ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0055 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
AIR SYSTEM, REDUCED PRESSURE
WARNING
The TWPS must be in Shutdown and the TQG and TWPS main breaker must be off
(Army) or the TWPS disconnected from its power source (Marine Corps) prior to
performing maintenance on the TWPS Air System. Failure to observe this warning
can result in injury to personnel and damage to equipment.
High pressure. The air system contains air pressure up to 1800 psig. The air
system must be bled prior to performing maintenance on components of the air
system. Failure to observe this warning can result in injury to personnel and
damage to equipment.
Replace Shutoff Valve V-909 as follows:
1. Make sure the air system has been bled down. Refer to ENTIRE AIR SYSTEM BLEED DOWN.
2. Remove the Air System Section 6 assembly from the TWPS. Refer to REPLACE and Air
System Section 6 Assembly.
3. Disconnect Shutoff Valve V-909 from the 1/2" pipe nipple that connects the shutoff valve to the
coalescer (see Figure 12).
SHUTOFF VALVE V-909
1/2" TEE CONNECTION
VENT VALVE V-910
1/2" PIPE NIPPLES
COALSCER CO2
Figure 12. Shutoff Valve V-909.
4. Place old Shutoff Valve V-909 on a clean workbench and perform the following:
a. Remove the two 1/2-in. pipe nipples. Clean all disassembled parts.
b. Apply antiseizing tape to both ends of the two pipe nipples.
5. Install new Shutoff Valve V-909 as follows:
a. Thread the two 1/2-in. nipples into both sides of Shutoff Valve V-909 and tighten hand
tight.
b. Thread Shutoff Valve V-909 onto the oil/water coalescer and tighten.
c. Refer to Figure 12 for the correct positioning of Shutoff Valve V-909.
6. Install the Air System Section 6 assembly onto the TWPS. Refer to REPLACE and Air System
Section 6 Assembly.
7. Check new Shutoff Valve V-909 and attached piping for leaks.
055 00-19
