Bunkers Convention 2001: civil liability for bunker oil

Background: the bunker-pollution gap before 2001

The international oil pollution liability architecture that emerged from the Torrey Canyon casualty of 1967 was deliberately limited to persistent oil cargo carried in tankers. The CLC 1969 instrument, its 1992 Protocol, and the layered IOPC Fund 1992 regime were drafted on the understanding that the contributor base was the global crude and persistent product trade. A bulk carrier loaded with iron ore that grounded and discharged 800 tonnes of intermediate fuel oil fell entirely outside the regime, even though the coastal damage was indistinguishable from a tanker incident of the same magnitude.

For the first three decades after Torrey Canyon the gap was tolerable because bunker tank capacities on the typical 1970s and 1980s general cargo ship, bulker, and container vessel were modest in absolute terms. The regulatory frame relied on traditional maritime tort, the LLMC Convention adopted at IMCO in 1976, and bilateral or domestic statutes such as the US Oil Pollution Act 1990. Victims of bunker spills from non-tanker vessels nonetheless frequently confronted three difficulties: shipowner identity obscured behind one-ship companies, an asset base limited to the wreck and freight, and no compulsory insurance or direct-action right against the P&I Club.

Vessel sizes and bunker capacities grew steadily through the 1990s and into the 2000s. By the late 2010s an 18,000 TEU ULCS routinely loaded 8,000 to 10,000 tonnes of HFO and VLSFO for a single Asia-Europe rotation; Capesize bulkers carry 4,000 to 6,000 tonnes; modern car carriers, RoPax ferries, and large cruise ships routinely exceed 5,000 tonnes of bunker. A single grounding can release a quantity of persistent fuel oil comparable to a small product-tanker incident, with the same coastal-damage profile. By the late 1990s the IMO Legal Committee had concluded that the absence of a Bunkers regime was an indefensible gap in the polluter-pays edifice.

The IMO Council placed a Bunkers Convention on the Legal Committee work programme in 1996. A Diplomatic Conference convened in London from 19 to 23 March 2001 and adopted the Convention by consensus. Entry-into-force conditions under Article 14 required ratification by 18 States including 5 with at least 1 million GT; the threshold was met when Sierra Leone deposited the eighteenth instrument in November 2007, and the Convention entered into force on 21 November 2008. The European Union pushed Member State accession through Council Decision 2002/762/EC.

CLC scope vs Bunkers scope: cargo oil vs bunker oil

The dividing line between CLC 1992 and Bunkers 2001 is not the type of vessel but the source of the oil that caused the pollution. CLC 1992 covers any incident in which persistent oil carried as cargo or in the bunker tanks of a laden oil tanker is discharged. Bunkers 2001 covers any incident in which bunker oil from any other ship is discharged. Article 1.5 defines “bunker oil” as “any hydrocarbon mineral oil, including lubricating oil, used or intended to be used for the operation or propulsion of the ship, and any residues of such oil,” capturing HFO, IFO, MGO, MDO, VLSFO compliant with MARPOL Annex VI since 2020, lubricating oils, and oily-water separator and sludge residues.

A laden VLCC therefore falls under CLC for both her cargo and her bunkers, because Article I.1 of CLC defines a “ship” as one constructed or adapted for the carriage of oil in bulk as cargo and treats it as a ship under CLC only when actually carrying oil in bulk and on the following voyage unless residues are absent. A bulk carrier that has never carried oil in bulk falls under Bunkers 2001 in respect of any release from her fuel tanks. A combination carrier in ballast on a non-oil leg falls under Bunkers 2001 unless residues remain, in which case CLC continues to apply.

The persistent / non-persistent distinction also matters at the boundary. CLC 1992 applies only to persistent oil: crude oil, heavy fuel oil, lubricating oil, and most heavy distillates. Bunkers 2001 applies to all bunker oil without a persistent / non-persistent qualifier, because the policy rationale was to fill the CLC gap and nearly all marine bunker fuel except marine gas oil is persistent. A spill of marine gas oil under the Bunkers regime is technically covered, although in practice MGO evaporates within hours and rarely produces actionable damage.

2001 adoption and 2008 entry into force

The Diplomatic Conference adopted the Convention on 23 March 2001 with one resolution annexed concerning limitation. The text contains 19 substantive articles and a Final Act. Entry-into-force conditions under Article 14 required ratification by 18 States, including 5 States each with ships of not less than 1 million GT, ensuring major flag States entered before the Convention took effect.

