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46 CFR § 35.30-10 - Cargo tank hatches, ullage holes, and Butterworth plates—TB/ALL.

---
identifier: "/us/cfr/t46/s35.30-10"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 35.30-10 - Cargo tank hatches, ullage holes, and Butterworth plates—TB/ALL."
title_number: 46
title_name: "Shipping"
section_number: "35.30-10"
section_name: "Cargo tank hatches, ullage holes, and Butterworth plates—TB/ALL."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "D"
subchapter_name: "TANK VESSELS"
part_number: "35"
part_name: "OPERATIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1321(j); 46 U.S.C. 3306, 3703, 6101, 70011, 70034; 49 U.S.C. 5103, 5106; Executive Order 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Executive Order 12777, 56 FR 54757, 3 CFR, 1991 Comp., p. 351; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGFR 65-50, 30 FR 16704, Dec. 30, 1965, unless otherwise noted."
cfr_part: "35"
---

# 35.30-10 Cargo tank hatches, ullage holes, and Butterworth plates—TB/ALL.

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.