StacksVerified U.S. regulatory reference

49 CFR §178.338-6

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (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).
  2. (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.
  3. (c)A manhole with a bolted closure may not be located on the front head of the tank.