Business

Intergr8 Fuels: Should the industry worry about decreasing VLSFO viscosity?

Decreasing VLSFO viscosity affects pour points, resulting in wax sludge and other handling difficulties, despite the decline in off-spec VLSFO cases, finds analysis.

Published

6 years ago

March 19, 2020

Admin

[vc_row][vc_column][vc_column_text]Integr8 Fuels, the bunker trading and brokerage arm of Navig8, on Wednesday (18 March) published an article outlining the importance of noting VLSFO viscosity when analysing quality; it was written by Anton Shamray, Senior Research Analyst, and shared with Manifold Times:

VLSFO quality remains a headline IMO2020 topic. As suppliers are getting more experienced at producing VLSFO blends, the proportion of off-spec tests has been declining, although certain quality concerns remain. One of these is the reduction in viscosity, which is due to more distillate blending. This has resulted in vessels being required to adjust age old practices in order to handle and consume the fuel and moreover requires a change in tact when procuring bunkers. The choice of fuel is often limited, however checking quality before buying is as important as ever in order to minimise the risk of claims.

Lower off-specs but watch viscosity and associated issues

Up until recently, the main concern with regard to VLSFO quality was the relatively high number of off-specs, compared with the other grades like HSFO and LSMGO, and particularly on the “sensitive” parameters. However, as seen in Figure 1, this is now changing and the share of VLSFO off-specs has been declining.

On the other hand, it was found that it is not always necessary for a fuel to be off-spec to result in quality issues when it comes to storing and consuming it. As the market adjusts to the IMO2020 switch and pricing makes it favourable, more distillates have recently made their way into the VLSFO blending pool. As suppliers are getting more experienced at producing VLSFO blends the proportion of off spec tests has been declining, although certain quality concerns remain.

Figure 2 shows the increase in the share of distillate based VLSFO blends and the associated reduction in viscosity.

Indeed, viscosity dropped globally from around 160cst in early November to around 100cst by March, a drop of over 35%.

At the same time the share of distillate based VLSFO went up from around 20-25% to 35-40%. The viscosity drop has affected most bunker hubs. For example, viscosity in ARA dropped 30cst by March to 100cst and there was a bigger decrease in Singapore, from 170cst down to 90cst, with an even bigger reduction in Malta, from 150cst to 50cst.

The trend of lowering viscosity in combination with other factors is a cause for concern. Viscosity, density, pour point, aluminium and silicon (ALSI), and sediment potential (TSP) require careful assessment when purchasing and consuming the fuel.

While the majority of ports recorded very few off-spec fuels in January, several locations were particularly affected.

Viscosity and Pour Point

In the past the effective purification of HSFO required a temperature of 98 deg. C for any fuel over 180cst. Given that many VLSFO fuels are now well below this viscosity level, the purifier temperature is adjusted lower to achieve 20-24cst viscosity in the purifier (for example 58 deg. C for a 30cst fuel).

However, the new VLSFOs are more paraffinic (waxy) and with a higher pour point than HSFO. Under reduced purifier temperatures such fuels may tend to produce wax sludge, which could cause serious handling difficulties; it could also potentially affect the efficiency of removing particles such as aluminium and silicon to safe levels.

It is also essential to inject VLSFO into the engine at the correct injection viscosity. For very low viscosity VLSFO the temperature to achieve the correct injection viscosity may well be on, around, or in extreme cases below pour point (at which the fuel no longer flows) and the wax appearance temperature. For example, in order to inject a 5cst and +12 pour point VLSFO.

The trend of lowering viscosity in combination with other factors is cause for concern it has to be heated or cooled to 18 deg. C, which is only 6 deg. C above pour point (recommended min. 10 deg. C above pour point). In trying to rectify this by increasing the injection temperature the corresponding fuel viscosity would fall, in effect leaving an impossibly small window to operate in outside of which poor combustion, deposit formation and loss of energy may occur even though the fuel is fully compliant with the contractual specification.

Therefore, some owners may prefer buying VLSFO with a minimum 30cst viscosity for RMD/E/G/K grades where pour point is limited to 30 deg. C maximum. Alternatively, if the fuel available is less than 30cst viscosity, it is recommended to be sold against the RMA 10 or RMB 30 spec for which there is a much tighter 6 deg. C (0 deg. C for the winter spec) limit on pour point.

Density and Viscosity

High density in combination with low viscosity remains a cause for concern for VLSFOs, similar to HSFO due to the possibility of poor or delayed ignition and combustion which can result in engine damage. This is also reflected in high CCAI readings in such fuels. It is important to remember that the 2005 ISO specification does not offer CCAI protection.

