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Off specification bunkers: Legal issues arising from the supply of fuel containing chlorinated hydrocarbons in Singapore

Paul Collier, Senior Associate at global law firm Clyde & Co, offers advice to shipowners suspecting off-specification bunker fuel may have been supplied to their vessel.

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The following article ‘Legal issues arising from the supply of fuel containing chlorinated hydrocarbons in Singapore’ has been written by Paul Collier, Senior Associate at global law firm Clyde & Co:

There have been a number of cases of chlorinated hydrocarbons being detected in recent bunker deliveries in Singapore, and reports of vessels suffering from fuel system failures, resulting in loss of power and propulsion in main and auxiliary engines.

Whilst initial test results indicated that the fuel supplied met ISO 8217 table 2 specifications, advanced Gas Chromatography-Mass Spectrometry head space (GC/MS) testing by VPS identified the presence of a number of contaminants, including dichloroethane, trichloroethane, trichloromethane, tetrachloroethylene and chloro-benzene in fuel supplies. These contaminants could potentially cause wear and seizure of fuel pumps, fuel valve problems and corrosion, and in serious cases could cause engine blackouts.

The difficulty for vessel owners, time charterers and bunker traders is that fuel may have been supplied to vessels that has been identified as complying the ISO 8217 table 2 specifications but contains latent contaminants which can only be detected through advanced GC/MS testing. The risk is similar to that faced with the “Houston problem” cases of 2018, in that vessels may consume contaminated fuel, and suffer engine damage before it becomes apparent that the fuel is in fact contaminated and unsafe to consume.

There are a number of issues which are worth considering at the outset if it is suspected that off-specification fuel may have been supplied to a vessel.

Sampling

The samples taken at the time of the bunker supply are of critical importance; testing of these samples can indicate whether the fuel supplied is off-specification, or alternatively if is safe to consume. The samples taken are also likely to be key to the outcome of any future dispute.

Given that current reports suggest that the alleged contaminants can only be identified through advanced testing, if possible, it is advisable for GC/MS testing to be undertaken before fuel is consumed, and for parties not to solely rely on initial ISO 8217 table 2 tests only. In the meantime, it is also likely to be advisable to keep any fuel which could potentially be contaminated segregated, in order so it can be isolated and, if necessary in the future, debunkered.

Fuel quality

Whilst initial fuel tests may indicate that fuel complies with ISO 8217 table 2 standards, latent contaminants may nonetheless render the fuel off-specification. In this regard, buyers may be able to argue that the supply breaches the requirements of clause 5 of ISO 8217 which provides “fuel shall be free from any material that renders the fuel unacceptable for use in marine applications” and/or Regulation 18.3 of MARPOL Annex VI which provides “the fuel oil shall not include any substance or chemical waste which … jeopardises the safety of ships or adversely affects the performance of machinery”.

In the context of time charters, owners may also be able to argue that time charterers are under an obligation to supply fuel that is of reasonable general quality and suitable for the type of engines on the vessel.

Time bars

Bunker supply contracts often impose an obligation on buyers to notify any quality claims within a fixed number of days from the date of supply. This timeframe ranges, generally between 7 days and 30 days, and contracts generally include wording providing that if quality claims are not notified within this period, claims are waived or barred.

Where latent contaminants are present in fuel, and fuel quality problems have only materialised after a short contractual time bar has expired, buyers may seek to argue the time bar ought not to be enforceable. For example, buyers may seek to argue that they could not have reasonably been expected to notify the quality claim within the time bar period, and the time bar should not therefore be enforced. However, on a practical perspective, it is likely to be beneficial for buyers to seek to establish whether or not fuel is off specification as soon as possible after the fuel is delivered, to seek to avoid any potential arguments from suppliers alleging that claims are barred following the expiry of a contractual time bar.

Mitigation and evidence gathering

A. Claims for engine damage

Where off-specification fuel has been supplied to a vessel and there is engine damage, to successfully claim against the bunker supplier, in addition to proving the fuel supplied was off specification, the buyer will also need to be able to show the fuel supplied caused the engine damage.

On the face of it, this might appear simple to establish, but parties should be mindful that bunker suppliers or time charterers may seek to argue that (i) a previous bunker stem caused the engine damage (ii) the engine was not maintained properly, and/or (iii) there was poor fuel management (such as the mixing of incompatible fuels) and this caused the damage.

If such arguments are raised, the outcome of any dispute will largely depend on the quality of the available evidence. As a result, if engine damage is alleged to be the consequence of the supply of contaminated bunkers, it is advisable that evidence is gathered at an early stage. This includes instructing surveyors to inspect the engine, taking fuel samples and retaining documentary records (including log books, oil record books and maintenance records).

B. Where fuel has not been consumed

Where fuel has tested as off-specification but has not yet been consumed, then there is likely to be a question as to whether the fuel should be debunkered, or whether steps can be taken to allow the fuel to be safely burned. This is primarily a technical question for fuel / engine experts.

Both options expose the vessel owners to risk. If the fuel is consumed, then owners may run the risk of engine damage, as well as facing a possible argument that in burning the fuel, they failed to mitigate their losses. On the other hand, if fuel is debunkered, then owners may face an argument that the fuel should have been consumed, providing it was safe to do so.

Given the risks, it is highly advisable that vessel owners rely on expert advice and act in a cautious and prudent manner. It may also be worthwhile owners requesting their supplier or time charterer arrange the debunkering of off-specification fuel, even though such a request may not be agreed, as it will likely assist in showing that owners sought to mitigate their losses.

