-1040-221-12) or suitable air

approximately half of the agent into one agent tank.

compressors (para 4-11).

(14) Insert the hopper nozzle or funnel into the

4-10. Purging and Replacing Pressure Tank

open end of the second agent tank.

WARNING

(15) Dump the remaining agent into the second

Purge the air in the air pressure

agent tank.

system

before

attempting

any

maintenance or modification to the

(16) Remove agent that may h.

e been

pressure system.

lodged into the tank threads.

a. Purging Operation.

(17) Reinstall the pipe and cap assemblies

(1) Close (clockwise) pressure tank valve with

removed in step (10) above. Handtighten pipe and cap

handle (Fig. 2-1).

assemblies.

(2) Open (counterclockwise) shutoff valve to

(18) Cross both hoses as shown in figure 1-6

vent air pressure in agent tanks (Fig. 2-1).

and connect them to the pipe and cap assemblies.

b. Removal.

(1) Place the tank group in a horizontal

(19) Close shutoff valve opened in (5) above.

position with pressure tank on top side.

(2) Remove and retain wingnut (step B, Fig. 2-2)

(20) Perform the following operations if agent

and clamp.

has been spilled on the exterior of the equipment.

(a) Dampen a rag or sponge with

(3) Open (counterclockwise) pressure tank

decontaminating solution (para 4-13a).

valve with handle. After venting pressurized air, close

pressure tank valve.

(b) Wipe the agent off the exterior

surface.

(4) Disconnect hinged tank clamp by

completely loosening wingnut (Fig. 1-4).

4-7