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Mass Flow Metering Systems: Dispelling the myths, detailing the benefits

MFMS shown to have delivered clear benefits in the face of measures taken in response to the pandemic, according to ExxonMobil and Bunkerspot research.

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This paper reviews the use of mass flow metering systems (MFMS) and dispels some of the myths surrounding their benefits and operations.

The use of mass flow metering systems (MFMS) is mandated by the Singapore marine port authority because of their ability to enhance the integrity and security of the bunkering process. They are also in widespread use in Hong Kong, the Amsterdam-Rotterdam-Antwerp (ARA) ports and in France, amongst other bunkering locations, but despite their growing adoption there remains some confusion about their benefits, such as the role they play in minimising bunker disputes.

These are just some of the findings revealed by new marine industry research, carried out by ExxonMobil and Bunkerspot, which asked maritime professionals from around the globe about their perception of the technology. Interestingly, MFMS were shown to have delivered clear benefits in the face of the measures taken in response to the pandemic.

Armelle Breneol
Marine Fuels Technical Advisor
ExxonMobil

 

A quick dip into the basics

In line with the marine fuels industry’s practice of predominantly selling fuels by mass, not volume, a MFMS directly measures fuel mass, removing the need for complex conversions using traditional measurement methods. It operates on the principles of the Coriolis Effect, which refers to the deflection of moving objects when viewed in a rotating reference frame. In the meter, fluid passes through two u-shaped tubes, which twist as a result of the flow. The angle of deflection from the vibration plane is used to establish flow calibrations.

A major advantage of the system is that the three variables in the refuelling process are independently monitored – direct mass flow, density and temperature. For example, monitoring density can help pick up air in the line. This could create air bubbles and affect measurement readings that traditional methods, such as manual dipping, can sometimes miss.

A mass flow meter, which has no mechanical moving parts, can be used for more than six years in the marine environment with minimal maintenance cost. In Singapore, some meters have actually been in use for eight to nine years. However, based on a conservative six-year usage, the cost per tonne can be as low as USD$0.17 per metric tonne when using a well-maintained MFMS, over and above any other tangible benefits.

To ensure integrity and security across the entire refuelling process, a MFMS should be independently accredited. This should cover information systems, equipment sealing and independent system audits by port authorities or third parties.

The proven benefits

This provides a wide range of benefits to vessel operators, marine industry suppliers and regulatory bodies. These include:

  • Enhanced transparency – reducing the uncertainties associated with density, temperature and other factors such as tank geometry. A MFMS is accurate to within +/- 0.5%
  • Significant cost benefits – saving up to an estimated US $4,650* per fuel delivery by eliminating the possibility of human calculation errors from traditional tank dipping
  • Significant time savings – offering the potential to save up to three hours per delivery**
  • Enhanced system integrity – with independent certification of the calibration and security of the system’s associated pipelines, valves, gauges and barge equipment. Tamper-evident seals are also installed throughout
  • Increased traceability – with data logged throughout the entire delivery process, illustrating the fuel mass transferred at any point in time, offering a transparent and accurate measure of delivered fuel

Taking a sounding

In order to better understand the marine industry’s grasp of the technology, ExxonMobil invited a range of maritime professionals to reflect on their experience and opinions around the use of MFMS. Replies were received from across Europe, Africa and South America; respondents represented charterers, vessel owners, bunker suppliers and surveyors. The results were highly informative.

All but one respondent had experienced a bunker dispute of some sort – around 50% said they were common. The remainder of the sample said they happened but were infrequent. What was revealing were the perceptions of the cost of an average bunker dispute; estimates ranged from around US$1,000 up to US$50,000 per stem. When asked to list the ports where bunker disputes are most common ARA ports were named many times. Singapore, which mandates the use of MFMS, wasn’t mentioned once.

