Chapter 6 - Turret Purging
TM00358 Rev. A
October 2007
L-3 WESCAM
104
All Rights Reserved
Figure 6-2 Purge Kit Regulator Assembly
WARNING: ALTHOUGH INERT, THE NITROGEN GAS YOU WILL BE HANDLING IS COMPRESSED AND
THEREFORE SHOULD BE TREATED WITH THE CARE ANY COMPRESSED GAS REQUIRES.
REVIEW ALL MATERIAL SAFETY DATA SHEETS (MSDS) TO ENSURE SAFE HANDLING.
Caution:
Turret’s purge valve damages easily. Hang and isolate the supply hose to make sure the purge
valve does not bear the weight of the air hose and chuck. The purge valve could break off if the
hose is moved or kicked accidentally.
Caution:
When purging, the nitrogen feed pressure should never exceed 0.35 kg/cm
²
(5 psi). Otherwise,
you risk damaging internal valves and other sensitive parts.
Note: During this procedure, you should place a tag on the operator interface warning that operators should not
power up the system until purging is complete.
Purging the Turret
This purge procedure has been written for use with an L-3 Wescam purge kit (P/N 42424). While intended to be
generic, you might experience minor differences using other purge equipment.
1. Steer the turret to a Forward position.
2. Pull and tag the main breaker to disable power and steering control to the turret.
3. By hand, orient the turret to a position where you will have easy access to the purge valve, and you can see
the turret’s humidity indicator easily.
4. If stored in a carrying case, remove the regulator assembly from the case.
5. Turn the purge kit's regulator counter-clockwise to confirm that hose supply is closed.
6. Connect the regulator assembly to the nitrogen supply tank.
7. Tighten the regulator assembly with a wrench to prevent this connection from leaking.
8. Apply leak check to ensure the regulator assembly does not leak nitrogen.
9. Open the nitrogen supply tank valve fully.
10. Confirm the hose pressure gauge is reading 0 kg/cm
²
(psi).
11. Remove the valve extension from the air hose chuck.
12. Turn the regulator clockwise and adjust hose pressure to 0.35 kg/cm
²
(5 psi) (correct purge pressure).
13. From the back door of the turret, locate the purge valve, remove the cover cap, and store in a safe place for
replacement.
14. Ensure there is no debris inside the purge valve.
15. Ensure there is no debris inside the valve extension.
Supply Hose
Valve Extension
Hose Pressure
Tank Pressure
Regulator
Air Hose Chuck