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FOBAS: Increase in engine cylinder wear on vessels consuming 0.50% VLSFO bunker fuel

The upsurge in incidents started around November 2019, but are on the decline as ships make necessary operational adjustments and gain more experience with VLSFO, it said.

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Lloyd’s Register Fuel Oil Bunkering Analysis and Advisory Service (FOBAS) on Monday (21 September) published a bulletin outlining possible reasons behind the rise in combustion related incidents resulting in cylinder liner damages of large two-stroke engines, as well as some advice on how to navigate the situation: 

Issue of Excessive Cylinder Component Wear on Large Two-Stroke Engines During the Use of 0.50% Sulphur Fuels

Fuel combustion in an engine is a complex chemical/physical reaction and has been an area of intense research over the years. Inconsistency in composition of residual marine fuels makes it even more difficult to predict. Larger engines, especially two-stroke designs, have enabled ships to burn a wide variety of residual fuels. Since the implementation of MARPOL Annex VI regulation 14.1.3 from 1st January 2020, FOBAS have seen an upsurge in combustion related incidents resulting in cylinder liner damages of large two-stroke engines. These particular incidents started to appear around November 2019 when majority of the world fleet started transitioning from high sulphur fuel oil (HSFO– max 3.5%) to very low sulphur fuels (VLSFO – max 0.50%).

Figure 1 above compares the FOBAS data for eight months (November to June) for the last two consecutive periods. The reported failure modes have been divided into four main categories i.e. sludging, fuel injection equipment failure, cylinder component damage and others.

The data indicates that overall incidents related to cylinder component damage almost doubled for the studied period (Nov-19~Jun-20) whilst sludging incidents remain on similar levels though reduction in fuel injection equipment failure incidents have been observed. Moreover, recent cylinder component

damage cases seem to have only been reported on large two-stroke main engines during VLSFO consumption. Though since March 2020, FOBAS has observed a downward trend in ships reporting cylinder component damage problems.

The Failure Mode

There could be several ways the failure could occur on two-stroke engine cylinder components, but it usually starts off with the excessive wear and then manifest itself into conditions such as blow by, scavenge fire, high liner and exhaust temperatures, low power output, excessive vibration, surging of turbocharger and so forth. The following diagram provides the basic wear types and corresponding key description.

Screen Shot 2020 09 22 at 3.18.32 PM

During the high sulphur fuels oil (HSFO) consumption, the two-stroke engines were frequently subjected to corrosive wear also known as ‘cold’ corrosion. Abrasive wear was also not uncommon due to HSFO containing higher concentration of catfines (Aluminium + Silicon) and other sediments making its way to engine inlet due to unsatisfactory fuel management. Ships switching to lower (0.50%) sulphur fuels which were less likely to cause cold corrosion (low acid-neutralisation requirement) and contain relatively lower concentrations of catfines. Though ships still reported excessive wear which is most likely to be associated with the third type i.e. adhesive wear where metal to metal contact takes place resulting in micro-seizure and scuffing.

The investigation

FOBAS was asked to investigate those incidents and whether VLSFO quality is a contributory factor. The suspected fuels were tested for standard ISO 8217 (table 2) parameters and results were satisfactory. Further testing options in cases where a ship only reported damages to cylinder components are limited. If standard parameters results are satisfactory then FIA (Fuel Ignition Analyser) test is recommended to evaluate the fuels ignition characteristics. Some of these suspected VLSFO fuels were tested and key parameters are compared against the standard HSFO in figure 3.

Screen Shot 2020 09 22 at 3.18.44 PM

Above results from FOBAS data indicate that VLSFO has seen on average around 10% improvement on various ignition parameters compared to the HSFO. Although FOBAS tested a couple samples which showed relatively poor ignition quality one from Santos, Brazil and another one from Houston, USA with estimated cetane number (ECN) of just below 10. The FIA results from Houston seems to be an exception rather than the rule however Santos fuels are known for low ECN in the past.

Nevertheless, considering the robustness of large two-stroke engines in burning fuels with varying ignition qualities and in view of CIMAC guidelines, it is not straight forward to link the fuel quality with the reported issues. Further information received from the ships reporting these problems were studied and following observations were made;

– Signs of liner scuffing with some piston ring broken or wore out excessively

– Ships did not experience operational problems on other parts of the fuel system neither on four-stroke engine operation

– Other operational parameters such as scavenge air temperature, pressures, appear to be satisfactory for corresponding operating conditions

– Some of the vessels were not fitted with hard coated piston rings as per OEM’s guidelines

– Mild deposits on piston top-land

– Most ships were using 40BN cylinder lube oil

– Ships not making any timing adjustments (fuel injection or exhaust valve) to suit various quality fuels

Probable reasons

The information received from the ships in most cases were insufficient to draw conclusions considering (ISO 8217) analysis performed on the suspect fuel samples were mostly satisfactory.

