Liquid Nitrogen

The following is a short, distilled safety brief on the Liquid Nitrogen (LN2) that we have at the space.

We currently have a 50 Litre Dewar in a locked cage on the ground floor, next to the Laser cutter. This space was chosen for its proximity to the loading dock and a series of vents in the rear windows.

It is locked when not in use and is to remain locked when not in use.

Gloves and thermos flasks for transportation are provided.

Everyone who wishes to use LN2 for any purpose should make sure for their safety, and for these around them, that they know how to use LN2 safely.

The following are some important safety points.

• Rule 0 - Do not be on *icy* fire! (remember, cold things burn too!)
• Wear appropriate clothing - This should be clothing that has long sleeves, tight cuffs and the special cryogenic gloves provided. Do not wear any other kind of gloves or any clothing that has significant folds, creases or places where any splashed liquid could pool. Wear footwear that covers the entire foot, i.e no sandals!
• Use the unsealed, thermos flasks provided, for the decanting of LN2. DO NOT USE ANY FORM OF SEALED CONTAINER! (It will explode and make a mess of your face or someone elses!)
• SLOWLY decant LN2 in the first instance - This allows the spout to cool. The escaping gas will also chill your thermos so be prepared for it to get cold. This is useful as it pre-chills your flask.
• Allow your thermos to stand for 30 seconds, half full, before filling further. Do not fill completely.
• Do not carry LN2 very far - The further you carry it, the bigger the risk. Make sure your way is clear and there are no trip hazards. This is a common occurrence at the space at present.
• Do not touch any exposed metal work on the dewar! - The hose/spout at the top of the dewar can become very cold, and indeed, anything surrounding it.
• Moving LN2 around the hackspace must be done in an unsealed, thermos flask - Do not, for example, use a mug from the kitchen!
• Do not allow any LN2 to come into contact with bare skin
• Lock the cage surrounding the dewar when you have finished
• If you see anything obviously wrong with the LN2 storage, inform the mailing list and the main IRC hackspace channel.
• Do not leave any LN2 un-watched at any time

Most of these are perhaps obvious, but its worth bearing them all in mind before you use any LN2.