The International Bunkering Industry Association (IBIA) will be hosting its flagship Annual Convention in Hong Kong at the Hong Kong Convention Exhibition & Convention Centre between 18 to 20 November 2025, as part of Hong Kong Maritime Week.
Captain Rahul Choudhuri, IBIA Board Member & IBIA Asia Regional Board Chair, and President of Strategic Partnerships at VPS, sat down with bunkering publication Manifold Times to offer his take on future challenges of the marine fuels sector.
MT: Heading into IMO 2030, what are the challenges of maintaining bunker fuel quality for safety despite an increasing array of alternative marine fuels? Is the ISO 8217 marine fuel standard enough for end users?
The shipping industry, with 20% of users still on the outdated & withdrawn ISO 8217:2005 edition, is certainly ‘change-averse’. Bunker buyers want a cheaper product [e.g. ISO 8217:2005] but they also need to be aware this is a poorer quality product line.
This slow adoption means the benefits of the new and much improved ISO 8217:2024, which also addresses biofuels for the first time, are not being realised. It’s like a dilemma and a curse and if every new version of an ISO 8217 standard, which is supposed to improve quality and safety, is not really going to be used ultimately the shipping industry will have to pay the price.
And the worst nightmare is when the ship faces engine damage, loses propulsion, stops in midocean and is drifting for several days. This is still happening today and poses a very high safety of life risk.
Another part of ISO 8217 development is that because of the way it is conducted, there are many countries representation involved with necessary compromises when the standard is finally completed.
For example, the latest ISO 8217:2024 standard does not consider biofuel issues such as microbial activity, cold flow, stability, chemical contamination etc.
In contrast, the new Biofuels Standard in Singapore TR140 launched early this year is more comprehensive & covers Biofuels quality more holistically, including future new feedstocks.
To address risks not covered by standard tests, VPS launched the Additional Protection Service for Biofuels testing(APS-BIO) three years ago. This service provides additional protection by testing for a wider range of issues in biofuels, aiming to provide a comprehensive quality control of biofuels that are used for shipping.
MT: Have marine fuel testing labs been able to catch up with risk management of bunker consumption in relation to the evolution of changing bio feedstocks?
Acknowledging the slow adoption of latest ISO 8217 marine fuel standards, VPS has developed a risk management plan for shipowners consuming biofuel bunkers by testing for additional parameters covering Energy Content, Renewable Content, Stability, Cold-Flow Properties, Corrosivity, Microbial Activity & Chemical Contamination. This is part of the APS-BIO package mentioned earlier.
There’s a lot of work that VPS has done in understanding new types of bio feed stock. For example, Cashew Nut Shell Liquid (CNSL) is now a ‘hot topic’ in certain regions, and we know this is a sustainable feedstock which in principle can benefit the circular economy.
Based on our experience, some CNSL blends have been used without any issues while others have caused engine damage problems, like fuel sludging, injector failure, filter clogging, etc.
So, there is a need for risk management here in how you use such biofuels. What is important is to take proactive measures and do the necessary tests including by blending them into small portions while submitting samples to the lab. More advanced tests like the Fuel Combustion Analyser can be a useful tool as well.
Interestingly, certain blends of CNSL show better ignition & combustion characteristics when blended with Marine Gas Oil (MGO) and Very Low Sulphur Fuel Oil (VLSFO) when compared to Heavy Fuel Oil (HFO). This is an example of the benefit by employing risk management and understanding the types of biofuels consumed.
MT: Has the role and challenges of the bunker surveyor changed in the era of MFM, digitalisation and zero carbon/green fuels?
When we look at bunker survey, it is essentially a subset of marine surveying that has been there since the advent of shipping. The primary role of a surveyor is really based on ‘trust but verify’ and that concept is what the surveyor is doing whether it is in bunkering or marine surveying or cargo inspection – so that is here to stay.
But in the context of MFM, the role is changing and for example the surveyor needs to now ensure compliance to ISO 22192 [Bunkering of marine fuel using the Coriolis MFM system] so there is a technologist direction that surveyors need to adopt as well.
The role of the bunker surveyor will be even more important with future alternative marine fuels (such as Methanol) where the level of safety is higher. The types of measurement & sampling are different so in a way the surveyor is moving up the value chain and that must be managed in the industry with proper training etc., and I think those that succeed will be at the forefront of future surveying.
For example, about two years ago there was a methanol bunker delivery in Singapore. VPS was appointed by not only the shipowner but also the product owner. One must be aware that when you do complex fuels like methanol, other parties who operate on a different mindset want to be involved and are interested in this type of product surveying control.
MT: Moving forward, can you forecast the changing role of bunker fuel testing labs past (pre-IMO 2020) and present leading into IMO 2030?
There are several formal studies done which shows the best-case scenario up to 2050 still includes about 50% fossil fuel for global consumption with the rest being taken up with renewable and green fuels. That’s the best case.
I think fossil fuels are here to stay for some time and managing these will continue to be key work for laboratories and testing agencies. Issues such as high Al+Si (Catfines) are not only going away but increasing, and this means better operational control of purification systems onboard vessels.
From a lab point of view, future fuels offer an opportunity to value add at a different level as they are a much more complex and high-end type of products. Those laboratories who are willing to invest and take up positions in these new future marine fuels really will be the winners of tomorrow.
Note: Captain Choudhuri is amongst panellists featured in ‘Session seven: Fuel of the Future and Forward Thinking: Gearing Up for a Sustainable and Skilled Maritime Industry’ at the IBIA Annual Convention 2025.
Join the Conversation
With over 300 delegates expected, the IBIA Annual Convention 2025 is set to be a defining moment for the marine fuels industry. Registration is now open via the IBIA Annual Convention website.
Photo credit: Manifold Times
Published: 8 October 2025