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Fuel Waxing: Minimising the Impact on Marine Operations

A serious concern for those handling Marine Fuel is waxing – the formation of wax crystals that can have a variety of negative impacts, shares expert.




Aderco fuel waxing main photo

Vasco Passanha, Technical Manager EMEA at Aderco, on Monday (20 February) shared the impact of marine fuel waxing in an article on LinkedIn and explained how the phenomenon can be avoided. The following is an excerpt from the article:

A serious concern for those handling Marine Fuel is waxing – the formation of wax crystals that can have a variety of negative impacts.

Vasco explains it is more prone to low viscosity VLSFO fuel due to its higher paraffinic nature and shared how waxing can be minimized through proper temperature management.

Vasco explains “Paraffinic fuels contain a different mix of molecules than more aromatic-based fuels, making them more sensitive to changes in temperature and therefore more prone to waxing. When fuel drops below its Cloud Point (the temperature at which wax crystals can first form), these crystals will Agglomerate together inside the storage tanks, fuel lines and filters, clogging these components up significantly. Engineers will see this in the filters and fuel waxing can also affect the operations of the separator. To counter this issue, it's imperative that fuel is heated correctly so that the wax crystals are reincorporated correctly back into the fuel blend.”

He continues “The key takeaway here is that when it comes to heating VLSFOs, less is often more. Excessive temperatures should not be used as this can increase costs and may destabilise the fuel creating asphaltenic sludge. As VLSFO is more paraffinic the rules are not the same as HFO and needs a higher temperature than the original suggests to avoid waxing, although a higher viscosity VLSFO can still adhere to HFO temperature guidance.

Usually, a Pour Point plus 10 degrees Celsius should be sufficient in managing fuel temperature and preventing wax build-up within tanks, fuel lines and filters, however, performing a lab test to confirm the exact temperature to operate could save many operational issues.

By sticking within these parameters and making sure all other aspects of storage remain consistent, it should be easier to avoid most issues related to wax build-up in VLSFOs.”

There is an issue, he continues, with ISO 8217 catching up, as the Pour Points were based on HFO, with VLSFO being adopted as the main fuel oil only fairly recently and correct guidance is still catching up."

The table below has been created by Alfa Laval in June 2019, as a general guide to heating storage tanks and also provides separation temperature to limit operational issues.

Aderco fuel

 “To really understand your fuel, it’s best to test it regularly for determining wax liquefaction temperature. Having it tested in a lab will reveal the correct temperatures to store and handle fuel at its best.”

“One issue” He continues “heating in some storage tanks don’t go above certain temperatures, this might be due to the placement of heating coils, or goods that are being transported etc. Also, wax crystals can exist that can’t be seen, due to temperature being marginally cooler than in the ‘Goldilocks zone’ and then the separator cannot distinguish between sludge and wax crystals and therefore sends waxy fuel to the sludge tank wasting fuel and money.”

So, what can Aderco do? “Although Aderco fuel conditioners can’t help the issue itself, they can clean the engine. Aderco helps to reincorporate and restabilise fuel, post waxing. A good example in which Aderco is applied in this instance is when a ship has to shut off heating before dry dock, treat with Aderco prior, to stabilise, and to help homogenise when vessel comes out of dry dock.”

Note: The original article on LinkedIn can be obtained here.

Photo credit: Aderco
Published: 27 February, 2023

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LNG Bunkering

Singapore: Pavilion Energy supplies LNG to TFG Marine dual-fuel bunker tanker

“MT Diligence” was refuelled with 34 cubic metres of LNG bunker fuel, supplied by Pavilion Energy, marking the first LNG bunkering of TFG Marine’s bunker vessel.





Singapore: Pavilion Energy supplies LNG to TFG Marine bunker tanker

Global marine fuel supply and procurement firm TFG Marine on Monday (20 May) announced the completion of the first liquefied natural gas (LNG) refuelling of its dual-fuel bunker tanker MT Diligence this week in Jurong Port, Singapore.

The 34 cubic metres (m3) of LNG to power the MT Diligence was supplied by the Marine division of Singapore-headquartered Pavilion Energy. 

