The storage tank vent line shutoff valve (11)
is used to control the release of gaseous vapors
from the storage tank to the vent piping manifold.
This valve is open during filling to vent all pressure
from the storage tank. During idle storage, it is
left open to vent all vapors generated by normal
LOX boil-off. In flight line service, it is left closed
to prevent oxygen vapor contact with flammable
liquids or vapors, and to prevent unnecessary loss
OPERATION. The following procedures
describe LOX flow in connection with filling
the TMU 70/M storage tank and the servicing
of an aircraft converter, using the trailer.
The flow description is keyed to figure 5-8.
Figure 5-8.TMU-70/M liquid oxygen servicing trailer storage tank schematic diagram.