15
Lib
er
at
ors
VIII
Operation
Liberator 20, 30, 37, 45 and 60 units may be moved about or
transported in a vehicle while full without damage; however, they
should not be dropped or handled roughly in order to prevent
necktube damage.
Filling
NOTE: The fill source should have the correct fitting (5/8” x 45°
male flare) to connect to transfer line.
WARNING: Filling must be performed in a well-ventilated area
to prevent development of an oxygen-enriched atmosphere.
WARNING: Wear insulated gloves and eye protection when-
ever working with liquid oxygen.
1. Fill Source Preparation
a. Ensure the source contains a sufficient amount of liquid
oxygen to completely fill the reservoir.
b. Ensure the liquid oxygen in the fill source is saturated at
2,4-3,4 bar (35-50 psig).
NOTE: Proper saturation is critical when filling a CAIRE reservoir.
If the fill source is not properly saturated, the unit will not func-
tion correctly, resulting in inaccurate flow rates and excessive
boil off of liquid oxygen. This will cause portable units which are
filled off the reservoir to act in the same manner. Please refer to
the Saturation Principles section to learn more about the impor-
tance of proper saturation.
2.
Fill Procedure
a.
Required Equipment:
o Fill source as outlined above
o Liquid oxygen transfer line
o Appropriate transfer line fill adapter
o Appropriate vent valve wrench
o Eye protection
o Pressure gauge
o Insulated gloves
NOTE: Ensure Compliance with All Local Regulations when
Filling LOX Reservoir Units.
b. Verify that the liquid level meter is operating properly.
NOTE: If liquid level meter operates improperly, refer to
Troubleshooting section of the corresponding technical manual.
c. Connect transfer line to fill source. Connect proper transfer
line adapter to transfer line.
d. Fully open liquid valve on fill source.
e. Purge transfer line for a minimum of 5 seconds ensuring
gas is safely piped away from operator:
i. Connect transfer hose fill adapter to a securely
mounted mating QDV.
-OR-
ii. If the transfer hose fill adapter is equipped with a
male QDV, push the adapter poppet against an unpainted
stainless steel surface.
f. Wipe both reservoir and transfer line adapter fill connec-
tors with lint free rag to remove residual moisture.
NOTE: Purge the transfer line any time fill source valve has been
closed.
g.
Using vent valve wrench, fully open reservoir vent valve.
h.
Connect transfer line to reservoir to begin fill.
i.
While filling, throttle the vent valve with the vent valve
wrench as needed to keep the reservoir pressure at the nom-
inal fill pressure of 1,38 bar (20 psig). Monitor the pressure
by connecting a pressure gauge to the oxygen outlet and
open the FCV to 2LPM or greater.
If filling pressure is not monitored, it must be ensured that
the Liberator has reached its correct operating pressure
prior to patient use, or incorrect flow rates may result.
j.
When liquid flows from the vent outlet, terminate the fill by
disconnecting the transfer line fill adapter from the reservoir
using the reservoir’s pop-off assembly.
k.
Close reservoir vent valve immediately after disconnecting
the transfer line from the reservoir.
Caution:
Do not allow excessive venting of liquid oxygen through
the vent valve. Prolonged exposure may freeze the vent valve in
the open position.
Replace protective cover on the QDV adapter. Close the
liquid valve on the fill source and properly store the
transfer
line and fill adapter.
Verify that the liquid level meter indicates full.
NOTE: The liquid level indicating system is only accurate after
the vent valve is closed, and the oxygen has stabilized for five min-
utes.
l.
m.
Liberators Technical Service Manual • PN 13350704 Rev
K
