Engineering Company. This cart has been selected for
(LLCL) system was designed to alleviate these
problems. The TMU-70/M significantly reduces liquid
coverage in this training manual because it is the most
oxygen transfer losses and virtually eliminates the
common and it is also the only one with the low-loss,
safety hazards associated with venting oxygen in
closed-loop system.
critical areas. In the brief discussion that follows, refer
During servicing of aircraft LOX converters with
to figure 10-6, which is a functional schematic of the
standard LOX trailers, considerable loss of oxygen
LOX servicing trailer.
occurs as a direct result of venting overflow into the
environment. This also creates a considerable safety
The TMU-70/M is a completely self-contained
hazard due to releasing liquid oxygen and oxygen
unit. It has three major components: a 50-gallon dewar
vapors into the atmosphere near operating equipment
tank, a 15-liter dewar transfer tank, and a low-loss,
closed-loop (LLCL) system of transfer lines. (A dewar
and personnel. The TMU-70/M low-loss, closed-loop
P-2
SD-3
RV-2
RV-1
SD-2
LG-1
P-1
GV-3
SD-1
VACUUM PUMPOUT
GV-6
VENT LINE
DISCHARGE
STORAGE
RV-3
TANK
C-1
LV-1
GV-4
LF-1
LV-2
C-3
CV-2
CV-1
F-1
C-2
LG-2
TRANSFER
TANK
GV-5
PRESSURE
ASf10006
BUILDUP COIL
C-1
Fill-drain line coupling
LG-2
Transfer tank liquid level gauge
LF-1
Fill-drain line filter
RV-2
Transfer tank inner shell relief valve
LV-1
Fill-drain line shutoff valve
SD-3
Transfer tank nner shell rupture disc
RV-3
Fill-drain line relief valve
C-3
Converter vent line connecter
GV-6
Storage tank vent line shutoff valve
C-2
Filler valve
LG-1
Storage tank liquid level gauge
CV-1
Converter vent line check valve
P-1
Storage tank pressure gauge
F-1
Converter full indicator gauge
RV-1
Storage tank inner shell relief valve
GV-4
Converter vent line shutoff valve
SD-1
Storage tank nner shell rupture disc
GV-5
Transfer tank pressure buildup valve
LV-2
Transfer tank fill line shutoff valve
SD-2
Outer shell relief device
GV-3
Transfer tank vent line shutoff valve
CV-2
Converter vapor return check valve
P-2
Transfer tank pressure gauge
Figure 10-6.--LOX servicing trailer schematic diagram.
10-5
