33 C.F.R. § 168.05
As used in this part-
Disabled tanker means a tanker experiencing a loss of propulsion or steering control.
Double hull tanker means any self-propelled tank vessel that is constructed with both double bottom and double sides in accordance with the provisions of 33 CFR 157.10d .
Escort transit means that portion of the tanker's voyage through waters where escort vessels are required.
Escort vessel means any vessel that is assigned and dedicated to a tanker during the escort transit, and that is fendered and outfitted with towing gear as appropriate for its role in an emergency response to a disabled tanker.
Laden means transporting in bulk any quantity of applicable cargo, except for clingage and residue in otherwise empty cargo tanks.
Single hull tanker means any self-propelled tank vessel that is not constructed with both double bottom and double sides in accordance with the provisions of 33 CFR 157.10d .
Tanker master means the licensed onboard person in charge of the tanker.
Tanker owner or operator means the owner or shoreside organization (individual, corporation, partnership, or association), including a demise charterer, responsible for the overall management and operation of the tanker.
33 C.F.R. §168.05