Cryogenic liquids

Cryogenic liquids are those liquefied gases which have very low boiling points such as oxygen, nitrogen, argon, etc. Although individual cryogenic liquids may exhibit particular properties, some of which present quite severe hazards, for example, the fire risk associated with liquid oxygen, ALL cryogenic liquids present two principal hazards:

a) Very low temperatures and the risk of serious personal injury or material damage;

b) Very high liquid-to-gas expansion ratios and the risk of over pressurisation of holding vessels.

And, with the exception of oxygen, cryogenic liquids present a third principal hazard of oxygen deficiency and the risk of asphyxiation.

The policy document contains further information on the properties of cryogenic liquids and guidance and procedures for using them safely.

Enhanced Good Chemical Practice for Cryogenic Liquids (PDF 95KB) 

Appendix 1 Cryogenic liquid hazards (PDF 86KB) 

Appendix 2 Cryogenic liquid properties (PDF 50KB) 

Appendix 3 Oxygen depletion calculations (PDF 87KB) 

Appendix 4 Emergency action and First-aid (PDF 60 KB) 

Appendix 5 Fill Procedure (PDF 45KB)

Carriage of liquid nitrogen by road -model assessment 

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