• Oil: Petroleum in any form including crude oil, fuel oil, sludge, oil refuse and refined products
• Crude oil: Any liquid hydrocarbon mixture occurring naturally in the earth
• Oil tanker: A ship constructed or adapted primarily to carry oil in bulk
• Crude oil tanker: An oil tanker engaged in the trade of carrying crude oil
• Product carrier: An oil tanker engaged in the trade of carrying oil other than crude oil
• Combination carrier: A ship designed to carry either oil or solid cargoes in bulk
• Nearest land: The term "from the nearest land" means from the baseline from which the territorial sea of the territory is established
• Special area: A sea area where for recognized technical reasons in relation to its oceanographical and ecological condition and to the particular character of its traffic the adoption of special mandatory methods for the prevention of sea pollution by oil is required
• Special Areas List (for this annex):

1. the Mediterranean Sea
2. the Baltic Sea area
3. the Black Sea
4. the Red Sea
5. the Gulf of Aden
6. the Antarctic area
7. the North West European waters (includes North Sea, Celtic Sea, English Channel)
8. the Oman area of the Arabian Sea
9. the Southern South African waters

• Unless expressly provided otherwise, the provisions of this Annex shall apply to all ships.

• Any ship such as hydrofoil, air-cushion vehicle, near-surface craft and submarine craft etc.
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• The Admin may waive the requirements of regulations 29, 31 and 32 of this Annex, for any oil tanker which engages exclusively on voyages both of 72 h or less in duration and within 50 nautical miles from the nearest land

• Regulations 15 and 34 of this Annex shall not apply to:

1. The discharge into the sea of oil or oily mixture necessary for the purpose of securing the safety of a ship or saving life at sea
2. the discharge into the sea of oil or oily mixture resulting from damage to a ship or its equipment, only when all the precaution are taken to avoid such a situation

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• The Administration may allow any fitting, material, appliance or apparatus to be fitted in a ship as an alternative to that required by this Annex if such fitting, material, appliance or apparatus is at least as effective as that required by this Annex.

• Every oil tanker >= 100 GT & other ships >= 400 GT, are subject to following surveys to ensure that the structure, equipment, systems, fittings, arrangements and material fully comply with the applicable requirements of this Annex:

1. Initial Survey: Before the ship is put in service or before the Certificate (IOPPC) is issued for the first time.
2. Renewal Survey: <= 5 years.
3. Intermediate Survey: Within 3 months before/after 2nd/3rd Anniversary Date of the Certificate.
4. Annual Survey: Within 3 months before/after each anniversary date.
5. Additional Survey: Either general or partial, according to the circumstances such as major repair, replacement of the approved items/machinery as per this Annex.

• The Administration must appoint a competent surveyor officer to carry out various surveys. Such an officer holds the power to dismiss a vessel until its defects are rectified.

• An International Oil Pollution Prevention Certificate (IOPPC) shall be issued upon successful initial/renewal survey to an oil tanker >= 150GT or another ship >= 400 GT.

• A Govt of a party to this convention, upon request by the Admin, shall do a survey of their vessel and upon satisfaction, issue IOPPC.
• A copy of such certificate must be submitted to th Admin as soon as possible.

• The International Oil Pollution Prevention Certificate shall be at least English, French or Spanish. If an official language of the issuing country is also used then its advised to keep a translation copy in above said languages.

• IOPPC must be issued for <= 5 years.
• If renewal of cert not done within 3 months of anniversary date, then new cert shall be valid from the date of completion of the renewal survey to a date not exceeding five years from the date of expiry of the existing certificate.
• If at the time of the survey, ship is not in port, then a max extension of 3 months shall be allowed, only to allow it to reach the survey port.
• If the flag of the ship is changed then existing cert becomes invalid and new cert is issued by the new govt within 3 months of transfer to that flag.

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• A ship when in a port of another Party is subject to inspection by officers duly authorized, where there are clear grounds for believing that the master or crew are not familiar with essential shipboard procedures relating to the prevention of pollution by oil, in such a case the Party shall take such steps as will ensure that the ship shall not sail until the situation has been brought to order in accordance with the requirement of this Annex.

