This Standard specifies procedures on safe practices for filling gas cylinders for self-contained underwater breathing apparatus (SCUBA) and non-underwater self-contained breathing apparatus (SCBA) where the breathing gas is compressed atmospheric air. Filling methods recommended are compressing of atmospheric air and decant filling of compressed atmospheric air.There are extremely high risks involved in the compressing or decanting of breathing gases and gas mixtures with more than 22% oxygen and these procedures are outside the scope of this Standard.WARNING: SEVERE COMPATIBILITY PROBLEMS WILL OCCUR IF OXYGEN-ENRICHED MIXTURES ARE INTRODUCED INTO EQUIPMENT PREVIOUSLY USED FOR BREATHING AIR. THESE MAY RESULT IN THE INSTANTANEOUS RELEASE OF EXTREMELY LARGE AMOUNTS OF ENERGY.

First published in part as part of AS CB4 Supplement 3-1974.AS CB4 Supplement 4 first published 1974.AS CB4 Supplement 3-1974 revised and redesignated AS 2705-1984.AS CB4 Supplement 4-1974 revised and redesignated AS 2704-1984.AS 2704-1984 and AS 2705-1984 revised, amalgamated and redesignated in part as AS 3848.2-1999. First published in part as part of AS CB4 Supplement 3-1974. AS CB4 Supplement 4 first published 1974. AS CB4 Supplement 3-1974 revised and redesignated AS 2705-1984. AS CB4 Supplement 4-1974 revised and redesignated AS 2704-1984. AS 2704-1984 and AS 2705-1984 revised, amalgamated and redesignated in part as AS 3848.2-1999.