33 CFR 151.25: Oil Record Book requirements for ships
Last reviewed: October 14, 2026
This section requires certain oil tankers, ships and manned drilling rigs or platforms to keep an Oil Record Book. Entries must be made for listed machinery space, cargo/ballast and platform operations and for exceptional discharges. The book must be signed, kept aboard and available for inspection.
Applies toOil tankers of 150 gross tons and above, ships of 400 gross tons and above other than oil tankers, and manned fixed or floating drilling rigs or other platforms, with exceptions in paragraphs (l) and (m).
What it says
Each oil tanker of 150 gross tons and above, ship of 400 gross tons and above other than an oil tanker, and manned fixed or floating drilling rig or other platform must maintain an Oil Record Book Part I (Machinery Space Operations).
33 CFR 151.25(a)“shall maintain an Oil Record Book Part I (Machinery Space Operations).”
An oil tanker of 150 gross tons and above, or a non oil tanker that carries 200 cubic meters or more of oil in bulk, must also maintain an Oil Record Book Part II (Cargo/Ballast Operations).
33 CFR 151.25(a)“shall also maintain an Oil Record Book Part II (Cargo/Ballast Operations).”
Entries must be made on each occasion, on a tank to tank basis if appropriate, whenever a listed machinery space operation takes place, such as disposal of oil residue or bunkering of fuel or bulk lubricating oil.
33 CFR 151.25(d)“Entries shall be made in the Oil Record Book on each occasion, on a tank to tank basis if appropriate, whenever any of the following machinery space operations take place on any ship to which this section applies—”
Entries must be made on each occasion, on a tank to tank basis if appropriate, whenever a listed cargo/ballast operation takes place on an oil tanker to which this section applies, such as loading, transferring or unloading oil cargo.
33 CFR 151.25(e)“whenever any of the following cargo/ballast operations take place on any oil tanker to which this section applies—”
After an emergency, accidental or other exceptional discharge of oil or oily mixture, the Oil Record Book must contain a statement of the circumstances of, and the reasons for, the discharge.
33 CFR 151.25(g)“a statement shall be made in the Oil Record Book of the circumstances of, and the reasons for, the discharge.”
The person or persons in charge must sign each completed operation, and the master or other person having charge of the ship must sign each completed page.
33 CFR 151.25(h)“Each completed operation shall be signed by the person or persons in charge of the operations concerned and each completed page shall be signed by the master or other person having charge of the ship.”
The Oil Record Book must be kept on board the ship, in a place where it is readily available for inspection at all reasonable times.
33 CFR 151.25(i)“shall be kept in such a place as to be readily available for inspection at all reasonable times and shall be kept on board the ship.”
The Oil Record Book for a U.S. ship must be maintained on board for not less than three years.
33 CFR 151.25(k)“The Oil Record Book for a U.S. ship shall be maintained on board for not less than three years.”
Common questions
How long must an Oil Record Book be kept on board?
The Oil Record Book for a U.S. ship must be maintained on board for not less than three years.
“The Oil Record Book for a U.S. ship shall be maintained on board for not less than three years.”
Who is responsible for the Oil Record Book on a ship?
The master or other person having charge of a ship required to keep an Oil Record Book is responsible for maintaining the record.
“The master or other person having charge of a ship required to keep an Oil Record Book shall be responsible for the maintenance of such record.”
Where can a U.S. ship get an Oil Record Book?
Masters or operators of U.S. ships subject to this section can get a book printed by the U.S. Government from any Coast Guard Sector Office, Marine Inspection Office, or Captain of the Port Office.
“from any Coast Guard Sector Office, Marine Inspection Office, or Captain of the Port Office.”
Does the Oil Record Book rule apply to a barge that cannot discharge oil overboard?
No. This section does not apply to a barge or a fixed or floating drilling rig or other platform that is not equipped to discharge overboard any oil or oily mixture.
“This section does not apply to a barge or a fixed or floating drilling rig or other platform that is not equipped to discharge overboard any oil or oily mixture.”
