12 17 1984 memorandum refers to 11 6 1981 letter description. Hazards associated with compressed gases include oxygen displacement fires explosions and toxic gas exposures as well as the physical hazards associated with high pressure systems. Indoors separate oxygen from fuel gas cylinders by at least 6 1 m 20 ft or by a wall at least 1 5 m 5 ft high with a minimum half hour fire resistance.
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