ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
AIR SYSTEM, HIGH 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 Relief Valve RV-902 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 1 assembly. Refer to REPLACE and Air System Section 1
Assembly.
3. Replace Relief Valve RV-902 as follows (see Figure 19):
a. Remove Relief Valve RV-902 from the bell reducer.
b. Remove the bell reducer from the close nipple and then remove the close nipple.
RELIEF VALVE RV-902
CLOSE NIPPLE
BELL REDUCER
Figure 19. Relief Valve RV-902.
2.
Clean the bell reducer and close nipple.
3.
Install antiseizing tape to the threads of the new Relief Valve RV-902.
4.
Install antiseizing tape onto both ends of the reducer bushing
5.
Install the new Relief Valve RV-902 onto the bell reducer and the close nipple into the other end.
6.
Tighten the relief valve in the position shown in Figure 19.
7.
Install the Air System Section 1 assembly onto the TWPS. Refer to REPLACE and Air System
Section 1 Assembly.
8. Check the new Relief Valve RV-902 and associated piping for leaks.
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