Stemming the losses

When discussing the percentage of bunker quantity issues that go unchallenged by vessel operators, 38% of the sample said at least half. The reasons given for this included a shortage of time, an absence of manpower, a lack of willingness amongst crews to challenge barge operators and an inability to gauge a bunker. “It is very difficult to get an accurate manual tank measurement onboard receiving vessels,” explained a bunker supplier from the sample group.

When asked if vessel operators were prepared to ignore bunker shortages if the price of the fuel from that supplier is significantly lower than others, the split was equal; 43% of respondents answered either ‘yes’ or ‘no’ with the remainder unsure. Where there was more agreement was over the best ways to settle a bunker dispute: investigate the issue and raise a claim against the fuel supplier was the preferred option, although it was pointed out by some respondents that hiring a surveyor was a valuable defence against shortfalls. “I always have a bunker quantity surveyor present during bunkerings. The surveyor settles all disputes, if any, on site,” said one ship owner.

Just 19% said they would inform the authorities (port administrators, police etc.) of a bunker quantity dispute. Significantly, all of the respondents saw the value in maintaining transparency during the bunkering process.

Keeping the meter running

Eighty-seven percent of the sample group had experience of bunkering using a MFMS, although the understanding of how they work ranged from ”basic” and “minimal” to “it’s an entire system that utilises the advantage of a MFM but it must be a closed system that eliminates the possibility of cheating”. Another suggested that “as long as the entire operation, device and parameters are certified, it reduces the risk of fraud”.

However, opinions of MFMS varied quite widely. One bunker supplier said: “They’re a good thing and other places should use them, not only Singapore.” A ship owner remained unconvinced by their veracity. “We still need to be careful in assessing the delivery operation on barge side. As such, the surveyor is playing his role and checking vessels before and after the delivery,” they explained. A surveyor based in Europe believed they “were good to have” as they provide greater transparency during the bunkering process but they are also “an escape for suppliers”.

Ending the disputes

The sample group was then asked if MFMS could make bunker quantity disputes a thing of the past – 40% said ‘yes’ while 27% said ‘no’; the remainder were ‘unsure’. Despite this, 87% said they would support the mandating of MFMS around the globe as has happened in Singapore. One of the respondents who didn’t support their wider use said: “In ARA ports, barges are already equipped with reliable systems.” The respondent was a surveyor based in ARA.

The final question concerned the role of MFMS during the pandemic as a result of the restrictions brought in to tackle the spread of the virus, such as contactless bunkering. An increase in quantity disputes was highlighted by 38% of the sample; a further 44% was unsure. Many of the respondents were therefore supportive of the use MFMS as “surveyors can’t always board the barge, it’s difficult for them to find missing quantities”.

This drawback was confirmed by other replies. “The problem is that surveyors cannot board the bunkering barge to verify soundings,” said a South American ship owner. And according to Netherlands-based surveyor: “Barge operators don’t allow surveyors onboard, not even with the correct papers or negative Covid test.”

Lobbying for mass acceptance

Clearly, there’s an appetite for the greater use of MFMS even if there are still some gaps in the understanding of the core technology. ExxonMobil supports the use third-party accredited MFMS and will continue to implement the technology on its barges, where feasible, to ensure customers receive an efficient and transparent bunkering service without compromising on safety.

To find out more about ExxonMobil’s award winning MFMS visit: https://www.exxonmobil.com/en/marine/technicalresource/marine-resources/marine-fuels-mass-flow-metering-system

*Per 1,000MT stem size delivery at $450/MT. Includes surveyor costs, temperature delivery range and density delivery range but does not include dip tank measurement errors. A temperature measurement delta of 10°C amounts for up to US $3,150. A 3kg/m3 density difference amounts for up to US $1,500. These variables can be avoided by the use of a secure mass flow metering system, therefore negating the need of a quantity surveyor, with an estimated cost of up to US $2,000.

**comparison versus manual tank gauging

 

Photo credit: Manifold Times
Published: 12 January, 2022

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Interview

Interview: Alkagesta navigates risk from bunkering ops during turbulent times

As the industry navigates this period of uncertainty, the key question is no longer ‘what will fuel cost?’ but rather ‘will fuel be available?’, highlights Mithat Çiftçioğlu.