Analysing over 15,000 VLSFO test results it was found that TSP (the ability of the fuel to deposit sediment) appears to trend up with a decrease in viscosity (Figure 3). This may be due to distillate blending and where different VLSFO components (paraffinic, naphthenic, aromatic) are mixed together in a blend.

Moreover, given that the hot filtration test is performed at 100 deg. C the effects of lower purification temperature (due to fuel’s low viscosity) on the purifier with regard to wax formation may not be fully identified.

Overall, VLSFO quality seems to be improving with fewer samples tested offspec, however checking quality before buying is as important as ever. The ISO spec sets the upper limit for most parameters and it was found that even with all parameters on-spec, some VLSFOs may be more problematic than others.

This is not normally the case with HSFO where most parameters vary in a much narrower range and average viscosity, despite dropping slightly recently, is still around 300cst.

When it comes to bunker procurement, Integr8 Fuels provides its customers with full information not only on the price but also on quality, availability and delays. By analysing global trends and changes in quality, Integr8 Fuels are well positioned to help procure quality fuels and minimise the risk of claims.

Source and photo credit: Integr8 Fuels
Published: 19 March, 2020[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_gallery type=”image_grid” images=”9330,9331″ title=”Additional Information”][/vc_column][/vc_row]

Financial Result

Bunker Holding exceeds FY2025/26 forecast despite geopolitical headwinds

Bunker Holding delivered a gross profit of USD 424 million and a profit before tax of USD 73 million, exceeding the Group’s expectations for the year.

Published

23 seconds ago

June 17, 2026

Admin

Bunker Holding on Tuesday (16 June) said it delivered a strong performance in the financial year 2025/2026 despite continued uncertainty across global markets.

The year was shaped by geopolitical developments, evolving trade flows, periods of heightened market volatility, and strong competition.

These conditions were further amplified by developments in the Middle East, which added complexity across global energy markets and shipping routes.

In response, Bunker Holding focused on getting closer to customers and understanding the different challenges faced across shipping segments. This enabled faster decision-making, greater agility under pressure, and allowed the Group to respond effectively while continuing to support customers reliably.

Against this backdrop, Bunker Holding delivered a gross profit of USD 424 million and a profit before tax of USD 73 million, exceeding the Group’s expectations for the year. Equity increased to USD 342 million.

Revenue amounted to USD 13.1 billion, a decrease of 4% compared to the previous year. The decline primarily reflected lower average oil prices during the financial year, despite periods of heightened market volatility and stronger pricing towards the end of the period.

“This year, we have taken important steps to strengthen Bunker Holding for the future. We have simplified parts of the organisation, brought teams closer together, and made the changes needed to make us more focused and efficient. Our markets remained challenging and unpredictable, but I am pleased with both the result we have delivered and the progress we have made,” said Peder Møller, CEO of Bunker Holding.

Looking ahead to 2026/27, Bunker Holding anticipates intense market competition alongside continued investments in low- and zero-carbon fuel projects and partnerships.

Changes to the Board of Directors

Bunker Holding said the company is strengthening its Board of Directors with the appointment of several new members and a new Chairman of the Board.

Nina Østergaard, CEO and co-owner of USTC, will assume the role of Chairman of the Board, while Henrik Andersen, Group President and CEO of Vestas Wind Systems A/S, will join as Vice Chairman. Tina Revsbech, CEO of Maersk Tankers, and Kenneth Steengaard, Chairman of the Board of Global Risk Management, will join the Board as new members.

At the same time, current Chairman Klaus Nyborg and Board member Peter Frederiksen will step down from the Board.

Nina Østergaard, incoming Chairman of the Board, said: “I am excited to take on the role as Chairman of Bunker Holding at an important time in the company’s development. Bunker Holding has a strong market position, a clear strategic direction, and significant opportunities ahead. I am also pleased to welcome Henrik Andersen, Tina Revsbech, and Kenneth Steengaard to the Board. They each bring valuable experience and perspectives, and I am particularly pleased that we have attracted such strong international profiles as Henrik and Tina, whose leadership experience from Vestas and Maersk Tankers will further strengthen the Board and support the company’s continued development.”

The addition of Kenneth Steengaard moves Bunker Holding closer to its sister-company Global Risk Management and adds important insight into risk management.

Bunker Holding founder and co-owner Torben Østergaard-Nielsen thanked the departing Board members for their contributions to the company.

