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Maritime industry continues to grapple with cashew nut challenges in marine fuel blends

David Browbank, Fuel Chemist at Brookes Bell and scientific analyst, recently dived into the complexities of using CNSL in marine fuel blends and emphasised the need for more regular fuel testing.

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David Browbank, Fuel Chemist at global technical and scientific consultancy Brookes Bell and scientific analyst, recently dived into the complexities of using Cashew Nutshell Liquid (CNSL) in marine fuel blends.

He noted that inconsistent engine performance and varying CNSL grades point to the need for more comprehensive testing and better data to ensure safe and efficient operations:

As industry stakeholders look for quick and available ways of embracing more sustainable bunker fuel sources, driven by an urgent need to reduce carbon emissions and comply with stringent IMO regulations, many are turning to Cashew Nut Shell Liquid (CNSL) as a biofuel blend option. 

Despite its growing popularity, ongoing trials continue to reveal that integrating CNSL into marine fuels as a blend component may pose operational challenges that could potentially disrupt vessel performance. 

However, due to its plentiful supply, green credentials, and the requirement to achieve short-term emission gains, many are overlooking the potential long-term operational risks associated with CSNL.

David Browbank Fuel Chemist Brookes Bell

Since CNSL comes from the cashew nut process, it is an easily accessible renewable resource.  Its extraction is efficient, and it has a smaller environmental footprint compared to traditional fossil fuels, making it a viable candidate for reducing carbon emissions.  Moreover, a robust cashew crop can ensure a plentiful and affordable supply for biofuel production,” said David Browbank, Fuel Chemist at Brookes Bell and a respected scientific analyst.   

Despite these benefits, the use of CNSL in marine fuel blends has not been without complications.  Early field reports indicate a host of operational issues that have raised concerns among maritime engineers and fuel chemists.  Many vessels using CNSL-enriched fuels have experienced problems such as fuel sludging, filter clogging, and deposits within the fuel system.  More alarmingly, there have been cases of corrosion affecting critical components like fuel pumps, injectors, and turbocharger nozzle rings.  These issues have led to increased maintenance requirements and unplanned operational disruptions for ship owners globally.

David noted that these issues are primarily due to CNSL still being in early development. 

There’s limited research on using CNSL directly as a bunker fuel blend.  We’ve seen that some engines struggle with the raw blend, while one trial using a highly refined CNSL mix with a large proportion of Marine Gas Oil (MGO) produced good results.  However, performance varied greatly between engines, suggesting that differences in CNSL concentration or quality in various blends could affect outcomes.  Ship operators should be cautious given these potential issues,” he added.

He further emphasised the inherent uncertainties when working with new fuel blends.  “Every fuel possesses its own unique chemical signature, so predicting how each blend will interact within different engine systems remains challenging.  This is precisely why expertise from fuel chemists, marine engineers, and metallurgists is indispensable.  The current uncertainty around CNSL, along with other novel biofuel components, is posing significant hurdles for vessels trying to meet environmental standards.”

The existing fuel standards are further complicating the situation.  The latest edition of ISO 8217 permits the use of biofuel blends, but these are generally limited to Fatty Acid Methyl Ester (FAME) blends, which have clearly defined characteristics and performance limits.  CNSL, in its current form, falls outside these established parameters.  As a result, its adoption without rigorous and standardised testing protocols could lead to an increased number of disputes over fuel quality and performance between ship owners and fuel suppliers. 

Maritime operators are facing a dual challenge: balancing the environmental benefits of renewable fuels with the practical realities of fuel performance and engine safety.  While CNSL offers a pathway to reducing carbon emissions, the operational risks—such as increased maintenance costs and potential engine damage—need greater consideration.  The situation calls for comprehensive research and extensive field trials to establish reliable data on CNSL’s performance under various operating conditions.

David noted that Brookes Bell has seen an increase in the number of CNSL-related cases it handles.  As a result, the company’s team of fuel scientists have had to deepen their understanding of the commercial and operational risks associated with cashew nuts as a biofuel blend.

 “Our team is really putting in the effort to understand how CNSL reacts in different fuel blends.  By understanding the chemical fingerprint of CNSL and how it interacts with different fuel blends and engine configurations, we aim to build a robust data foundation that not only confirms its potential but also guides safe adoption.  This isn’t just about CNSL – it’s about creating a solid groundwork for new biofuels we might use, so we can meet environmental goals without risking engine performance.”

Looking ahead, industry stakeholders understand that a cautious and methodical approach is essential for CNSL use in bunker fuels.  The increasing availability of biofuel blends will require ship owners to invest in regular fuel testing and quality assurance measures.  Enhanced collaboration among fuel suppliers, researchers, and maritime operators will also be vital to ensuring that renewable fuels can be integrated into the global shipping fleet without compromising operational reliability.