However, based on our extensive experience of dealing such investigations, following are few observations;

  1. Hard coated piston rings: One of the most common factors observed was the lack of hard coated rings on engines as per engine makers recommendation. It has been observed since 0.10% sulphur fuel usage in ECA-SOx that operation without hard coated rings are particularly vulnerable. It seems that hard coating provides better protection against the micro seizure/scuffing due to improved high temperature performance and hardness of the material over the liner material minimising the risk of micro-seizures and eventual scuffing incidents.
  2. Cylinder lube oil (CLO) feed rate: There could be cases where CLO feed rate was insufficient and in certain cases excessive. If optimum feed rate for the operational conditions are not maintained, then it would result in loss of lubrication or deposit formation. There is some evidence to suggest that at the start of transition, few ships were not fully tuned in to timely adjust the feed rates for the VLSFO usage and lower BN oils which may have contributed to the cases which were reported.
  3. CLO quality: With the majority of the world fleet using 40BN oils, there have been suggestions that higher BN (70+) shows better dispersancy characteristics compared to 40BN oils, though regular use of higher 70+BN oils may develop excessive neutralisation buffer and could result in formation of calcium deposits.
  4. Engine maintenance: Lack of engine maintenance is an important factor and it has been observed that engine components operated close to their useful remaining lives are considered vulnerable and more likely to report such issues. Running hours of engine liner, piston rings, fuel injector, fuel pump and dropping efficiency of lubricator pump over time are important factors to consider.

Conclusion

As mentioned in above paragraphs, the frequency of such incidents are on the decline with ships making necessary operational adjustments and getting more experience of burning VLSFO in their engines. At FOBAS, we welcome our customers to report any fuel related incident to help the onboard engineers overcome the problem.

In cases such as damage to cylinder liner and piston rings, it is important to seek guidance from the engine manufacturers. Moreover, ship operators should refer to their engine operations manual, consult the latest service letters and also apply a best practice approach to mitigate and avoid future occurrences.

In light of varying fuel quality VLSFOs, the use of appropriate condition monitoring tools could further reduce the risk of breakdown scenario through diagnostic capability of picking up any incipient failure. FOBAS also provides lube oil analysis and for more comprehensive engine condition monitoring our

FOBAS Engine Assessment Programme (FEAP) can be used to monitor two-stroke engine performance.


Photo credit and source: FOBAS
Published: 20 September, 2020

 

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ENGINE: Europe & Africa Bunker Fuel Availability Outlook (1 April 2026)

East Mediterranean ports see high demand; Malta sees rough weather; high demand increases lead times in West Africa.

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RESIZED ENGINE Europe and Africa

The following article regarding Europe and Africa bunker fuel availability has been provided by online marine fuel procurement platform ENGINE for post on Singapore bunkering publication Manifold Times:

  • East Mediterranean ports see high demand
  • Malta sees rough weather
  • High demand increases lead times in West Africa

Northwest Europe

Availability of all fuel grades is stable in the ARA bunkering hub, but buyers are recommended to enquire about stems around five days ahead to get competitive offers from a wide selection of suppliers, a trader said.

The ARA’s independently held fuel oil stocks slumped 20% lower in March, according to Insights Global data.

The region imported around 160,000 b/d of fuel oil in March, down from 192,000 b/d imported in February, according to cargo tracker Vortexa. Most supplies have arrived from Denmark (21%), Poland (14%) and Libya (13%).

The region’s independent gasoil inventories – which include diesel and heating oil – have dipped 1% lower in March, compared to February.

The ARA imported 289,000 b/d of gasoil, down from the 304,000 b/d in February, according to Vortexa data. Around 27% of cargo volumes have come from Kuwait, while the US has sent around 24%.

In Germany’s Hamburg, buyers are being advised to book stems with a lead time of five days, a trader said.

Bunker fuel availability is very tight in Sweden’s Gothenburg and off Denmark’s Skaw, a trader told ENGINE.

Mediterranean

Securing supplies promptly is challenging in the Gibraltar Strait ports, and buyers are advised to book around seven days in advance to secure supplies of any fuel grade, a trader said.

Demand is stable in the Port of Gibraltar, with around 40 vessels expected to call for bunkers between 1-8 April, shipping agent A Mateos & Sons said.

Congestion caused in the port last week due to rough weather conditions has completely cleared as of Wednesday morning, port agent MH Bland said.

In Barcelona, buyers are usually requested to give a week’s notice for any delivery, but supplies can be arranged sometimes on a prompt basis, a trader told ENGINE.

