Papers And Originals

Safety Precautions to be Observed with Cooled Premixed Gases

Br 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
  1. A. Bracken,
  2. G. B. Broughton,
  3. D. W. Hill

    Abstract

    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.