Ratifications accelerated through 2005 and 2006 as the European Union pushed Member State accession, and reached the threshold on 21 November 2007 when Sierra Leone deposited. The Convention entered into force one year later on 21 November 2008. By 2010 the Convention bound approximately 60 States including the United Kingdom, Germany, France, Norway, the Netherlands, Greece, Singapore, Hong Kong, Japan, the Marshall Islands, Liberia, Panama, the Bahamas, Cyprus, and Malta, capturing more than 90 percent of world merchant tonnage. The figure stood at approximately 95 States by 2025.

Notable non-parties include the United States (which operates under OPA 90) and several developing States that have not yet completed accession. A non-party-flagged vessel calling at a State Party port may still be required to demonstrate financial security under Article 7.12.

Strict liability of the registered owner (extended definition)

Article 3.1 establishes the foundation rule: “Except as provided in paragraphs 3 and 4, the shipowner at the time of an incident shall be liable for pollution damage caused by any bunker oil on board or originating from the ship, provided that, if an incident consists of a series of occurrences having the same origin, the liability shall attach to the shipowner at the time of the first of such occurrences.” Liability is strict: the claimant need not prove negligence, breach of statutory duty, or unseaworthiness. The mere fact of a discharge of bunker oil that causes pollution damage attaches liability to the shipowner.

The concept of “shipowner” in Bunkers 2001 is materially broader than in CLC 1992. Article 1.3 defines “shipowner” as “the owner, including the registered owner, bareboat charterer, manager and operator of the ship.” This four-part definition is the structural innovation of the Convention. Under CLC 1992 the liable party is the registered owner alone, with claims against managers, charterers, and operators expressly channelled away under Article III.4. Bunkers 2001 deliberately departs from that pure channelling architecture: it preserves a measure of channelling but expands the set of channellees inside the cone of liability.

The four categories operate as follows.

Registered owner is the person registered as owner in the flag State register, or in the absence of such a register the person owning the ship. This is the same concept as in CLC 1992.

Bareboat charterer (“demise charterer”) is the entity that has hired the bare ship from the owner under a bareboat charter, taking full operational and crewing responsibility, and stands in the position of an owner pro hac vice.

Manager is the entity providing technical, crewing, or commercial management services under a management agreement, frequently structured as a BIMCO SHIPMAN 2009 contract. Many one-ship companies appear on the register as registered owner while operations are conducted by a third-party ship manager headquartered in Hamburg, Limassol, Singapore, or Mumbai.

Operator is a residual category capturing any other entity exercising operational control: a time charterer with bunker-procurement responsibility, an in-house operating company within a corporate group, or a commercial operator under a pool agreement.

The breadth of the definition makes evasion through corporate structuring more difficult: if the registered owner is a one-ship Liberian company with no recoverable assets, the claimant can pursue the manager or operator directly. It also brings the manager and operator firmly within the compulsory insurance regime under Article 7.

Joint and several liability under Article 3.4

Article 3.4 closes the architecture: “Where an incident involving two or more ships occurs and pollution damage results therefrom, the shipowners of all the ships concerned, unless exonerated under paragraph 3, shall be jointly and severally liable for all such damage which is not reasonably separable.” The same joint-and-several principle applies among the four categories of “shipowner” within a single ship under Article 1.3. The claimant may pursue any one of the four for the full amount of the loss, leaving the defendants to allocate liability among themselves through subsequent indemnity actions or contractual recourse.

The practical effect is that a coastal State or private claimant facing a Wakashio-class spill from a Capesize bulker can serve proceedings on the registered owner (typically a Marshall Islands single-ship vehicle), the bareboat charterer if any, the technical manager (often a major Greek, German, or Singaporean ship management group), and the operator (a chartering arm or pool), in any forum where jurisdiction lies, claiming the entire loss against any one of them. The defendants resolve the internal allocation under their charter party indemnities, the management agreement liability schedule, and P&I Club rules of mutuality. From the claimant’s perspective the four defendants are a single solvent target backed by the same Blue Card.

Channelling with a broader liable-party set

Article 3.5 contains the negative channelling rule that completes the architecture: “No claim for compensation for pollution damage shall be made against the shipowner otherwise than in accordance with this Convention. Subject to paragraph 6, no claim for compensation for pollution damage under this Convention or otherwise may be made against: (a) the servants or agents of the shipowner or the members of the crew; (b) the pilot or any other person who, without being a member of the crew, performs services for the ship; (c) any charterer (howsoever described, including a bareboat charterer), manager or operator of the ship, other than a shipowner…” with further sub-paragraphs barring claims against salvors, persons taking preventive measures, and their respective employees.

