U.S. Code of Federal Regulations
Regulations most recently checked for updates: Oct 23, 2019
(a) Each tank in oxygen service must be provided with a manhole as prescribed in Section VIII of the ASME Code (IBR, see § 171.7 of this subchapter).
(b) Each tank having a manhole must be provided with a means of entrance and exit through the jacket, or the jacket must be marked to indicate the manway location on the tank.
(c) A manhole with a bolted closure may not be located on the front head of the tank.