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Liquid Nitrogen: Difference between revisions
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* '''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! | * '''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!) | * 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!) | ||
* The sheepskin gloves and glasses are '''only to be used with LN2 and should be returned to the dewar area after use'''. No using them for welding or angle grinding for example! | * The sheepskin gloves and glasses are '''only to be used with LN2 and should be returned to the dewar area after use'''. No using them for welding or angle grinding for example! '''DO NOT USE ANY OTHER KIND OF GLOVES''' | ||
* '''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. | * '''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'''. | * Allow your thermos to stand for 30 seconds, half full, before filling further. '''Do not fill completely'''. | ||
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* '''Do not leave any LN2 un-watched at any time''' | * '''Do not leave any LN2 un-watched at any time''' | ||
* '''Do not carry LN2 in the lift or down the stairs to the basement!''' | * '''Do not carry LN2 in the lift or down the stairs to the basement!''' | ||
The LN2 should be dispensed using the dispenser hose. This is left '''UNATTACHED'''. To attach it: | |||
* remove the temporary bung | |||
* use the Alankey provided to tighten the bolts. | |||
* Check the valve on the lid is working and not jammed! | |||
* Tip the dewar slightly to one side to increase the pressure slightly | |||
* When you are finished, replace the bung | |||
Most of these are perhaps obvious, but its worth bearing them all in mind before you use any LN2. | Most of these are perhaps obvious, but its worth bearing them all in mind before you use any LN2. | ||