Article 3.5(c) channels claims away from charterers, managers, and operators other than those who fall within the Article 1.3 definition of “shipowner”. Because Article 1.3 brings bareboat charterers, managers, and operators inside the “shipowner” group, those entities remain liable under Article 3.1 while non-included parties (time charterers without operational responsibility, voyage charterers, sub-charterers, agents, brokers) are channelled out. The result is a wider channelling cone than CLC 1992 but narrower than full open tort liability.

Article 3.6 mirrors CLC 1992: the channelling does not affect any right of recourse of the shipowner against third parties and does not apply where the damage resulted from a personal act or omission committed with intent to cause such damage, or recklessly and with knowledge that such damage would probably result. Successful breakthroughs are rare.

Limitation of liability via LLMC 1976/1996 (no Bunkers-specific cap)

The defining structural feature of Bunkers 2001, and the chief practical contrast with CLC 1992, is that it contains no Convention-specific limit of liability. Article 6 reads: “Nothing in this Convention shall affect the right of the shipowner and the person or persons providing insurance or other financial security to limit liability under any applicable national or international regime, such as the Convention on Limitation of Liability for Maritime Claims, 1976, as amended.”

CLC 1992 contains a self-contained sliding-scale cap from approximately 4.5 to 89.77 million SDR. Bunkers 2001 defers to whichever LLMC regime binds the forum State. Three direct consequences follow.

First, the applicable limit depends on the forum State’s LLMC ratification status, not the Convention itself. A spill in UK territorial waters (LLMC 1996 Protocol with 2012 amendments) faces a different limit than a spill in a State that ratified only LLMC 1976.

Second, the limit is calibrated to a property-claims regime designed for general maritime claims, not oil pollution. The LLMC Convention originated as a successor to the 1957 Convention on Limitation of Liability of Owners of Sea-Going Ships, drafted to limit collision and cargo-claim exposure. Its limits are an order of magnitude lower than CLC for equivalent-size vessels.

Third, absence of a supplementary fund means that once the LLMC limit is exhausted, the residual loss falls on the claimant. There is no second-tier oil-receivers pool, no Supplementary Fund, and no flag- or coastal-State safety net. Wakashio brought this gap into sharp focus.

2012 LLMC amendments: tiered limits from 1.51 million to ~80 million SDR

The LLMC 1976 Convention was amended by the 1996 Protocol and again by IMO Resolution LEG.5(99) adopted on 19 April 2012, which raised the property-claims limits by approximately 51 percent. The 2012 amendments entered into force on 8 June 2015 under the tacit acceptance procedure. The current property-claims limits applicable to Bunkers Convention claims in States Party to LLMC 1996 with the 2012 amendments are calculated under Article 6.1(b) of the 1996 Protocol as amended.

A typical Capesize bulker of 90,000 GT faces a property limit of approximately 42.6 million SDR, roughly USD 57 million at a long-run SDR-USD rate of 1.34. A ULCS container ship of 200,000 GT faces approximately 80.2 million SDR, roughly USD 108 million. The figure of “21.4 million SDR for ships up to 2,000 GT” cited in some industry summaries applies to the personal-injury column under Article 7 of LLMC, not the property column relevant to pollution.

To invoke limitation the shipowner constitutes a limitation fund in a court of competent jurisdiction, deposits the SDR amount converted to local currency, and obtains an order declaring the fund the sole pool for admitted claimants. Distribution is pro rata; on completion the shipowner is discharged subject only to the intentional-or-reckless-misconduct breakthrough under Article 4 of LLMC.

Bunkers Blue Card under Article 7

Article 7 contains the compulsory insurance regime: “The registered owner of a ship having a gross tonnage greater than 1,000 registered in a State Party shall be required to maintain insurance or other financial security, such as the guarantee of a bank or similar financial institution, to cover the liability of the registered owner for pollution damage in an amount equal to the limits of liability under the applicable national or international limitation regime, but in all cases, not exceeding an amount calculated in accordance with the Convention on Limitation of Liability for Maritime Claims, 1976, as amended.”

Compliance is evidenced by a Bunkers Convention Certificate issued by the flag State, carried on board and produced on demand to any port State, supported by a Bunkers Blue Card issued by the financial-security provider, almost universally an International Group P&I Club under the global pooling and reinsurance arrangements.

