Bunker quality claims are seldom lost on the chemistry. They are lost on privity, on a contractual notice period, on the wrong sample, or on the assumption that an Indian admiralty court will give the buyer a vessel to arrest. The claim turns on four prior questions: who is in contract with whom; what the terms say about specification, sampling and time; what the contractual sample proves; and where security can actually be found. On the last of these, Indian law departs sharply from the received wisdom.

Who can sue whom

The typical chain runs from physical supplier to contractual seller or trader, to time charterer, to owner. On time-chartered tonnage the charterer provides and pays for fuel, so the supply contract is the charterer’s, not the owner’s. The owner’s claim lies against the charterer under the charterparty; liability then passes down the chain, contract by contract, each with its own law and forum clause.

An owner proceeding directly against a supplier with whom it never dealt has no contractual claim. It must sue in negligence, with all the difficulty that attends recovery of economic loss, or take an assignment of the charterer’s rights. Pleading the owner as contractual claimant against the physical supplier is the first and most avoidable error.

The Bunker Convention 2001 does not assist. It channels third-party pollution liability to the registered owner. It confers no right of action on a buyer against a supplier and has no bearing on a quality claim unless fuel escapes.

The terms decide most cases

Supplier terms do most of the work. They fix the specification, usually ISO 8217, and the edition matters: contracts still incorporate the 2010 and 2017 editions alongside ISO 8217:2024. They also fix the sampling regime, a notice window measured in days, a time bar for commencing proceedings, a cap on liability (commonly the price of the fuel delivered) and an exclusion of consequential loss. Engine damage and off-hire are usually the real loss, and frequently the excluded one.

Where Indian law governs, the Sale of Goods Act, 1930 supplies implied conditions of correspondence with description (s.15), merchantable quality (s.16(2)) and fitness for a disclosed purpose (s.16(1)). Section 62 permits these to be negatived by express agreement, and supplier terms invariably try. The sharper point is acceptance. Continuing to burn fuel after a defect is suspected may amount to acceptance under s.42, after which s.13(2) confines the buyer to a claim for breach of warranty. Stopping consumption is therefore a legal step as much as an operational one: it preserves the right to reject, the evidence and the mitigation case under s.73 of the Contract Act.

On time bars, Indian law diverges from English law. A clause that extinguishes a party’s rights on the expiry of a specified period is void, to that extent, under s.28(b) of the Contract Act. Suppliers’ terms seek to avoid this by framing a short notice window as a condition precedent to the accrual of any claim. That framing is unlikely to survive: the Supreme Court has applied s.28 to strike down a one-month claim-lodging condition, and the section looks to effect, not form. None of this assists where English law governs, as it does most traders’ terms; and a buyer who relies on s.28 to excuse late notice may find the samples already discarded. Absent a valid contractual bar, a claim for breach of contract carries three years under Article 55 of the Limitation Act, 1963, applied to arbitration by s.43 of the Arbitration and Conciliation Act, 1996.

Proof: the sample is the case

The dispositive evidence is the sample drawn by continuous drip at the point of custody transfer, sealed jointly and recorded on the bunker delivery note. Supplier terms frequently fix that point at the barge manifold and make the supplier’s retained sample conclusive. The MARPOL sample, drawn at the receiving ship’s manifold and retained for at least twelve months under Regulation 18 of Annex VI, exists for regulatory verification, and many terms exclude it from commercial testing. Tank samples drawn after a problem surfaces are commingled. They go to causation, not to the specification of what was delivered. The case is therefore often won or lost at the manifold: witnessing, seal numbers entered on the delivery note, and a protest where witnessing was refused.

Testing follows the methods referenced in ISO 8217, but the decisive standard is ISO 4259. A result that exceeds the limit by less than the reproducibility margin does not establish non-conformity with the requisite confidence, and most technical disputes turn on exactly that margin. Off-specification fuel on a listed parameter must also be distinguished from contamination. Catalytic fines are a listed parameter (aluminium plus silicon), not a contaminant. True contamination is pleaded under the standard’s general requirement that fuel be free of material, including chemical waste, that renders it unacceptable. That requires GC-MS screening and expert evidence linking the compounds found to the damage suffered.

Before a civil court, laboratory raw data, correspondence and photographs are electronic records requiring a certificate under s.63 of the Bharatiya Sakshya Adhiniyam, 2023.

