Section VIII. USE OF PURGING AND CHARGING EQUIPMENT
This section contains general procedures for the setup of purging and charging equipment necessary to purge and charge
fire control instruments. Refer to TM 750-116 (General Procedures For Purging and Charging Fire Control Instruments)
for procedures on specific fire control instruments.
Set Up of Purging and Charging Equipment (figs. 3-45 and 3-46).
Set Up of Single Stage Pressure Test Fixture (fig. 3-45). Set up the single stage pressure test fixture as
Obtain a tank (7) of dry nitrogen and remove threaded protective cover (6) from the outlet of the tank.
Open tank valve (5) momentarily to rid valve seat of any foreign matter.
Do not drop tank of compressed nitrogen gas. When using in confined areas, use extreme care;
gas could cause asphyxiation.
Securely attach regulator (2) to tank valve (5) using appropriate adapter supplied with purging kit.
Two regulator assemblies are presently in use for purging and charging fire control materiel. The
insert on figure 3-45 shows regulator 5580922 while the tank is shown with regulator 11729749.
Securely attach hose assembly (8) to the adapter (9).
When using regulator 11729749, adapter 10917072-2 is required to connect hose assembly to low
pressure port of regulator.
Rotate pressure regulator valve (4) counterclockwise to the extreme closed position.
Open the nitrogen tank valve (5) slowly until the maximum tank pressure is registered on the high
pressure gage (3).
If pressure indicated is less than 100 psig, obtain and use replacement tank.