Welding or cutting, or both, on containers which have held flammable
or combustible solids, liquids, or gases, or have contained substances
which may produce flammable vapors or gases will not be attempted until
the containers have been thoroughly cleaned, purged, or inerted in
strict accordance with the rules and procedures embodied in American
Welding Society Pamphlet A-6.0-65, edition of 1965.
[35 FR 1015, Jan. 24, 1970]