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Mithat MT

Mithat Çiftçioğlu, Marine Fuels Director at Alkagesta, shared his opinion on risk management for bunkering operations under current geopolitical tensions through the April edition of shipping magazine Deniz Ticaret.

The maritime publication, part of the Turkish Chamber of Shipping (İMEAK Deniz Ticaret Odası), has given Manifold Times permission to republish the article:

Fueling Ships in Turbulent Times

From Oil Shock to Fuel Access Crisis: A New Risk Map for Maritime 2026

The final weeks of the first quarter of 2026 mark one of the most complex periods in recent years for global energy and maritime markets. The sharp rise in oil and refined product prices since February 28 may look like a classic energy shock at first glance, but developments in the maritime sector point to a far deeper structural rupture.

What is being debated in the market today is no longer just oil prices. For traders and shipowners operating in the maritime sector and bunker market, the real issue is not the price of fuel — it is access to fuel. The fundamental question in the market has shifted: not what will the price of fuel be, but will fuel even be available?

In light of the Force Majeure cancellations at Asian ports over the past two weeks, another question must also be considered: Will pre-agreed bunker supply contracts actually be delivered?

From Oil Prices to Logistical Reality

Tensions in the Middle East have created a strong geopolitical risk premium in the oil market. Brent crude briefly surpassed the $100 per barrel mark, triggering a search for a new equilibrium across markets. This will inevitably bring inflation and recession back onto the global agenda in the months ahead.

But the rise in oil prices does not only reflect the risk of supply disruption — it also signals the return of one of the most fragile chokepoints in global energy trade:

The Strait of Hormuz

Approximately one-third of the world’s oil trade passes through this narrow waterway. Around 20 million barrels of oil and petroleum products transit Hormuz daily. Any disruption here would therefore affect not only oil prices, but also global refined product flows and the bunker market directly.

Why Strategic Oil Reserves Are Not the Solution

A commonly proposed solution in energy crises is the release of strategic petroleum reserves. However, releasing these reserves does not directly resolve a bunker crisis. Strategic reserves consist of crude oil. To produce bunker fuel, the following chain must be completed:

Crude oil → Refinery → Product logistics → Bunker port

This process takes time. Strategic reserves can temporarily stabilize oil prices, but they cannot solve the access problem in the bunker market in the short term.

Furthermore, the announced reserve release of 400 million barrels, to be drawn down at a rate of 2.5–3 million barrels per day, can only cover a small fraction of the estimated daily loss from the Middle East — optimistically 8–10 million barrels, pessimistically 18–20 million barrels per day.

A Historic Surge in Bunker Fuel Prices

The per-ton price of VLSFO (0.5% sulfur) bunker fuel has surpassed $1,000, reaching approximately double pre-war levels. This also represents some of the highest prices seen since July 2022.

While prices at bunker hubs such as Singapore and Fujairah are approaching $1,100 per ton, European markets have remained comparatively lower.

The Real Problem Is Not Price — It Is Fuel Access

Obtaining bunker quotes for April has become increasingly difficult, particularly at Asian ports. Even where shipowners and traders can secure quotes, the absence of supply guarantees makes pricing extremely challenging.

A senior executive at Oldendorff Carriers summarized the situation in these words:

“We cannot price cargo because we cannot calculate fuel costs; we cannot calculate fuel costs because there is no supply guarantee.”

The CEO of Maersk has compared the current situation to the pandemic era, stating that companies are attempting to source fuel through methods they have never tried before in order to keep global shipping networks supplied.

While supply is tight and prices are near their peak in Singapore and Fujairah, Rotterdam appears relatively more balanced. However, as the conflict drags on, risk perception in European markets is also rising.

The surge in bunker prices will not only increase costs — it will also affect global maritime transport capacity. Ships are expected to reduce their speeds to conserve fuel. This could lead to a reduction in effective carrying capacity, creating new logistical bottlenecks in global trade.

