NOTE: Observe the time required to fill the
TMU-70/M. Filling will vary with each supply
CAUTION
tank and supply system. Under normal
Pressure should not be allowed to rise above 55
conditions and 30 psi transfer pressure, the
pounds per square inch (psi) in the storage tank.
storage tank should fill within a period of 5 to
Monitor the storage tank pressure gauge (7) closely
10 minutes. Deviation from the average filling
during cooldown.
time should be cause for investigation.
TRANSFER.--The transfer of LOX from the
Open the service valve on the supply tank slowly,
storage tank of the trailer to an aircraft converter can be
and allow only a partial flow of LOX through the
done in the following manner. Ensure that all safety
transfer hose and into the trailer. Considerable
equipment is in use. Close all control valves (3, 5, 10,
vaporization will take place until the transfer hose,
11, 20, and 21, as show in figure 8-3). Observe storage
fill-drain line, and storage tank on the trailer have
tank liquid level gauge (6) and pressure gauge (7) to
cooled down. When these have sufficiently cooled and
ensure sufficient LOX supply and safe operating
are able to handle a full flow of LOX, open the service
pressure. Open the transfer tank fill valve (10) and vent
valve on the supply tank completely.
valve (11) to allow the transfer tank to fill.
During filling, LOX flow is through the fill-drain
When the transfer tank is full, as indicated by the
line filter (2) and shutoff valves (3) to the storage tank.
liquid level gauge (13), close the shutoff valves (10) and
The relief valve (4) is provided to prevent excessive
(11). Connect the converter vent line connector (16) to
pressure if the fill-drain line shutoff valve and the
the converter vent fitting. Connect the air force (AF)
service valve on the supply tank are closed with cold
filler valve (17) to the converter fill fitting, using a
gas or liquid trapped within the supply line.
two-step procedure. First, position the valve against the
purge fitting and turn the housing clockwise, locking
The relief valve (4) is connected to the vent line for
the valve in place. Second, push the knurled knob
safe discharge overboard. The vent line shutoff valve
forward and rotate clockwise, locking the valve in the
(5) is opened during filling and normal storage where
open position. Open the transfer tank pressure buildup
safe overboard discharge is provided. Storage tank
valve (21) momentarily and observe the tank pressure
conditions are monitored and indicated by the liquid
gauge (12).
level gauge (6) and pressure gauge (7).
When pressure rises to approximately 90 psig,
The inner shell relief valve (8) and rupture disc (9)
close valve (21). If necessary, maintain desired pressure
are provided in case of excessive pressure in the storage
by regulating pressure buildup valve (21) during
tank. Monitor the storage tank liquid level gauge (6)
converter servicing. Open the converter vent line
during filling. When it indicates 50 gallons or LOX
shutoff valve (20) and observe the converter full
starts to flow out the vent manifold, close the servicing
indicator gauge (19). The gauge will indicate GAS as
valve on the supply tank. Close the fill-drain line
the converter is filling, and when full, it will indicate
shutoff valve (3) to relieve internal pressure.
LIQUID.
As soon as it indicates LIQUID, disconnect the AF
filler valve (17), close the transfer tank pressure valve
CAUTION
(21), close the converter vent valve (20), and then
Use extreme caution when disconnecting the
disconnect the converter vent line connector (16).
transfer hose. Even though the hose has been drained
If no other converters are to be serviced, empty the
and the pressure relieved, some LOX will still
transfer tank, open the fill line shutoff valve (10), and
remain. Do not direct the hose toward personnel or
then the pressure buildup valve (21), if necessary, and
other equipment.
observe the liquid level gauge (13). When the transfer
tank is empty, close the pressure buildup valve (21) and
Disconnect the supply tank transfer hose,
then the fill line shutoff valve (10). Close all valves
immediately drain the LOX that remains, and replace
except the storage tank vent valve (5).
the coupling cap loosely. Tighten the cap after ensuring
that all LOX has vaporized and bled off. Close all
The flow of LOX from the storage tank to the
control valves on the service trailer except the storage
aircraft converter is done as follows and can be traced
tank vent valve (5).
using figure 8-3. The flow of LOX from the storage
8-7
