|
| |
TM 07661B-14/1
APPENDIX A
covering. Secure with white plastic tape.
(5)
Pressurize system and check for leaks, paragraph 3-13.
(6)
Return system to standby status, paragraph 2-12a.
A 3-20. DRY CHEMICAL SHUTOFF VALVE.
a.
Removal.
(1)
Depressurize dry chemical system completely, paragraph 3-12.
(2)
Disconnect valve rod (1, figure 3-11) from dry chemical valve by removing nut (2).
(3)
Uncouple discharge hose (4) at nipple (5). Disconnect hose (6) from swivel adapter (7).
(4)
Remove shutoff valve (3) along with short pipe (8) and side outlet elbow (9) from tank discharge port. A
small amount of chemical will drain from pickup tube inside tank when valve is removed. If chemical continues to flow,
release any residual pressure in tank by loosening fill cap.
(5)
Remove swivel adapter (7), nipple (8) and elbow (9) as an assembly from shutoff valve.
b.
Installation.
(1)
Before assembling or installing pipe fittings, seal threads using instructions in NOTE, paragraph 3-14c.
Assemble valve assembly (3) on pipe (10), as shown in figure 3-11. Install nipple (8) and elbow (9) and swivel adapter
(7) into valve (3).
(2)
Connect hose (6) to swivel adapter (7) in side outlet elbow. Recouple discharge hose (4) to nipple (5).
(3)
Connect valve rod (1) to shutoff valve by installing nut (2) to shut-off valve (3).
(4)
Tighten fill cap, pressurize system and check for leaks, paragraph 3-14.
(5)
Return dry chemical system to standby status, paragraph 2-12a.
A 3-21. PRESSURE RELIEF VALVES.
a.
Removal.
(1)
Depressurize system completely, paragraph 3-12.
(2)
Using a wrench on the hex of the relief valve, unscrew valve from piping.
b.
Installation.
(1)
Before assembling or installing pipe fittings, seal threads using instructions in NOTE, paragraph 3-14c.
Assemble relief valve on piping. Tighten securely.
(2)
Pressurize system and check for leaks, paragraph 3-13.
A 3-22. FUSIBLE PLUG.
a.
Removal.
(1)
Access to plug is through bottom of skid frame. (Figure 1-8).
(2)
Depressurize AFFF tank completely. Plug removal will result in tank draining. Be prepared to collect any
AFFF solution remaining in tank.
(3)
Using a wrench on hex of plug, turn plug counterclockwise to remove.
A 3-28
|