The importance of working with reliable, long-term partners has never been more apparent than during a crisis such as this.

The Widening Price Spread Between Fuel Types

A notable development in the bunker market in recent weeks is the rapid widening of price differentials between different fuel types. Two spreads in particular have expanded significantly:

  • Marine Gas Oil (MGO) – VLSFO
  • VLSFO – HSFO

Rising demand for distillate products, refinery production balances, and regional supply tightness are all contributing to this widening. As a result, bunker purchases have become not merely a matter of price level, but a strategic decision tied to product type and port selection.

An Unexpected Development: Biofuels Becoming Competitive

Another noteworthy development in the bunker market is that biofuels have remained at relatively competitive price levels. This creates two important opportunities for shipowners.

On one hand, biofuels remain competitively priced in certain markets. On the other, they offer a means of compliance with new regulations entering into force in Europe — particularly the FuelEU Maritime and EU ETS frameworks, which require reductions in carbon intensity. In this context, biofuels have become a strategic option for many shipowners.

Conclusion: Active Bunker Management Is The New Normal

The 2026 bunker market presents one of the most complex energy trading environments in recent years. The rise in oil prices, geopolitical risk at the Strait of Hormuz, tightness in physical fuel supply, and widening price spreads between fuel types have made bunker fuel management more critical than ever.

The prevailing view in energy markets is that as long as the risk at the Strait of Hormuz persists, turbulence in the bunker market will persist with it. As time passes, the depletion of commercial stocks may deepen the existing supply tightness further.

For this reason, the current situation is viewed not merely as an energy crisis, but as a new stress scenario testing the logistical infrastructure of global trade.

The view increasingly heard across energy markets is this:

“As long as Hormuz remains closed, it will not be oil prices but fuel access that constitutes the defining risk for global shipping.”

Finally, for shipowners and operators, bunker strategies are shifting away from a passive purchasing approach toward a model grounded in active risk management.

 

Photo and article credit: Deniz Ticaret
Published: 7 May 2026

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Analysis

T&E: Overreliance on traditional bunker fuels costs shipping USD 395 million a day due to Iran conflict

Development has made alternative fuels increasingly more competitive, states Eloi Nordé, shipping policy officer at T&E.

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The Hormuz crisis adds over 300 million a day to shippings fossil fuels bills

The European Federation for Transport and Environment (T&E) on 27 March highlighted the adoption of green marine fuels would reduce the shipping industry’s exposure to fuel price shocks in future.

It noted shipping companies are spending an extra €340 million (USD 394.74 million) a day in additional fuel costs as a result of the latest conflict in the Gulf.

As 99% of the global fleet runs on fossil fuels, the industry is directly exposed to fuel price volatility and supply disruptions. Efficiency measures, electrification and e-fuels would reduce the industry’s exposure to price fluctuations.

According to T&E, marine fuel prices have escalated rapidly, with VLSFO reaching €941 per tonne in Singapore, up 223% since the start of 2026. At the same time, LNG prices have risen by 72% since early March. Since February 28, shipping companies have incurred more than €4.6 billion in additional fuel costs.

The development has made alternative fuels increasingly more competitive. As fossil fuel prices reach record highs again, the cost gap with e-fuels is narrowing.

T&E’s research shows that the cost gap between marine gas oil – one of the more expensive fossil fuels – and e-fuels has shrunk to near parity (+5%) in some ports.

Hormuz oil crisis boosts potential e fuel competitiveness

While the trend may be temporary, it shows that the volatility of fossil fuel markets offsets much of the structural cost disadvantage of clean fuels.

“Chaos in the Strait of Hormuz is putting global maritime trade under the spotlight. But it’s on the oil markets where its impact will be felt the most. The war is costing the industry millions every day,” said Eloi Nordé, shipping policy officer at T&E.

“Some governments and parts of the industry have spent the last year bashing green maritime measures as being too expensive, yet those costs pale in comparison to this super-disruption.