Whilst CNSL represents a promising step toward a more sustainable maritime industry, its integration into marine fuel blends is fraught with challenges.  The initial setbacks, ranging from fuel system blockages to component corrosion, highlight the importance of rigorous testing and the development of standardised fuel quality parameters.  As the industry continues to pursue renewable alternatives, the path forward may be complex, but the lessons learned from CNSL trials will be instrumental in guiding future innovations. 

 

Photo credit: Brookes Bell
Published: 6 May, 2025

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LR: “Whitchampion” becomes first bunker tanker certified to load, carry and blend FAME B100 onboard

Second Whitaker tanker, Whitchallenger, will be undergoing a similar approval process and is expected to be certified later this year.

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Classification society Lloyd’s Register (LR) on Thursday (12 June) claim UK-based bunker operator John H. Whitaker (Tankers) Limited’s bunker tanker Whitchampion has become the first in the industry to load, carry and blend Fatty Acid Methyl Esters (FAME B100) onboard under IBC Code and MARPOL Annex II regulations.

The development occurred after LR issued a chemical certification to allow Whitchampion to perform onboard blending of biofuels with petroleum distillates and residual fuel oils. The operation is authorised within UK coastal waters under a Tri-Partite Agreement between the Isle of Man Flag and the UK Maritime and Coastguard Agency (UKMCA).

A second Whitaker tanker, Whitchallenger, will be undergoing a similar approval process and is expected to be certified later this year.

At present, bunker tankers certified under MARPOL Annex I are limited to carrying blends no more than 30% FAME under IMO regulations. Oil Fuels with higher bio-content fall under International Bulk Chemical Code (IBC Code) and MARPOL Annex II, typically requiring full chemical tanker status. That regulation has, in effect, frozen out a significant portion of the conventional bunker tanker fleet from supporting mid-to-high-range biofuel blending.

Whitaker’s Whitchampion is the first LR-classed vessel to bridge that gap. Through comprehensive Gap Analysis and Risk Assessment against the IBC Code and MARPOL Annex II requirements, LR developed an approach which involved mitigation of the assessed risks. This led to obtaining waivers/exemptions from the Flag Administration allowing this Annex I bunker tanker to gain chemical certification to carry FAME as cargo, without needing to convert to full chemical tanker status.

The successful delivery of dedicated onboard training on the safe handling of FAME has also led to UKMCA approval and a FAME Restricted endorsement to the existing Oil Tanker Dangerous Cargo Endorsement (DCE) for the crew.

Tim Wilson, Principal Specialist Fuels and Emissions, LR, said: “This certification demonstrates a credible and commercially viable route for existing bunker tankers to participate in the energy transition. It sets a clear blueprint for others to follow, enabling owners to consider the possibility of adapting existing bunker tankers for sustainable fuel delivery without resorting to prohibitively expensive conversions or replacement with a chemical tanker.”

Peter Howard, Technical Director at Whitaker Tankers, added: “This certification is the result of focused determination from all involved and underlines Whitaker’s commitment to providing clients with the flexibility they need to meet their decarbonisation goals. We’re proud to lead the way in this space with Whitchampion and look forward to progressing a similar certification with LR for her sister ship Whitchallenger later this year.”

 

Photo credit: Lloyd’s Register
Published: 13 June 2025

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GCMD-BCG survey: 77% of shipowners, operators view net zero as high strategic priority

Survey also found the use of bio-blended bunker fuels has more than doubled to 46% and methanol use has increased from 3% to 6% but uptake of more nascent technologies such as ammonia remains limited.

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GCMD-BCG survey: 77% of shipowners, operators view net zero as high strategic priority

The Global Centre for Maritime Decarbonisation (GCMD) on Wednesday (11 June) said a survey found 77% of shipowners and operators now consider achieving net zero a high priority in their strategy, up from 73% two years ago.

This was among the findings of the second edition of the Global Maritime Decarbonisation Survey, jointly conducted by GCMD and Boston Consulting Group (BCG) between October 2024 and February 2025.

The survey gathered 114 responses from shipowners and operators across a range of vessel types, fleet sizes, and regions. While the survey was conducted before the International Maritime Organization’s (IMO) MEPC 83 session in April, its findings already reflected sustained commitment across the industry. The outcomes of MEPC 83—introducing new regulatory targets and incentives—are expected to reinforce these ambitions and further accelerate momentum.

Survey results show that 60% of respondents have now set net-zero targets (up from 54%), while the use of bio-blended fuels has more than doubled to 46%, and methanol use has increased from 3% to 6%. However, uptake of more nascent technologies—such as ammonia, wind-assisted propulsion systems, solar panels, super-light ships, and air lubrication—remains limited.

The survey also reflects the industry’s desire for policies and regulations to create a level playing field. Nearly three-quarters of respondents identified either compliance measures or financial incentives as the most important policy objectives. A level playing field will ensure that early adopters are not competitively disadvantaged on cost and stakeholders with limited resources can benefit from financial support to overcome economic barriers.

