Title 46 › Subtitle Subtitle II— Vessels and Seamen › Part B— Inspection and Regulation of Vessels › Chapter 37— CARRIAGE OF LIQUID BULK DANGEROUS CARGOES › § 3703a
Tank ships that carry oil in bulk must have a double hull when they work in U.S. waters, including the U.S. Exclusive Economic Zone. Some boats are not covered. Those exceptions include vessels used only for oil or hazardous spill response; ships under 5,000 gross tons that have a double containment system the Secretary finds just as good as a double hull; ships already documented and fitted with a double hull before August 12, 1992; certain barges under 1,500 gross tons carrying refined fuel in specified Alaskan and Arctic waters west of 155° west longitude; and vessels in the National Defense Reserve Fleet. Age of a vessel is figured from the later of its delivery after original construction, delivery after a major conversion, or the date the Coast Guard set its salvage value for a wrecked-vessel document. Small vessels (under 5,000 gross tons) with building or conversion contracts made before June 30, 1990 and delivered before January 1, 1994, and vessels declared wrecked with Coast Guard salvage values set before June 30, 1990 and documented as wrecked before January 1, 1994, cannot operate in U.S. waters unless they have a double hull or an approved equivalent double containment system. Vessels built or converted under those early contracts or wrecked before those dates must have a double hull once they reach certain ages: 5,000–15,000 tons or 15,000–30,000 tons must have a double hull when 25 years old with a single hull or 30 years old with a double bottom or double sides; ships 30,000 tons or more must have one when 23 years old with a single hull or 28 years old with a double bottom or double sides. No single-hull tank vessel may operate after January 1, 2010, and no vessel with only a double bottom or double sides may operate after January 1, 2015. Barges in the National Defense Reserve Fleet operating outside the waters mentioned above must follow any conditions the Secretary requires. Gross tonnage is the tonnage the Secretary would have recognized on July 1, 1997, unless reliable evidence shows a lawful reduction was made 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 5, 2026
Release point: 119-73not60