 

Paul Collier
Senior Associate, Clyde & Co Clasis Singapore Pte. Ltd.
Direct Dial: +65 6544 6569
Email: [email protected]

 

Photo credit: Manifold Times
Published: 5 April, 2022

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Biofuel

BHP and GCMD trial multi-feedstock B100 bio bunker fuel on bulk carrier

Bio-blend in the BHP and GCMD pilot is being used on a BHP-chartered bulk carrier “Berge Lyngor”, which was bunkered in Singapore in early May.

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BHP and GCMD trial multi-feedstock B100 bio bunker fuel on bulk carrier

BHP and the Global Centre for Maritime Decarbonisation (GCMD) on Wednesday (3 June) said they have blended biofuels from two distinct feedstocks—used cooking oil and waste animal fats —and introduced the lower-emissions marine fuel into a BHP-chartered bulk carrier as part of a pilot project.

The bio-blend in the BHP and GCMD pilot is being used on a BHP-chartered bulk carrier Berge Lyngor, owned and operated by Berge Bulk, transporting BHP iron ore from Western Australia to China. When run on bio-blend, the vessel has the potential to reduce well-to-wake greenhouse gas emissions by approximately 79 per cent per voyage compared to sailing on very low sulphur fuel oil (VLSFO).

The vessel bunkered in Singapore in early May with a B100 bio-blend comprising 50 percent tallow-derived biodiesel, sourced and supplied by HAMR Energy, and 50 per cent used cooking oil (UCOME) supplied by Mitsui & Co Energy Trading Singapore (METS).

Mitsui also blended the fuel and Dan-Bunkering coordinated and executed the bunkering operation, which was performed by Global Energy’s barge MT Maple.

The BHP and GCMD pilot will assess how biofuels from multiple feedstocks can be blended, handled, and introduced under real-world operating conditions using existing used cooking oil bunkering infrastructure.

At the same time, insights from this pilot will help identify solutions to challenges related to fuel quality, handling, traceability, and onboard vessel performance.

Biofuels for global shipping today rely heavily on used cooking oil – a feedstock whose availability is approaching its projected limits. Biofuel from waste animal fats presents a promising option to expand the supply of lower-emissions marine fuels.

The outcomes of the pilot are expected to shed light on the practical steps to integrate biofuel blends from different feedstocks into existing supply chains. The diversity of biofuels will provide shipowners and operators with greater flexibility to optimise fuel procurement based on cost, availability, and lifecycle emissions performance.

Biofuels derived from different feedstocks can exhibit varying properties that may impact operations, including potential corrosion from oxidation, fuel system clogging caused by wax formation, which this pilot aims to assess.

The pilot will trace and verify the biofuel blend’s integrity aimed at bolstering confidence in emissions reductions reporting. The pilot will also provide insights into how robust tracing can support future marine fuel supply chains where biofuels from multiple feedstocks with varying lifecycle greenhouse gas emissions footprints are blended together.

This project is co-funded by the Maritime and Port Authority of Singapore under the Maritime Innovation and Technology Fund (MINT).

 

Photo credit: Global Centre for Maritime Decarbonisation
Published: 3 June, 2026

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Biofuel

NYK starts one-year B100 bio bunker fuel trial on car carrier

In this trial, NYK will operate a car carrier continuously on B100 for one year to evaluate the impact on engines, fuel supply systems, and operational practices.

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NYK starts one-year B100 bio bunker fuel trial on car carrier

Japanese shipping firm NYK on Tuesday (2 June) said it has commenced a one-year long-term trial involving the continuous use of 100% biofuel (B100) on an NYK-operated car carrier. 

In this trial, NYK will operate a car carrier continuously on B100 for one year to evaluate the impact on engines, fuel supply systems, and operational practices. High-purity biofuels such as B100 are known to be susceptible to degradation from oxygen, light, and heat, raising concerns about the stability of such fuels during long-term use.

In this trial, the biofuel primarily comprises FAME (Fatty Acid Methyl Ester) derived from used cooking oil and similar feedstocks.

The initiative is designed to evaluate the fuel’s effects on the vessel’s equipment and verify operational safety under real-world conditions. 

Through this effort, NYK seeks to accumulate technical expertise that will support the broader use of high-purity biofuels and further accelerate efforts to reduce greenhouse gas (GHG) emissions.

NYK has been advancing the use of biofuels through various initiatives. In 2024, the company conducted a trial using biofuel blend B24 and subsequently expanded practical usage to B30. However, the company said there remains limited global experience with the long-term continuous use of B100.

“By collecting long-term operational data through this trial, NYK aims to accumulate valuable technical insights to support both the safe operation of vessels and the wider adoption of high-purity biofuels,” it said. 

 

Photo credit: NYK
Published: 3 June, 2026

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Ammonia

AM Green plans to build green ammonia plant at Indian port

Initiative also includes development of green ammonia handling, storage and bunkering infrastructure, pilot bunkering operations, safety procedures and training programmes, says VOC Port Authority.

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VO Chidambaranar (VOC) Port Authority on Friday (29 May) said it has signed a Memorandum of Understanding (MoU) with India’s ammonia producer AM Green Ammonia to collaborate in the development of a green ammonia production plant.

The plant will have a capacity of one million tonnes per annum (MTPA) at Tuticorin.

The initiative also includes development of green ammonia handling, storage and bunkering infrastructure, pilot bunkering operations, safety procedures and training programmes. 

The project is expected to support the development of green fuel corridors connecting VOC Port with major ports in Europe and Asia, thereby strengthening India’s position in the global green fuels value chain.

VOC Port also signed a Memorandum of Understanding (MoU) with Bureau Veritas (India) Pvt. Ltd., to collaborate on Green Port certification, emissions accounting, ESG reporting, safety validation, development of green bunkering practices, and establishment of a Centre of Excellence for green fuels and sustainability.

The port also plans for an upcoming 750 m³ green methanol bunkering facility.

 

Photo credit: Naveed Ahmed on Unsplash
Published: 3 June, 2026

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