Title 46 › Subtitle Subtitle II— - Vessels and Seamen › Part Part B— - Inspection and Regulation of Vessels › Chapter CHAPTER 37— - CARRIAGE OF LIQUID BULK DANGEROUS CARGOES › § 3703a
Tank vessels that carry oil in bulk must have a double hull when they operate in U.S. waters, including the Exclusive Economic Zone. There are a few exceptions: vessels used only to respond to oil or hazardous spills; ships under 5,000 gross tons (or an alternate tonnage approved by the Secretary) that have an approved double containment system; vessels already fitted with a double hull before August 12, 1992; barges under 1,500 gross tons carrying refined petroleum in parts of the Bering Sea, Chukchi Sea, Arctic Ocean, nearby waters, the Aleutian Islands, and the Alaskan Peninsula west of 155 degrees west longitude; and vessels in the National Defense Reserve Fleet under section 57100. A vessel’s age is the later of its delivery after original build, delivery after a major conversion, or the date the Coast Guard set its appraised salvage value when it qualified as a wrecked vessel under section 12112. Certain ships with contracts or salvage dates before June 30, 1990 (and delivered or qualified before January 1, 1994) must have a double hull or an equally effective double containment system to operate in U.S. waters. Specific size-and-age cutoffs require double hulls: 5,000–<15,000 gross tons and 15,000–<30,000 gross tons at 25 years for single hulls or 30 years with double bottom/sides; 30,000+ gross tons at 23 years for single hulls or 28 years with double bottom/sides. Single-hull vessels may not operate after January 1, 2010, and vessels with only double bottoms or double sides may not operate after January 1, 2015. Barges in the reserve fleet that operate outside the specified waters must follow conditions set by the Secretary. Gross tonnage for these rules is the tonnage the Secretary would have recognized on July 1, 1997, unless reliable evidence shows a lawful reduction before that date.
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Shipping — Source: USLM XML via OLRC
Legislative History
Reference
Citation
46 U.S.C. § 3703a
Title 46 — Shipping
Last Updated
Apr 6, 2026
Release point: 119-73