The Blue Card workflow mirrors the CLC Blue Card workflow: the shipowner enters the ship in an International Group P&I Club; the Club issues a Blue Card to the flag State certifying pollution cover to LLMC limits; the flag State (or its delegated RO) issues the Bunkers Convention Certificate, valid for the policy year (typically 20 February to 20 February) and renewed annually; on Club withdrawal, mid-year sale, or change of flag, the Club withdraws the Blue Card and the flag State withdraws the certificate.

A ship without a valid Bunkers Certificate must not enter or leave a port in a State Party (Article 7.11). Port State Control under the Paris and Tokyo MOUs routinely verifies the certificate during initial inspection and detains vessels with expired or missing certificates. The certificate is a primary trading document on a par with the Safety Construction, Safety Equipment, and IOPP certificates required under MARPOL Annex I.

Compulsory insurance threshold: ships above 1,000 GT

The 1,000 GT threshold under Article 7.1 represents a deliberate carve-out for small craft, fishing vessels, and inshore traffic. Below 1,000 GT no compulsory insurance certificate is required, although strict liability under Article 3 applies regardless of size. The threshold captures essentially the entire seagoing merchant fleet that operates internationally: container ships, bulkers, tankers (also covered for bunkers under Bunkers 2001 in addition to CLC for their cargo on laden voyages), general cargo, RoRo, RoPax, cruise ships, large fishing vessels, offshore supply vessels, and large yachts.

States Party frequently extend equivalent compulsory insurance regimes to smaller vessels through national legislation: the UK Merchant Shipping Act 1995 as amended, the German Seerechtsänderungsgesetz, and the Australian Protection of the Sea (Civil Liability for Bunker Oil Pollution Damage) Act 2008 all extend the compulsory cover principle below the international threshold.

The 1,000 GT line is not aligned with the LLMC 1996 base tonnage of 2,000 GT, below which limits sit at a fixed lump sum. A 1,500 GT coaster requires a Bunkers Certificate but pays the LLMC fixed-sum limit; a 950 GT coaster pays the same LLMC fixed-sum limit but is exempt from compulsory insurance. The asymmetry reflects different drafting traditions a quarter-century apart.

Convention scope: territory, territorial sea, and EEZ

Article 2 defines the geographic reach of Bunkers 2001: “This Convention shall apply exclusively: (a) to pollution damage caused in the territory, including the territorial sea, of a State Party, and in the exclusive economic zone of a State Party established in accordance with international law, or, if a State Party has not established such a zone, in an area beyond and adjacent to the territorial sea of that State determined by that State in accordance with international law and extending not more than 200 nautical miles from the baselines from which the breadth of its territorial sea is measured; (b) to preventive measures, wherever taken, to prevent or minimise such damage.”

The EEZ inclusion is the Convention’s widest net. A bunker spill 150 nm offshore in a State Party’s EEZ triggers liability, compulsory insurance, and direct-action rights exactly as a harbour spill would. The phrase “wherever taken” for preventive measures means that response costs incurred on the high seas by a vessel that intercepts the slick before it reaches the EEZ are recoverable as a Convention head of damage.

Two categories of damage fall outside the regime regardless of geography: pollution damage in non-State Party waters (where the Convention does not apply at all unless the vessel is flag-State-Party-registered), and wreck-removal costs that exceed the insurance cover and fall outside the LLMC ceiling in States Party to the Nairobi Wreck Removal Convention 2007 (in force 14 April 2015), which operates its own compulsory insurance and direct-action regime on parallel tracks.

Relationship to CLC 1992: the complementary pair

The two conventions form a complementary pair covering the entire field of oil pollution from ships. The boundary follows the source of the spilled oil and the operational status of the vessel. CLC 1992 handles cargo-and-bunker pollution from laden oil tankers; Bunkers 2001 handles bunker pollution from all other ships and from tankers in ballast on non-oil voyages. The substantive liability rule (strict, with identical defences in war, hostilities, force majeure, and third-party intentional act) is materially aligned, as are direct action against the insurer, jurisdiction in the State of damage, recognition of judgments, and the six-years-from-incident / three-years-from-damage time-bar.

The principal differences are five.

Liable-party set. CLC channels to the registered owner alone; Bunkers 2001 captures the four-party group under Article 1.3.

Limitation regime. CLC self-contains its sliding-scale limit running from approximately 4.5 million SDR to 89.77 million SDR; Bunkers 2001 defers to LLMC.

Tonnage threshold for compulsory insurance. CLC 1992 requires insurance for tankers carrying more than 2,000 tonnes of persistent oil cargo; Bunkers 2001 requires insurance for ships above 1,000 GT.