• Each ship >= 400 GT, shall be provided with tanks of appropriate capacity to collect sludge based upon the length of voyage, condition of machinery etc.
• Shall have no discharge connections to the bilge system, oily bilge water holding tank(s), tank top or oily water separators except that the tank(s) may be fitted with drains, with manually operated self-closing valves and arrangements for subsequent visual monitoring of the settled water, that lead to an oily water holding tank or bilge well, or an alternative arrangement, provided such arrangement does not connect directly to the bilge piping system.
• Oil residue (sludge) may be disposed of directly from the oil residue (sludge) tank(s) through the standard discharge connection.
• Piping to and from oil residue (sludge) tanks shall have no direct connection overboard.

• To enable pipes of reception facilities to be connected with the ship's discharge pipeline for residues from machinery bilges and from oil residue (sludge) tanks, both lines shall be fitted with a standard discharge connection in accordance with the following table:

• Any Ship 400 <= GT < 10000, shall be fitted with Oil Filtering Equipment which has to be of a design approved by the Administration and shall be such as will ensure that any oily mixture discharged into the sea after passing through the system has an oil content not exceeding 15 ppm.
• Any Ship GT >= 10000 shall be equipped as per above paragraph. But in addition, it shall be provided with alarm arrangements to indicate when this level cannot be maintained. The system shall also be provided with arrangements to ensure that any discharge of oily mixtures are automatically stopped when the oil content of the effluent exceeds 15 ppm.
• Ships GT < 400 GT, to retain on board oil or oily mixtures for subsequent discharge to reception facilities if vessel en-route, OWS operated @ 15 ppm restriction, oily mixture does not originate from cargo pump-room bilges on oil tankers

• Discharges Outside Special Areas

1. Ship En-Route
2. Oily mixture is processed through OWS @ ppm <= 15
3. Oily mixture does not originate from cargo pump-room bilges on oil tankers
4. Oily mixture, in case of oil tankers, is not mixed with oil cargo residues

• Discharges in Special Areas

1. Ship En-Route
2. Oily mixture is processed through OWS @ ppm <= 15
3. OWS to be equipped with 15 ppm Alarm and automatic stopping arrangement
4. Oily mixture does not originate from cargo pump-room bilges on oil tankers
5. Oily mixture, in case of oil tankers, is not mixed with oil cargo residues

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• In respect of the Antarctic area, any discharge into the sea of oil or oily mixtures from any ship shall be prohibited
• If there are visible oil traces on surface of sea water, then Govt of parties to this convention must inspect the cause & contentment of such cause.
• No chemical to be discharged in any way in any concentration (hazard to marine ecology)
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• The oil residues which cannot be discharged into the sea in compliance with this regulation shall be retained on board for subsequent discharge to reception facilities

• Ship GT >= 4000 (delivery 31 Dec 79), Oil Tanker >= 150 (delivery after 31 Dec 79), no ballast water shall be carried in any oil fuel tank.
• Contaminated Ballast Water to discharge to Shore Facility and entry made in ORB-1.
• After 1 July 1982, oil shall not be carried in a forepeak tank or a tank forward of the collision bulkhead

• Oil Tanker GT >= 150, Other Ship GT >= 400, shall be provided with an Oil Record Book Part I (Machinery space operations).
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• The Oil Record Book Part I shall be completed on each occasion, on a tank-to-tank basis if appropriate, whenever any of the following machinery space operations takes place in the ship:

1. ballasting or cleaning of oil fuel tanks
2. discharge of dirty ballast (cleaning water) from oil fuel tanks
3. collection and disposal of oil residues (sludge)
4. discharge of bilge water to sea/shore facility
5. bunkering of fuel or bulk lubricating oil
6. internal tank-tank transfers

• In case of accidental discharge of oil, and report must be attached in ORB-1 stating the reasons for such discharge.
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• Each completed operation shall be signed by the officer or officers in charge of the operations concerned and each completed page shall be signed by the master of ship.
• Any failure of the oil filtering equipment shall be recorded in the Oil Record Book Part I.

