StacksVerified U.S. regulatory reference

46 CFR §197.452

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The diving supervisor shall ensure that equipment used with oxygen or oxygen mixtures greater than 40 percent by volume is cleaned of flammable materials—
  1. (a)Before being placed into service; and
  2. (b)After any repair, alteration, modification, or suspected contamination.