Supplementary compensation. CLC sits beneath the IOPC Fund 1992 and the optional Supplementary Fund Protocol 2003; Bunkers 2001 has no fund tier.

Geographic scope. Both Conventions apply to pollution damage in the territory, territorial sea, and EEZ of a State Party, and to preventive measures wherever taken.

The Conventions are not mutually exclusive on every voyage. A laden VLCC in the EEZ of a State Party to both falls under CLC for any spill of cargo or bunkers. The same VLCC in ballast on a non-oil voyage falls under Bunkers 2001 unless cargo residues remain. A combination carrier with ore on the laden leg falls under Bunkers 2001; the same vessel on the next laden leg with crude falls under CLC.

No Bunkers-specific compensation fund

The single most consequential structural difference is the absence of a supplementary fund at the Bunkers level. CLC 1992 sits at Tier 1 of a layered system: shipowner liability up to 89.77 million SDR (Tier 1), IOPC Fund 1992 supplementary compensation up to a combined 203 million SDR (Tier 2), and the optional Supplementary Fund Protocol 2003 raising the combined cap to 750 million SDR (Tier 3). For a tanker incident in a State Party to all three tiers, claimants can recover up to 750 million SDR before bearing residual loss.

For a Bunkers incident the sole tier is shipowner liability up to the LLMC limit, capped at approximately 80 million SDR even for the largest container ships. Where actual loss exceeds the LLMC limit (Wakashio in Mauritius, arguably Rena in New Zealand), residual loss falls on the claimant: coastal-State cleanup, fishery and tourism losses, and private property damage all stop at the LLMC ceiling.

The drafting choice in 2001 to omit a fund reflected three considerations. The IOPC contributor base does not transpose: bunker fuel is consumed by ships rather than received by terminals, so a vessel-side levy would have required an entirely new collection architecture. Major States, including the United States and several Pacific Rim coastal States, opposed a new fund before observing whether the LLMC ceiling proved adequate. Political appetite for a new IMO fund treaty in the 2000s was limited following the troubled negotiation of the HNS Convention 1996, which struggled to reach entry into force, was amended by Protocol in 2010, and remains short of ratifications as of 2025.

Defences under Article 3.3

Article 3.3 provides that the shipowner is not liable if the damage resulted from: “(a) an act of war, hostilities, civil war, insurrection or a natural phenomenon of an exceptional, inevitable and irresistible character; (b) an act or omission done with intent to cause damage by a third party; or (c) the negligence or other wrongful act of any Government or other authority responsible for the maintenance of lights or other navigational aids in the exercise of that function.”

These three defences mirror CLC 1992 Article III.2 and are construed narrowly. The “natural phenomenon” defence requires a causal chain entirely outside human action and has not succeeded in any publicised case since CLC entry into force. The third-party intentional act defence requires that the third party’s act was the proximate cause of the spill, not that negligence on the ship’s part contributed. A shipowner who negligently maintained the hull so that a third-party collision caused a rupture would not meet the defence if the structural weakness was a concurrent cause.

Article 3.3 differs from MARPOL’s enforcement regime: a ship that qualifies for the Article 3.3 defence is still subject to the MARPOL reporting obligation under Annex I Regulation 37 SOPEP. The SOPEP duty is operational; liability exemption is civil.

Major incidents: Cosco Busan 2007, Rena 2011, Wakashio 2020

The Convention has been tested in practice by three signature casualties whose facts shape the post-2020 reform debate.

Cosco Busan, San Francisco Bay, 7 November 2007. The 901 TEU container ship struck a fender at the San Francisco Bay Bridge in heavy fog, opening a 220-foot gash in the port side that breached two bunker tanks. Approximately 220 tonnes of intermediate fuel oil 380 discharged into the Bay, contaminating 26 miles of shoreline, killing approximately 6,800 birds, and closing crab and herring fisheries. The casualty occurred before Convention entry into force and in waters of the United States, a non-party. Recovery proceeded under OPA 90 and California state law; total recoveries exceeded USD 70 million, as documented in the US NTSB report MAR-09-01. The case is the canonical example of why Bunkers liability was needed: a non-tanker incident causing tanker-scale damage.