“If anything, this crisis should be the catalyst for more investment in European e-fuels and greater uptake of energy efficiency measures to avoid fossil fuel shocks in the future.”

 

Photo credit: European Federation for Transport and Environment
Published: 2 April 2026

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Business

Interview: Nunchi Marine believes Iran war forces a reset in bunker cargo trading

Tomas Stacy, Managing Director of Bunker Trading at oil cargo and bunker trading company, Nunchi Marine, comments on volatility, supply disruption and survival in a fractured market.

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The war involving Iran has pushed the global bunker market into one of its most turbulent periods in recent memory, with Singapore – the world’s largest bunkering hub – feeling the impact.

Once‑reliable supply chains have been disrupted, price volatility has surged to extreme levels, and bunker cargo traders are being forced to abandon long‑standing strategies in favour of defensive, risk‑driven decision‑making.

The sharp reduction in Middle Eastern supply flows has exposed structural vulnerabilities in the market, while suppliers and traders alike have tightened terms amid unprecedented uncertainty.

Against this backdrop, bunker cargo trading has shifted from margin optimisation to survival mode. In this executive interview, Tomas Stacy, Managing Director of Bunker Trading at Singapore-headquartered independent oil cargo and bunker trading company, Nunchi Marine shares how the conflict is reshaping bunker cargo trading, the challenges importers now face, and what it takes to navigate a market defined by scarcity, volatility and risk.

MT: How has the Iran war changed the bunker cargo trading landscape in Singapore?

TS: The change has been structural rather than cyclical. The market is now characterised by extreme price volatility, tighter availability, and far more defensive behaviour from both traders and physical suppliers. The conflict has disrupted a core supply artery into Asia, and that has exposed just how dependent Singapore has been on stable Middle Eastern flows. Trading today is less about optimising margins and more about managing risk and ensuring continuity of supply.

MT: What has been the most immediate impact on bunker cargo importers since the conflict began?

TS: Margin pressure and uncertainty have intensified almost overnight. The sharp drop in tanker movements through the Strait of Hormuz has effectively choked a primary supply source, and that has translated directly into price shocks. Since the war began, VLSFO prices in Singapore have more than doubled, while MGO prices have surged even more sharply. For importers, this has made forward planning extremely difficult and increased exposure on every cargo decision.

MT: Why has the market struggled to replace lost Middle Eastern barrels?

TS: The scale of the disruption is the key issue. The Middle East typically supplies around 1.2 million metric tons of fuel oil per month to Asia, and there is no simple replacement for that volume. Alternative supplies from the Americas or Russia exist, but they are constrained by high freight costs, sanctions, or limited availability. In practical terms, arbitrage opportunities into Singapore have become largely unworkable, leaving the market structurally tight.

MT: How has extreme price volatility changed trading behaviour and supplier relationships?

TS: Volatility has fundamentally altered risk appetite. At the onset of the conflict, prices were moving by as much as $100 to $150 per metric ton in a single day, which makes holding large cargo positions highly risky. In response, physical suppliers have become increasingly defensive—rationing volumes, prioritising long‑standing customers, and avoiding even short‑term term contracts. For traders, this has meant smaller position sizes, shorter, and a much greater emphasis on counterparty strength and reliability.

MT: Beyond price and supply, what risks are now top of mind for bunker cargo traders?

TS: Quality and logistics have moved sharply up the risk agenda. Recent alerts around off‑spec VLSFO in Singapore which were linked to engine damage, have added a new layer of concern for cargo procurement. At the same time, tight supply conditions are beginning to create logistical bottlenecks, with some vessels struggling to secure bunker slots and early signs of congestion appearing at major ports. In this environment, survival depends on disciplined risk management—avoiding long‑term fixed‑price exposure, strengthening supplier relationships, enforcing stricter quality controls, and building greater operational flexibility into voyage planning.

 

Photo credit: Manifold Times
Published: 31 March 2026

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