Security: the limits of arrest

Under s.5(1)(a) of the Admiralty (Jurisdiction and Settlement of Maritime Claims) Act, 2017, a vessel may be arrested where the person who owned it when the claim arose is liable for the claim and still owns it at arrest. For a buyer suing a supplier, the receiving vessel offers no target: it belongs to the claimant, or to an owner who is not the party liable. Traders typically own no tonnage. That leaves the physical supplier’s barge, if the supplier owns it. But s.4(1)(l) frames the bunker head around supplies “to the vessel”, meaning the receiving ship, so the claim does not arise in respect of the barge. Substitute arrest under s.5(2) is expressly “subject to” s.5(1). A buyer would have to bring the claim within a head arising from the barge itself, such as loss or damage caused by the operation of a vessel under s.4(1)(d). That is an argument, not an established route, and a strained one where the complaint is the fuel rather than the barge’s operation.

Realistic security against a supplier therefore lies elsewhere. The options are interim measures under s.9 of the 1996 Act, including securing the amount in dispute, or attachment before judgment under Order XXXVIII Rule 5 CPC, whose threshold is high. A claim in court is a commercial dispute under the Commercial Courts Act, 2015. Pre-institution mediation under s.12A is excused only where urgent interim relief is genuinely contemplated.

In practice, the arrest in an Indian bunker dispute typically runs the other way: the supplier arrests the receiving vessel for the unpaid price under s.4(1)(l). Bunker claims carry no maritime lien under s.9(1), so the supplier must establish the owner’s personal liability. Where the charterer ordered the stem, consumption of the fuel does not make the owner liable. Terms purporting to bind “the vessel and her owners” do not, without more, make the owner a contracting party, and the Supreme Court has refused arrest of a vessel for the debts of her charterer. Where the owner is itself the buyer, its quality complaint becomes a defence and counterclaim; where the charterer bought the stem, the owner’s answer is that it is not liable at all. Section 11 allows the court to require the arresting party’s unconditional undertaking to pay for loss caused by wrongful or unjustified arrest, or by excessive security.

Arbitration and interim relief

Most traders’ terms provide for English law and arbitration in London or Singapore. Section 9 of the 1996 Act remains available in support of a foreign-seated arbitration, through the proviso to s.2(2), unless the parties have excluded it. The usual conditions apply: arbitration must commence within ninety days of the order (s.9(2)), and once the tribunal is constituted the court will intervene only where s.17 relief would be inefficacious (s.9(3)).

Emergency arbitration needs care. For an India-seated arbitration, the Supreme Court has treated an emergency arbitrator’s order as an order under s.17(1), enforceable under s.17(2). A foreign-seated emergency order has no route to enforcement, because Part II enforces only awards; the applicant must go afresh under s.9.

An arbitration clause goes to the forum for the merits, not to the availability of security. A court seised of a suit in breach of the clause refers the parties under s.8 or s.45; it does not dismiss. Arrest for security and arbitration on the merits are complementary, not alternatives.

Insurance and the regulatory overlay

The owner’s recovery action is funded, if at all, by FD&D cover. Main engine damage falls to hull and machinery underwriters, subject to the deductible, who then pursue the supplier by subrogation. P&I is engaged only if pollution or third-party liability follows.

Fuel exceeding the MARPOL Annex VI sulphur limit carries regulatory consequences independent of the commercial claim and of any pollution. Since 15 March 2026 the domestic framework is the Merchant Shipping Act, 2025, which repealed the 1958 Act. Notice to the flag Administration and the next port State, and debunkering where required, generate costs that then form part of the claim against the supplier.

Conclusion

A bunker quality claim is decided long before the merits hearing. It turns on who contracted with whom, on whether the contractual sample shows non-conformity beyond the reproducibility margin, and on whether the buyer stopped burning the fuel in time to preserve both its evidence and its right to reject. On security, Indian admiralty jurisdiction is more often the supplier’s weapon than the buyer’s. A buyer who looks to s.9 rather than to a vessel it cannot lawfully arrest starts from the stronger position.

For specialist advice on this topic, contact Jimi John at CHAMBERS OF JIMI JOHN, ADVOCATES, a member of the Global Law Experts network.