Rena, Astrolabe Reef off Tauranga, New Zealand, 5 October 2011. The 1990-built Liberian-flag container ship, on charter to MSC, grounded at approximately 17 knots in clear weather after the watchkeeping officer altered course toward a waypoint without verifying position. Approximately 350 tonnes of heavy fuel oil discharged from breached bunker tanks during the prolonged salvage that ultimately resulted in total loss. New Zealand was a State Party from 2009. The owner’s P&I Club (the Swedish Club) responded under the Blue Card. Total cleanup, salvage, wreck removal, and ecological restoration costs exceeded NZD 660 million, well above the LLMC limit applicable to the 47,000 GT vessel. The shortfall was absorbed through commercial settlement beyond the LLMC fund, by the New Zealand government, and by affected commercial interests.

Wakashio, Pointe d’Esny, Mauritius, 25 July 2020. The 2007-built Panamanian-flag Capesize bulker, in ballast and on charter to Mitsui OSK Lines, grounded on the coral reef off the south-east coast of Mauritius with 3,894 tonnes of VLSFO and 207 tonnes of MDO on board. After two weeks of unsuccessful refloat attempts the hull cracked on 6 August 2020 and approximately 1,000 tonnes of VLSFO discharged into a UNESCO Ramsar wetland and surrounding coral lagoon. The owner was a single-ship Panamanian company; the manager a major Japanese shipmanagement group; the Blue Card was issued by Japan P&I Club. Total damage estimates ranged from USD 200 million to USD 1 billion. The LLMC limit applicable to the 101,932 GT vessel under Mauritian law was approximately USD 65 million.

The Wakashio response generated four settlement streams: a USD 9.4 million owner ex gratia payment announced August 2020; a USD 90 million Mauritius-Japan bilateral settlement announced March 2021 by Mitsui OSK Lines; commercial settlements with affected fishery and tourism interests; and a small recovery within the LLMC fund constituted in Panamanian and Mauritian courts. The aggregate fell well short of full damage recovery. Mauritius openly criticised the LLMC ceiling and absence of a Bunkers fund as inadequate to the scale of the incident.

Post-Wakashio EU and IMO reform debate

The Wakashio gap triggered a structured policy response across three forums.

The European Parliament debated the case in plenary on 15 September 2020 and adopted a resolution calling for review of the international liability and compensation framework for non-tanker pollution. The Commission was tasked under DG MOVE to evaluate options including a supplementary fund, expansion of CLC scope, or a new EU-only instrument.

The IMO Legal Committee, from its 108th session in July 2021, accepted a proposal from a coalition of small island developing States led by the Marshall Islands, the Solomon Islands, and Palau, supported by France and several EU Member States, to study a supplementary bunker fund comparable to the IOPC Fund 1992 but financed by a vessel-side levy. Three architectures were explored: a tonnage-based annual levy on vessels above a threshold, a per-call port levy, and a per-tonne-bunkered levy collected by suppliers.

The MEPC engaged with the issue at MEPC 79, 80, and 81 (March 2024). As of mid-2025 no instrument had been adopted: the Legal Committee had not converted the work into a draft Convention text, and the IMO political calendar was concentrated on the revised GHG strategy and Annex VI mid-term measures. Industry positions divided between the International Group of P&I Clubs (cautiously open subject to concerns about double cover), the Round Table associations (BIMCO, ICS, Intercargo, Intertanko: opposed without a clear contributor-base proposal), and the SIDS coalition (strongly in favour). Correspondence-group work without near-term formal adoption is the most likely 2025-2027 outcome.

The core obstacle is contributor architecture. The IOPC Fund collects its levy from oil receivers at destination: terminals, refineries, and importers who received more than 150,000 tonnes of contributing cargo in the prior year pay a per-tonne contribution. Bunker fuel is consumed not received, so the terminal-receiver model does not map onto a bunker levy. A bunker-supplier levy would require a new global collection mechanism with no existing precedent in IMO law, creating implementation challenges for the Legal Committee drafters and political resistance from bunkering hubs including Singapore, Rotterdam, and Fujairah.

Per-state ratification status

The Convention bound approximately 95 States as of mid-2025, representing more than 92 percent of world tonnage. Major flag States in force include Panama, Liberia, the Marshall Islands, Hong Kong, Singapore, the Bahamas, Malta, Cyprus, Greece, the United Kingdom, Norway, Denmark, Germany, France, the Netherlands, Italy, Spain, Japan, and the Republic of Korea. Major coastal States in force include Australia, New Zealand, Canada, India, China, Indonesia, Malaysia, Thailand, Vietnam, Egypt, South Africa, Brazil, Argentina, Chile, and the Russian Federation.