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• The Administration may allow continued operation of a Category 2 or 3 oil tanker of 15 years and over after the date of its delivery, if satisfactory results of the Condition Assessment Scheme warrant that, in the opinion of the Administration, the ship is fit to continue such operation, provided that the operation shall not go beyond the anniversary of the date of delivery of the ship in 2015 or the date on which the ship reaches 25 years after the date of its delivery, whichever is the earlier date.

• For the purpose of this regulation heavy grade oil means any of the following:

1. Crude oils having a density at 15°C higher than 900 kg/m3
2. Oils, other than crude oils, having either a density at 15°C higher than 900 kg/m3 or a kinematic viscosity at 50°C higher than 180 mm2/s

• If an oil tanker of 600<= GT < 5000, GT >= 5000 has satisfactory CAS, then it shall be allowed to carry heavy grade oil of 900 <= density <= 945 (kg/m3) until it reaches the age of 25 years from the date of its delivery.
• Admin has right to void the above said statement at any time if not satisfied.
• Govt of any Party to the Convention, shall prohibit the entry of a vessel as said in the above para, on the grounds of safety of their property.

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• This regulation applies to oil tankers of 5,000 tonnes deadweight and above constructed on or after 1 January 2007.
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• The pump-room shall be provided with a double bottom such that at any cross-section the depth of each double bottom tank or space shall be such that the distance h between the bottom of the pump-room and the ship's baseline measured at right angles to the ship's baseline is not less than h = 1 m (min).

• Oil Tankers GT >= 150, slop tanks must be provided.
•  The total capacity of the slop tank(s) shall be minimum 3% of the oil-carrying capacity of the ship.
•  Adequate means shall be provided for cleaning the cargo tanks and transferring the dirty ballast residue and tank washings from the cargo tanks into a slop tank.
• Slop tanks shall be so designed, particularly in respect of the position of inlets, outlets, baffles or weirs, so as to avoid excessive turbulence and entrainment of oil or emulsion with the water.
• Oil tankers GT >= 70000 (delivery 31 Dec 79) must have at least 2 slop tanks.

• In every oil tanker, a discharge manifold for connection to reception facilities shall be located on the open deck on both sides of the ship.
• Oil Tanker GT >= 150, pipelines for the discharge to the sea of ballast water or oil-contaminated water from cargo tank areas shall be led to the open deck or to the ship's side above the waterline in the deepest ballast condition. Means shall be provided for stopping the discharge into the sea.
• Every oil tanker delivered after 1 June 1982, required to be provided with segregated ballast tanks or fitted with a crude oil washing system.
• On every oil tanker at sea, dirty ballast water or oil-contaminated water from tanks in the cargo area, other than slop tanks, may be discharged by gravity below the waterline, provided that sufficient time elapsed in order to allow oil/water separation to have taken place and the ballast water been examined immediately before the discharge with an oil/water interface detector.
• Every oil tanker of 150 gross tonnage and above delivered on or after 1 January 2010, which has installed a sea chest that is permanently connected to the cargo pipeline system,shall be equipped with both a sea chest valve and an inboard isolation valve. In addition to these valves, sea chest shall be capable of isolation from the cargo piping system,while the tanker is loading, transporting,or discharging cargo by use of a positive means.

• Oil tankers of 150 gross tonnage and above shall be equipped with an oil discharge monitoring and control system.
• The system shall be fitted with a recording device to provide a continuous record of the discharge in litres per nautical mile and total quantity discharged, or the oil content and rate of discharge. This record shall be identifiable as to time and date and shall be kept for at least three years.
• The oil discharge monitoring and control system shall come into operation when there is any discharge of effluent into the sea and shall be such as will ensure that any discharge of oily
• mixture is automatically stopped when the instantaneous rate of discharge of oil exceeds that permitted by Admin
• Instructions as to the operation of the system shall be in accordance with an operational manual approved by the Administration. They shall cover manual as well as automatic operations and shall be intended to ensure that at no time shall oil be discharged