Operating the Device
20
3.7 Pressure build-up
• Close the withdrawal valve (V1) and the waste gas / overflow valve (V3).
• Open the pressure build-up valve (V2).
• Watch the pressure indicator (DM).
•
Close the pressure build-up valve (V2) as soon as the needle reaches the
red marking or nitrogen comes out of the pressure relief valve (PSV).
Fig. 6: Pressure gauge
3.8 Withdrawal of liquid nitrogen
•
Connect the liquid nitrogen line to the device which shall be supplied with
liquid nitrogen and to the connection (SA) of the Autofill.
•
Open the filling and withdrawal valve (V1).
•
After taking the liquid, close the filling and withdrawal valve (V1) again.
3.9 Pressure relief
• Close the pressure build-up valve (V2).
• Open the waste gas valve (V3).
3.10 Transport
CAUTION
Risks of liquid or gaseous nitrogen
Positive pressure in the vessel
–
The introduction of energy during transport can cause a sudden surge in
pressure. Nitrogen is blown off then and this can cause a lack of oxygen,
cryogenic burns, oxygen enrichment and associated risks.
•
Make sure the vessel is depressurised before you transport it,
•
Remove the siphon and put in the transport plugs.
•
Transport the vessel only in an upright position.
•
Avoid impacts and vibrations.
•
Secure the vessel against falling down, rolling away and damage.
DM
