Each compressed gas cylinder must—

1. (a) Be stored in a ventilated area;
2. (b) Be protected from excessive heat;
3. (c) Be prevented from falling;
4. (d) Be tested after any repair, modification, or alteration to the pressure boundaries as set forth in § 197.462; and

5. (e) Meet the requirements of—

   1. (1) Part 54 of this chapter; or
   2. (2) 49 CFR 173.34 and 49 CFR part 178, subpart C.