The survey also gathered insights from key bunkering ports, whose support is critical for maritime decarbonisation. Most surveyed ports have roadmaps and dedicated teams focused on initiatives to facilitate maritime decarbonisation, and all of them, namely Port of Antwerp-Bruges, Port of Long Beach, Port of New York and New Jersey, Port of Rotterdam, and Port of Singapore, offer green incentives. 

A significant concern for ports, however, is the lack of demand certainty from shipping companies for both low-carbon fuels and Onboard Carbon Capture Systems (OCCS). This ‘chicken-and-egg’ dilemma hinders ports to take on the investment decision to develop the requisite infrastructure, though the recently introduced GHG pricing mechanism is expected to strengthen demand signals for low-carbon fuels.

Dr Sanjay C Kuttan, Chief Strategy Officer of GCMD, said, “Positive developments in maritime policy, especially from the IMO, which further tighten limits on GHG emissions, along with the increased ambitions voiced by survey respondents, are encouraging signals. Greater cooperation with the ports and pertinent stakeholders across the various value chains will be required to address challenges across the broader ecosystem. With the right investments and collaborative actions, the maritime industry can chart a course to a future where sustainable decarbonisation and commercial success can co-exist.

Anand Veeraraghavan, Managing Director and Senior Partner of BCG, said, “It is encouraging to see that even in the face of global uncertainties, the maritime industry’s decarbonisation ambitions remain intact and steadfast. The recent MEPC outcomes mark a pivotal step forward, sharpening demand signals with incentives for exceeding compliance goals and penalty mechanisms for shortfalls. Now is the time for the industry—both ships and ports—to build on this momentum.

Note: The second edition of the GCMD–BCG Global Maritime Decarbonisation Survey report can be viewed here

 

Photo credit: Lukas Blazek on Unsplash
Published: 12 June, 2025

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Biofuel

Argus Media: EU–IMO overlap could incentivise biofuel demand

EU and IMO dual efforts to cut shipping emissions could lead to stacked fines and higher fuel costs for ships visiting EU ports, but it could also sharpen incentives to use biodiesel blends.

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The EU and the International Maritime Organization’s (IMO) dual efforts to cut shipping emissions could lead to stacked fines and higher fuel costs for ships visiting EU ports, but it could also sharpen incentives to use biodiesel blends.

11 June 2025

The EU’s FuelEU Maritime and emissions trading system (ETS) is already in force within EU territory, while the IMO’s global greenhouse gas (GHG) penalty system takes effect in 2028 and applies to EU waters, among other regions. Without coordination, ships operating in and out of EU waters that exceed both sets of limits could pay under both systems.

FuelEU targets vessel pools, while IMO rules will be applied on an individual vessel basis. Both cover lifecycle GHG emissions, but IMO’s thresholds are stricter (see chart). FuelEU penalties are currently €2,400/t of VLSFO energy equivalent ($2,708/t in May). From 2028, IMO penalties will range from $100/t CO₂ e for breaching the direct GHG limit to $380/t for surpassing the base threshold. On top of this, the EU ETS will require shipowners to pay for 100pc of CO₂ emissions from combustion in EU waters starting in 2026.

In May 2025, Rotterdam high-sulphur fuel oil (HSFO) averaged $415/t and ETS carbon credits averaged $79/t. Since VLSFO emits 3.114t of CO₂ per tonne burned, ETS alone would add $246/t for 100pc CO₂ charge. If a vessel also breaches FuelEU and IMO limits, it would face another $71/t and $82/t, respectively, bringing the total penalty burden to $399/t and the effective HSFO price to $814/t in 2028 (see chart). A comparable ship operating only in Asia would pay $497/t, factoring in IMO penalties alone.

In May,northwest Europe B30 biodiesel — a used cooking oil methyl ester and very low-sulphur fuel oil blend — averaged $790/t. Considering a $173/t CO₂ EU ETS emissions cost that covers 100pc of emissions from combustion, and $25/t IMO overcompliance credit in 2028, the B30 price would be $938/t, a premium to HSFO. But by 2030, the combined effect of IMO and EU penalties plus overcompliance credits would flip B30 to a discount for EU-bound ships. Outside EU waters, IMO alone would not tip the balance.

The overlapping rules are likely to prompt shipowners to concentrate low-carbon fuel use in EU waters, shifting the bulk of global shipping emissions reductions to the North Sea, Baltic Sea, Mediterranean, and northeast Atlantic, leaving the Pacific, Indian, Arctic, and western Atlantic regions with less progress.

“The [European] Commission will assess the new global measure to see how it interacts with current EU maritime-related regulations, maintaining environmental integrity while avoiding significant double burden”, it said in a statement in April. The EU has two and a half years until 2028 to make a decision.

By Stefka Wechsler

Argus Media: EU–IMO overlap could incentivise biofuel demand

FuelEU and IMO well-to-wake GHG Intensity gCO2e/MJ

Argus Media: EU–IMO overlap could incentivise biofuel demand

NW Europe bunkers with IMO and EU penalties $/t

 

Photo credit and source: Argus Media
Published: 11 June, 2025

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