Photo credit: Bunker Holding
Published: 17 June, 2026

Business

Oilmar establishes Board of Directors amid international expansion

Three directors are Chief Executive Officer Yusif Mammadov, Chief Finance Officer Nain Shafi, and Legal, Credit and Compliance Head Taira Shikhiyeva.

Published

3 minutes ago

June 17, 2026

Admin

Oilmar formalises Board of Directors amid international expansion

UAE-based marine fuel and petroleum products trader Oilmar on Tuesday (16 June) announced the formal establishment of its Board of Directors, marking an important milestone in the company’s evolution.

The three directors are Chief Executive Officer Yusif Mammadov, Chief Finance Officer Nain Shafi, and Legal, Credit and Compliance Head Taira Shikhiyeva.

The formation of the Board was first communicated during Oilmar’s Q1 2026 Townhall as part of a wider governance enhancement initiative and has now been formally implemented.

The Board has been established to provide strategic direction, oversee risk management and governance matters, and support the company’s continued growth across its global operations.

“At inception, the Board comprises three Directors with extensive international experience across the energy, maritime, shipping, and commodity trading sectors. Together, they bring a wealth of industry knowledge and strategic expertise to support the company’s continued growth and development,” the company said.

“The Board is expected to be further strengthened through the appointment of additional Executive and Non-Executive Directors as the company continues to expand its international footprint.”

As part of the enhanced governance framework, strategic direction, risk appetite, and key business objectives will be determined at Board level, while regional management teams will remain responsible for execution within their respective markets. This structure strengthens accountability, promotes effective decision-making, and supports the Company’s long-term growth and succession objectives.

CEO Yusif Mammadov, said: “The establishment of the Board marks the next stage in Oilmar’s development as a global energy and marine fuels business. It creates a governance framework that will support our future growth, strengthen oversight across the organisation, and ensure that our strategic decisions are guided by long-term value creation and responsible risk management.”

Photo credit: Oilmar
Published: 17 June, 2026

Alternative Fuels

Wah Kwong subsidiary appoints Nordic Green Biotrading as European distributor

Nordic Green will have the exclusive right to market, promote, and distribute Venture Energy’s supply of RED Advanced bio-methanol and RFNBO-methanol across the EEA, UK, and Switzerland.

Published

5 minutes ago

June 17, 2026

Admin

Wah Kwong subsidiary appoints Nordic Green Biotrading as European distributor

Venture Energy, a sustainable fuels supplier headquartered in Hong Kong, recently announced the signing of a Distribution Agreement with Nordic Green Biotrading ApS (Nordic Green), appointing the Danish company as its exclusive distributor of renewable methanol across the EEA, the United Kingdom, and Switzerland.

The move marked a key step in expanding Venture Energy’s next-generation marine fuels platform into the European market.

Venture Energy is a subsidiary of Hong Kong shipowner Wah Kwong Maritime Transport, focusing on the procurement and trading of clean fuels.

Under the agreement, Nordic Green will have the exclusive right to market, promote, and distribute Venture Energy’s supply of RED Advanced bio-methanol (bio-methanol) and RFNBO-methanol (e-methanol) throughout the Territory.

“We are delighted to formalise our longstanding collaboration with Nordic Green as our strategic distribution partner in Europe, extending the breadth and quality of our downstream coverage for our supplier network and developing the profile of high-quality renewable methanol producers in the European market.” said Gregor McMillan, Executive Director of Venture Energy.

Deepak Devendrappa, General Manager of Venture Energy, said: “Nordic Green’s track record in local distribution, deep market knowledge, and strong customer relationships across the region’s core bio-blending and chemical sectors make them the ideal partner to bring our ISCC-certified renewable methanol to our customers in the territory.

“This agreement is another step in the road for Venture Energy as we act on Wah Kwong’s commitment to supporting the energy transition with reliable, sustainable fuel solutions.”

The distribution agreement covers sales within the dutiable area of the EEA, the United Kingdom, and Switzerland. Venture Energy will continue to market directly into the marine bunkering segment.

Bo Gleerup, representing Nordic Green, added: “This exclusive partnership represents a significant milestone for Nordic Green. Being able to sell Venture Energy’s high-quality, certified, renewable methanol volumes from a range of bio-methanol and e-methanol producers, complement our existing supply network for European road-fuel and chemical producers. This fresh focus allows us to offer some of the most competitive products coming into the market today. We look forward to working closely

with our colleagues at Venture Energy to develop this collaboration and deliver value to our shared customers across the territory.”

Photo credit: Venture Energy
Published: 17 June, 2026