The text of 33 CFR 151.25
Electronic Code of Federal Regulations (eCFR), current as of March 31, 2026 · Read it on eCFR
Oil Record Book
(a) Each oil tanker of 150 gross tons and above, ship of 400 gross tons and above other than an oil tanker, and manned fixed or floating drilling rig or other platform shall maintain an Oil Record Book Part I (Machinery Space Operations). An oil tanker of 150 gross tons and above or a non oil tanker that carries 200 cubic meters or more of oil in bulk, shall also maintain an Oil Record Book Part II (Cargo/Ballast Operations).
(b) An Oil Record Book printed by the U.S. Government is available to the masters or operators of all U.S. ships subject to this section, from any Coast Guard Sector Office, Marine Inspection Office, or Captain of the Port Office.
(c) The ownership of the Oil Record Book of all U.S. ships remains with the U.S. Government.
(d) Entries shall be made in the Oil Record Book on each occasion, on a tank to tank basis if appropriate, whenever any of the following machinery space operations take place on any ship to which this section applies—
(1) Ballasting or cleaning of fuel oil tanks;
(2) Discharge of ballast containing an oily mixture or cleaning water from fuel oil tanks;
(3) Disposal of oil residue;
(4) Discharge overboard or disposal otherwise of bilge water that has accumulated in machinery spaces;
(5) Bunkering of fuel or bulk lubricating oil; and
(6) Any failure, and the reasons for, of the oil filtering equipment.
(e) Entries shall be made in the Oil Record Book on each occasion, on a tank to tank basis if appropriate, whenever any of the following cargo/ballast operations take place on any oil tanker to which this section applies—
(1) Loading of oil cargo;
(2) Internal transfer of oil cargo during voyage;
(3) Unloading of oil cargo;
(4) Ballasting of cargo tanks and dedicated clean ballast tanks;
(5) Cleaning of cargo tanks including crude oil washing;
(6) Discharge of ballast except from segregated ballast tanks;
(7) Discharge of water from slop tanks;
(8) Closing of all applicable valves or similar devices after slop tank discharge operations;
(9) Closing of valves necessary for isolation of dedicated clean ballast tanks from cargo and stripping lines after slop tank discharge operations;
(10) Disposal of oil residue; and
(11) Any failure of, and the reasons for, the oil discharge monitoring and control system.
(f) Entries shall be made in the Oil Record Book on each occasion, on a tank-to-tank basis if appropriate, whenever any of the following operations take place on a fixed or floating drilling rig or other platform to which this section applies—
(1) Discharge of ballast or cleaning water from fuel oil tanks; and
(2) Discharge overboard of platform machinery space bilge water.
(g) In the event of an emergency, accidental or other exceptional discharge of oil or oily mixture, a statement shall be made in the Oil Record Book of the circumstances of, and the reasons for, the discharge.
(h) Each operation described in paragraphs (d), (e) and (f) of this section shall be fully recorded without delay in the Oil Record Book so that all the entries in the book appropriate to that operation are completed. Each completed operation shall be signed by the person or persons in charge of the operations concerned and each completed page shall be signed by the master or other person having charge of the ship.
(i) The Oil Record Book shall be kept in such a place as to be readily available for inspection at all reasonable times and shall be kept on board the ship.
(j) The master or other person having charge of a ship required to keep an Oil Record Book shall be responsible for the maintenance of such record.
(k) The Oil Record Book for a U.S. ship shall be maintained on board for not less than three years.
(l) This section does not apply to a barge or a fixed or floating drilling rig or other platform that is not equipped to discharge overboard any oil or oily mixture.
(m) This section does not apply to a fixed or floating drilling rig or other platform that is operating in compliance with a valid National Pollutant Discharge Elimination System (NPDES) permit.
(Approved by the Office of Management and Budget under control number 1625-0009)
The plain-English explanation on this page was written with AI from the regulation text above and checked automatically before publishing: every quote appears in the text, every number comes from it, and a second model confirmed each statement adds nothing the text doesn't say. Regulation text current as of March 31, 2026. The regulation text governs. RegKnot is not affiliated with the U.S. Coast Guard.