Notable non-parties include the United States (operating under OPA 90), Mexico, several Pacific Island States that have signed without depositing instruments, and a handful of Sub-Saharan African and Central American States. The volume of seagoing tonnage under non-party flag is small. A non-party flag is no obstacle to enforcement: any non-party-flag ship calling at a State Party port must demonstrate a Bunkers Certificate or equivalent financial security under Article 7.12.

Bulk-carrier and container-ship operator implications

The Convention has been universally absorbed into the operational compliance baseline of the dry-cargo and container shipping sectors since 2008. Ships above 1,000 GT cannot trade internationally without a valid Bunkers Convention Certificate, and the certificate has joined the IOPP, ISM, ISPS, and MLC certificates as a primary trading document. The cost of compliance is largely embedded in the standard P&I Club entry: pollution cover is provided as part of the basic mutual entry up to the Club’s contractual ceiling (typically USD 1 billion under the International Group pooling agreement), well above the LLMC ceiling applicable to the largest vessels.

For a Capesize bulker of 90,000 GT trading global iron ore and coal routes, the practical implications are uninterrupted P&I Club entry, prompt Blue Card and Bunkers Certificate renewal, due diligence on management agreements to ensure the manager and operator are within the Article 1.3 chain, maintenance of the SOPEP under Annex I Regulation 37, and structural compliance with Regulation 12A oil fuel tank protection for vessels delivered after 1 August 2010.

For a ULCS container ship of 200,000 GT carrying 8,000 to 10,000 tonnes of VLSFO, the larger bunker capacity drives a heightened risk profile, careful Regulation 12A bunker tank arrangement, attention to charter party indemnity provisions positioning time and slot charterers inside or outside the Article 1.3 group, and operational discipline around bunkering operations where a substantial share of bunker spills historically occur within port.

For RoPax and cruise ships the Bunkers regime interlocks with the Special Areas regime under Annex I and the ECA regime under Annex VI: a vessel calling at multiple State Party ports must demonstrate Bunkers Certificate compliance at each, alongside fuel-quality compliance under Annex VI.

P&I Club bunker pollution cover mandatory above 1,000 GT

The International Group of P&I Clubs comprises thirteen mutual marine insurance Clubs that provide third-party liability cover for approximately 90 percent of world ocean-going tonnage. Pollution cover, including bunker pollution under Bunkers 2001, is a standard rule of every Club rule book and forms part of the basic mutual entry without separate premium. The International Group Pooling Agreement lays off claims above each Club’s retention through a multi-Club pool, and above that through the Group Excess Loss Reinsurance Programme placed annually in the international reinsurance market, providing combined cover up to approximately USD 8 billion per incident at recent renewals.

The Blue Card is issued by the entered Club to the flag State on behalf of the registered owner, recites shipowner name, ship name and IMO number, the period of cover, and certifies that cover meets or exceeds the applicable LLMC limit. Where the registered owner is a one-ship company within a larger ship-management group, the Blue Card extends to the manager and operator under the Article 1.3 group. On mid-year sale, change of flag, or change of manager the Club withdraws and reissues.

Sub-limits within the Club rules typically reflect the LLMC ceiling rather than imposing a separate Bunkers cap. The International Group Schedule of Cover caps oil pollution at USD 1 billion per occurrence under standard rules, well above the LLMC ceiling for any vessel size. Reinsurance capacity has been available since 2008 with no evidence of constraint following Wakashio 2020.

A Bunkers claim almost always reaches the Club through the Article 7.10 direct-action right: “Any claim for compensation for pollution damage may be brought directly against the insurer or other person providing financial security for the registered owner’s liability for pollution damage.” This mirrors CLC 1992 Article VII.8 and gives claimants an enforceable target regardless of the registered owner’s solvency or corporate structure.

Comparison with US OPA 90

The United States is not a party to Bunkers 2001 and treats bunker spills under the Oil Pollution Act 1990 (OPA 90) on the same footing as cargo spills from oil tankers. OPA 90 imposes strict liability under section 1002 on any “responsible party” for the discharge or substantial threat of discharge of oil into navigable waters, the adjoining shorelines, or the EEZ. The “responsible party” definition under section 1001(32) includes the owner and operator of the vessel, paralleling but not identical to the Bunkers Article 1.3 group.

A non-US-flag vessel trading to the United States from a Convention State Party is subject to both regimes for the same incident: Bunkers Convention for damage in the EEZ of a State Party, OPA 90 for damage in US navigable waters, shorelines, or EEZ. The higher US limit and Trust Fund supplement apply on the US side; the LLMC limit applies on the Convention-State side.

