a central supply tank. The shutoff valve is opened
completely during the filling function and then closed
CAUTION
after the transfer has been completed.
The fill-drain line shutoff valve is not used
STORAGE TANK VENT LINE SHUTOFF
to control flow. Restricting transfer flow may create
VALVE.--(Fig. 8-2, item 11). The vent valve is used to
a dangerous back-pressure on the supply line used
control the release of gaseous vapors from the storage
for filling. Control of transfer flow should be
tank to the vent-piping manifold. The valve is open
maintained with the service valve of the central
during filling to vent all pressure from the storage tank.
supply tank.
During normal idle storage, the valve is left in the open
position to vent all vapors generated by normal liquid
oxygen boil-off. When the cart is not in use, the valve is
FILL-DRAIN LINE SHUTOFF VALVE.--(Fig.
left closed to prevent oxygen contact with flammable
8-2, item 10). The fill valve is used during the storage
liquids or vapors.
tank filling operation to permit the flow of oxygen from
13. TRANSFER TANK LIQUID LEVEL GAUGE (LG-2)
1. FILL-DRAIN LINE COUPLING (C-1)
14. TRANSFER TANK INNER SHELL RELIEF VALVE (RV-2)
2. FILL-DRAIN LINE FILTER (LF-1)
15. TRANSFER TANK INNER SHELL RUPTURE DISC (SD-3)
3. FILL-DRAIN LINE SHUTOFF VALVE (LV-1)
16. CONVERTER VENT LINE CONNECTOR (C-3)
4. FILL-DRAIN LINE RELIEF VALVE (RV-3)
17. FILLER VALVE (C-2)
5. STORAGE TANK VENT LINE SHUTOFF VALVE (GV-6)
18. CONVERTER VENT LINE CHECK VALVE (CV-1)
6. STORAGE TANK LIQUID LEVEL GAUGE (LG-1)
19. CONVERTER FULL INDICATOR GAUGE (F1)
7. STORAGE TANK PRESSURE GAUGE (P-1)
20. CONVERTER VENT LINE SHUTOFF VALVE (GV-4)
8. STORAGE TANK INNER SHELL RELIEF VALVE (RV-1)
21. TRANSFER TANK PRESSURE BUILDUP VALVE (GV-5)
9. STORAGE TANK INNER SHELL RUPTURE DISC (SD-1)
22. OUTER SHELL RELIEF DEVICE (SD-2)
10. TRANSFER TANK FILL LINE SHUTOFF VALVE (LV-2)
23. CONVERTER VAPOR RETURN CHECK VALVE (CODE
11. TRANSFER TANK VENT LINE SHUTOFF VALVE (GV-3)
C AND D)
12. TRANSFER TANK PRESSURE GAUGE (P-2)
Figure 8-3.--TMU-70/M liquid oxygen servicing trailer schematic diagram.
8-4
