Compressed gas cylinders.

Each compressed gas cylinder must— (a) Be stored in a ventilated area; (b) Be protected from excessive heat; (c) Be prevented from falling; (d) Be tested after any repair, modification, or alteration to the pressure boundaries as set forth in § 197.462; and (e) Meet the requirements of— (1) Part 54 of this chapter; or (2) 49 CFR 173.34 and 49 CFR part 178, subpart C.