46 CFR § 197.338 - 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