7.2 Removing the control head
Proceed as follows:
Check that there is no liquid nitrogen in
the tank and it has been dried with dry
air.
1. Open the vent valve (2); Close the
filling/withdrawal valve (1). Close the pressure-
building valve (3).
Ensure that the vent valve (2) is open
before doing anything else.
2. Unclip and remove the clamping ring (5).
3. Lift the control head (4) out of the tank and
place it
on a suitable support
.
Mind the height when removing the head. Do not
knock the control head against the inner wall of the
tank. Do not lose the metal seal between the
control head and the neck of the tank.
4. Remove the seal from the tank flange.
5. Put a stopper into the neck to keep moisture from
entering the tank.
4
5
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