StacksVerified U.S. regulatory reference

46 CFR §35.30-10

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
No cargo tank hatches, ullage holes, or Butterworth plates shall be opened or shall remain open without flame screens, except under the supervision of the senior members of the crew on duty, unless the tank opened is gas free.