Safety Precautions to be Observed with Cooled Premixed GasesBr Med J 1968; 3 doi: https://doi.org/10.1136/bmj.3.5620.715 (Published 21 September 1968) Cite this as: Br Med J 1968;3:715
- A. Bracken,
- G. B. Broughton,
- D. W. Hill
The gas delivered from a cylinder of Entonox (50% nitrous oxide and 50% oxygen) may not contain adequate quantities of oxygen if the cylinder has been cooled and then allowed to warm up in a vertical position.
The composition of gas delivered from cylinders cooled to not lower than –40° C. remains unaltered if the cylinders are rewarmed for 24 hours in a horizontal position at a temperature of not less than 5° C.
Cylinders of Entonox delivered in cold weather should be stored in a horizontal position at 5° C. or more for at least 24 hours before use.