The OPA 90 limitation forfeiture standard is materially lower than the Bunkers / LLMC intentional-or-reckless threshold. OPA 90 limits are forfeited where the spill resulted from gross negligence, wilful misconduct, or violation of any applicable Federal safety or operating regulation, or where the responsible party failed to report or to cooperate with response. That lower bar increases litigation risk for operators trading to US ports.

Relationship to MARPOL Annex I operational discipline

Bunkers 2001 is a post-incident liability instrument; MARPOL Annex I is a pre-incident operational instrument. The two work together as the prevention and remediation halves of the same policy field.

Annex I imposes operational discipline on every aspect of fuel-oil and oily-water handling: construction under Regulation 12A for protective fuel-tank location (ships above 600 m³ fuel capacity delivered after 1 August 2010), oily-water filtering under Regulations 14 and 15, Oil Record Book entries under Regulation 17, and the SOPEP under Regulation 37. Compliance reduces the probability of an incident that triggers Bunkers liability.

When prevention fails (a grounding, allision, hull breach, transfer overflow) the Bunkers regime takes over: strict liability, direct action against the Club, LLMC limitation, distribution of the fund.

Two Annex I provisions interlock especially closely with Bunkers liability. Regulation 12A reduces the probability and severity of bunker tank rupture in groundings, materially reducing expected loss for post-2010 vessels. Regulation 37 SOPEP planning provides the operational framework for preventive measures under Bunkers Article 1.7, the costs of which are recoverable as a head of damage. Owners with fully exercised SOPEPs are positioned both to minimise actual damage and to recover their response costs from the limitation fund or directly from the Club.

The related calculator for the MARPOL Annex I/37 Shipboard Oil Pollution Emergency Plan assists operators in assessing SOPEP compliance thresholds, and the IMO Bunkers 2001 Liability calculator helps quantify LLMC exposure by GT.

Limitations

This article presents the Bunkers Convention 2001 as adopted and the LLMC 1996 Protocol as amended by Resolution LEG.5(99), both as in force in mid-2025. Several caveats apply.

LLMC forum dependency. Every liability figure cited here assumes the forum State has ratified LLMC 1996 with the 2012 amendments. States bound only by LLMC 1976 apply different limits. Practitioners must verify the applicable LLMC regime for the specific forum before advising on exposure.

Non-party exposure. The United States, Mexico, and a small number of other States are non-parties. Claims arising in their waters are governed by domestic law (OPA 90 in the US case) rather than the Convention. A vessel’s Bunkers Certificate does not satisfy the US COFR requirement.

Bunkers Fund status. As of mid-2025 the IMO Legal Committee has not adopted a Bunkers Fund instrument. The reform debate is ongoing; practitioners should monitor MEPC and LEG Committee outputs for developments that could alter the second-tier compensation picture.

SDR conversion. All SDR amounts cited must be converted using the IMF SDR rate on the date of fund constitution or claim assessment. The long-run rate of USD 1.34 per SDR used in worked examples is not guaranteed; the actual rate fluctuates daily.

Article 4 breakthrough. LLMC limitation can be broken under Article 4 on proof of intentional or reckless conduct by the shipowner personally. This is a rare but non-zero risk for operators with documented structural-maintenance failures, as the Erika criminal proceedings demonstrated.

National extension. Several States Party have extended the compulsory insurance requirement below 1,000 GT through domestic legislation. Operators of smaller vessels should verify the law of each State Party port they call at.

See also

• CLC 1992: civil liability for oil pollution damage
• IOPC Fund 1992: International Oil Pollution Compensation Fund
• LLMC 1976/1996/2012: limitation of liability for maritime claims
• LLMC: Convention on Limitation of Liability for Maritime Claims
• MARPOL Annex I: oil pollution prevention
• MARPOL Annex I Regulation 37: SOPEP
• MARPOL Annex I Regulation 12A: oil fuel tank protection
• MARPOL Convention overview
• Calculators index

Related calculators

• IMO Bunkers 2001 - Bunker Oil Pollution Liability
• Bunker Convention 2001 - Liability Scope
• HNS Convention 2010 - Hazardous Cargo Liability
• IMO CLC - Civil Liability for Oil Pollution
• BWM Convention - Discharge Locations
• Chartering - LLMC Liability Cap
• MARPOL Annex I/37 - Shipboard Oil Pollution Emergency Plan
• IMO OPRC 1990 - Oil Pollution Preparedness Response