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Posted By Roger Uncles
Some advice please, Can anyone tell me or where I can get information with regards to Liquid Nitrogen. What I need to know can it be canted back into the flask once it has been used? Or should it be allowed to dissipate views please.
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Posted By Eric Taylor
Rodger,
We use liquid nitrogen most days for assembling items with an interference fit. From an engineering point of view, it can be returned to the cryogenic flask it is stored in with no problems. You might want to pour it through a mesh or filter if it gets contaminated with anything in use. It does tend to boil/bubble quite violently as you put things in it so appropriate risk assessments and PPE need to be looked at. We have specialised gloves/full face mask and apron.
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Posted By SIMON HOWES
You can only reuse it if you are absolutely confident as to the identity and purpose of the second user.
If it has or may have been been contaminated with grease, oxidising agents, potential catalysts etc etc etc you need to bin it.
If you do bin it you need to have a designed system/bit of kit for doing so or you will have a disaster
It's cheaper than beer - chuck it away
Simon
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Posted By Stephen D. Clarke
Hi,
The British Compressed Gases Association Code of Practice CP30, entitled "The safe use of liquid nitrogen dewars up to 50 litres." might help. This is a very comprehensive guide which provides all the information that is needed for risk assessment and safe handling of liquid nitrogen in the laboratory setting.
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Posted By Heather Aston
Simon
This is nitrogen not oxygen - I don't think there's likely to be a contamination problem from grease etc. Are you thinking of the issue of oxygen cylinders having grease on the regulators, which could cause an explosion? Doesn't apply here - anything that goes into the liquid will freeze solid and can be easily filtered out mechanically as suggested above.
As for having a disaster by binning liquid nitrogen - not very likely unless you let it boil off in a totally enclosed room where it displaces all the oxygen. For small amounts I would just let it boil off into the open air.
Heather
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Posted By garyh
This may sem a bit dumb, however, why not just ask your Liquid Nitrogen supplier? Incidentally, does the (M)SDS cover this? Have you been sent an up to date copy?
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