“Deploying a vessel that can be powered by LNG as well as conventional low sulphur marine fuels helps TFG Marine to meet its licence requirement with the Maritime and Port Authority of Singapore (MPA),” TFG Marine said in a social media post.

Singapore: Pavilion Energy supplies LNG to TFG Marine dual-fuel bunker tanker

“Built and operated for TFG Marine by CBS Ventures Pte Ltd, the 5,000 dwt MT Diligence has been designed to our technical specifications, including stringent safety considerations and has joined our supply fleet this year in the major bunkering centre of Singapore.”

Manifold Times previously reported TFG Marine christening the first LNG dual-fuel bunker tanker to join its fleet.  

The newbuild vessel, MT Diligence, has joined the company's low sulphur fuel oil and biofuel supply operations in the major bunkering centre of Singapore.

Related: LNG dual-fuel bunker tanker “MT Diligence” joins TFG Marine fleet for Singapore ops


Photo credit: TFG Marine
Published: 21 May 2024

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Winding up

Singapore: Liquidators schedule final meeting for Sejahtera Shipping and related companies

Final meetings will be held at 9 Raffles Place, #19-21 Republic Plaza Tower 2, Singapore 048619 for Sejahtera Shipping, Molek Shipping and Madu Shipping.





Resized benjamin child

The final meetings of Sejahtera Shipping Pte Ltd and its related companies have been scheduled to take place on 21 June, according to the company’s liquidators on a notice posted on Monday (20 May) on the Government Gazette.

The other companies are Molek Shipping Pte Ltd and Madu Shipping Pte Ltd. 

The meetings will be held at 9 Raffles Place, #19-21 Republic Plaza Tower 2, Singapore 048619 at the following times:

  1. Sejahtera Shipping at 11am
  2. Molek Shipping at 10.30am
  3. Madu Shipping at 10am

They will be held for the purposes of having accounts laid before the meeting showing the manner in which the winding-up has been conducted and the property of the company disposed of, and of hearing any explanation that may be given by the liquidator.

The details of the liquidators are as follows:

Cheng Sam Tai Catherine
c/o Crowe Horwath First Trust Corporate Advisory Pte. Ltd.
9 Raffles Place, #19-20 Republic Plaza Tower 2, Singapore 048619

A member entitled to attend and vote at the meeting is entitled to appoint a proxy to attend and vote in his stead. A proxy need not be a member of the company. The instrument appointing a proxy must be deposited at the Registered Office of the company not less than 48 hours before the time set for holding the meeting.

Related: Singapore: Sejahtera Shipping and related companies to be wound up voluntarily


Photo credit: Benjamin-child
Published: 21 May 2024

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Bunker Fuel

Island Oil eyes Korean market with new Seoul office

New office marked the company’s latest expansion within Far East and Southeast Asia markets, following the opening of the company’s Hong Kong office last year.





TANIM MUNSHI on Unsplash

International marine fuel trading firm Island Oil on Monday (20 May) announced it has established an office in Seoul.

This marked the company’s latest expansion within the Far East and Southeast Asia markets, following the opening of the company’s Hong Kong office last year. 

Additionally, Island Oil has several years of established presence in Singapore, along with a representative office in Shanghai. 

Mr. Yongje (Jayden) Choi will be heading the Seoul office as Business Development Manager. 


Mr. Yongje (Jayden) Choi

“We welcome Jayden to the Island Oil family”, said Mr. Michell Kamphorst, Head of International Trading, Asia at Island Oil.  

“His expertise in the Korean market will provide an immediate impact as we inaugurate our Seoul office, marking another significant milestone in our Asia expansion.”

“Stepping into Island Oil, I am impressed by their dedication to maintaining a culture of dignity and respect for all team members, as well as their strong commitment to fairness and transparent communication”, said Choi.

“I am excited to be a part of Island Oil's journey towards greater growth and prosperity”, he concluded.

Note: Enquiries can be sent to Island Oil’s Seoul office via email at [email protected]

Related: Island Oil continues expansion into Chinese markets with new Hong Kong trading office
Related: Island Oil and Island Petroleum receive ISCC EU certification for bio bunker fuels


Photo credit: TANIM MUNSHI on Unsplash / Island Oil
Published: 21 May 2024

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