46 CFR § 98.30-6 - Vessels carrying IBCs.

---
identifier: "/us/cfr/t46/s98.30-6"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 98.30-6 - Vessels carrying IBCs."
title_number: 46
title_name: "Shipping"
section_number: "98.30-6"
section_name: "Vessels carrying IBCs."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "I"
subchapter_name: "CARGO AND MISCELLANEOUS VESSELS"
part_number: "98"
part_name: "SPECIAL CONSTRUCTION, ARRANGEMENT, AND OTHER PROVISIONS FOR CERTAIN DANGEROUS CARGOES IN BULK"
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. 1903; 46 U.S.C. 3306, 3307, 3703; 49 U.S.C. App. 1804; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGFR 65-50, 30 FR 17022, Dec. 30, 1965, unless otherwise noted."
cfr_part: "98"
---


# 98.30-6 Vessels carrying IBCs.

Intermediate Bulk Containers (IBCs) with a classification of 31A may be used on a vessel to which this part applies and must meet at a minimum the following constructional requirements:

(a) The shell thickness must be a minimum 6.36 mm (0.25 inches) in reference steel.

(b) There must be a self-closing relief valve set to open at no less than 5 psig.

(c) Closures used on fill openings, in excess of 20 square inches, must be equipped with a device to prevent them from fully opening without first relieving internal pressure.

(d) All venting requirements must be followed in accordance with 49 CFR 178.345-10, Table 1.

[USCG-2011-0088, 78 FR 54786, Sept. 6, 2013]