34
Lib
er
at
ors
Repair Procedures
XII
RP23 – Empty Unit (Figure 22)
a. Place one end of the transfer line (Item A) into a suitable
cryogenic container such as an empty, clean Liberator dewar.
Connect a male transfer line adapter (Item B) to the other end
of the line.
b. Connect the adapter to the Liberator QDV (Item 15), keeping
the vent valve (Item 41) closed.
c. Liquid oxygen will be discharged from the open end of the
transfer line into the empty container. Continue process until
Liberator is empty.
d. If Liberator has no pressure, pressurize with the following
procedure.
1. Connect regulator (Item C) to oxygen gas source.
2. Connect pneumatic hose (Item D) to regulator and
Liberator DISS Fitting (Item E).
3. Adjust regulator (Item C) to supply up to 1,4 bar (20 psig).
4. Set Liberator FCV (Item 24) to 6 LPM setting.
5. Continue until Liberator is empty.
RP24 – Warm Unit (Figure 23)
a. Liberator may be allowed to sit (FCV off, vent closed) a mini-
mum of 48 hours after emptying.
b. To warm a Liberator more quickly:
1. Connect regulator (Item C) to oxygen or nitrogen gas
source.
2. Connect pneumatic hose (Item D) to regulator (Item C) and
male pneumatic adapter (Item F).
3. Adjust regulator to 1,4 bar (20 psig). Open vent valve (Item
41) to allow slow venting.
4. Allow Liberator to vent for 1-1/2 hours minimum after vent
valve (Item 41) defrosts.
D
E
15
B
A
C
24
41
F
D
C
41
FIGURE 22:
Emptying Unit
FIGURE 23:
Warming Unit
WARNING:
Make sure open end of transfer line remains inside
cryogenic container. Wear insulated gloves and eye protection
when using this procedure. DO NOT reuse liquid oxygen.
NOTE: Female transfer line adapter should be substituted for
item B in top fill version.
Liberators Technical Service Manual • PN 13350704 Rev
K
