Operation Manual

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Specification Data
3.7 Use of Liquid Nitrogen
Fitment of metal parts with the aid of liquid nitrogen can be carried out only in a workshop.
Beware of liquid nitrogen coming into contact with the skin. Never touch undercooled parts
with bare hands. Use pliers or other suitable tool when placing parts into liquid nitrogen.
Application of liquid nitrogen
For minor work of short duration it will be sufficient to have two concentric containers of varying
diameter placed into each other and to have the clearance between the two containersfilled with
the mineral wool, cork meal or sand.
To begin with, pour the nitrogen into the special basin and then dip the parts into this liquid. The
start of the undercooling process is indicated by heavy "boiling". Bubbles will form until the parts
have assumed the nitrogen temperature of - 196° C. Once no more bubbles form, the part is ready
for fitment.
Quantity of nitrogen needed
Under normal conditions, one kilogram of metal to be cooled from +15° to -196° C requires the
following quantity of liquid nitrogen:
Steel 0,60 litres
Aluminium 0,96 litres
Bronze, copper, brass 0,45 litres
Cast iron 0,66 litres
3.7
3-5-01
S/BVM 628
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