Bunker availability is tight in the Canary Islands bunkering hub of Las Palmas, a trader said. Suppliers are giving earliest delivery dates around 10 days out for stems with competitive prices, the trader added.

Bunkering operations are currently being conducted in the inner anchorage and at the berth due to rough seas, port agent MH Bland said.

Malta is experiencing rough winds of more than 25 knots and waves of more than 2.5 metres, and the conditions are expected to persist until 3 February.

Bunkering operations off Malta have been currently suspended, port agent MH Bland said.

Some operations can be conducted in the sheltered Area 1 and Area 4, and operations are expected to resume normally in the offshore area around Saturday, shipping agent WMR told ENGINE.

Bunker demand has decreased recently off Malta, a trader said.

Fuel availability is steady in the Greece’s Piraeus, but high demand for bunkers is causing operational challenges related to barge and berth availability, a local supplier said. The port may face tight product availability around late April or early May if the conflict continues and crude flows through the Strait of Hormuz continue to remain disrupted, the supplier added.

Fuel availability is stable in Turkey’s Istanbul and demand is very strong, a local supplier told ENGINE. Buyers are securing bunkers as they anticipate tight availability next month, the supplier added.

Africa

Ships re-routing around the Cape of Good Hope have increased bunker demand in African ports, suppliers and traders told ENGINE.

West African ports are experiencing low product availability as demand is rising and supply is not able to keep up, a major supplier in West Africa said.

Lead times have increased significantly in many bunkering hubs due to the additional demand.

In Togo’s Lome and off Namibia’s Walvis Bay, buyers are recommended to enquire about stems around 10-11 days ahead, a trader said.

In Angola’s Luanda, one supplier has stopped supplying VLSFO, while LSMGO supplies may need around 7-10 days of notice, a supplier told ENGINE.

Getting VLSFO supplies in Nigeria’s Lagos anchorage also requires around 10 days of notice, a local supplier said.

In South Africa, availability is stable off Algoa Bay, a trader said. In Durban, LSMGO is priced around $3000/mt.

By Nachiket Tekawade

 

Photo credit and source: ENGINE
Published: 2 April 2026

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IMO: Caribbean maritime leaders draft policy recommendations to decarbonize shipping

Participants focused on moving from analysis to implementation by aligning policy, infrastructure planning, energy systems and finance.

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IMO: Caribbean maritime leaders draft policy recommendations to decarbonize shipping

The International Maritime Organization (IMO) on Tuesday (3 February) said Caribbean policymakers and financiers have emphasized that decarbonization will not succeed through isolated projects or technologies alone, but through coordinated action across sectors and countries, supported by evidence-based planning and investment-ready pathways. 

Senior representatives from Caribbean governments, maritime administrations, ports, energy authorities, development banks and financial institutions met for a regional roundtable convened in Port of Spain, Trinidad and Tobago (29 – 30 January) by IMO’s GreenVoyage2050 Programme, in collaboration with Global MTCC Network (GMN Phase II). 

The event, under the theme Unlocking maritime decarbonization, resulted in key draft policy recommendations for the region, including proposals for: 

  • enhanced regional coordination to harmonize national policies; 
  • knowledge-sharing; 
  • capacity building; and 
  • investment facilitation.  

Participants focused on moving from analysis to implementation by aligning policy, infrastructure planning, energy systems and finance. The participation of multilateral and regional development banks alongside policymakers and industry linked technical ambition with financial realism at an early stage. 

Dr Jose Matheickal, Director of the IMO’s Technical Cooperation and Implementation Division, underscored the need to bridge global ambition and national delivery: “The IMO GHG Strategy sets a clear global direction, but implementation happens at country and regional level. What is critical is creating the conditions, policy, institutional capacity and credible project pipelines, that allow finance to flow and turn ambition into action.” 

The first day of discussions connected the 2023 IMO GHG Strategy with delivery through technical cooperation and regional collaboration.  

Findings from the Jamaica Maritime Alternative Fuels Study, supported by the GreenVoyage2050 Programme, were shared to ground the regional dialogue in a concrete country example. The study illustrated how Caribbean States can assess future fuel demand, supply pathways, infrastructure needs and policy implications to inform investment and planning decisions. 

Building on this evidence, participants discussed credible fuel pathways for the region, barriers to adoption and where regional coordination could accelerate progress. Interactive mapping exercises captured existing initiatives, infrastructure gaps and opportunities for collaboration across the Caribbean, while practical examples demonstrated how policy intent is already translating into action through green port development, fleet initiatives and pilot projects. 

 

The second day of the roundtable focused on unlocking investment, with development banks and financial institutions outlining what is needed to improve project bankability and mobilize public and private finance.  

Discussions explored financial instruments, risk-sharing approaches and policy signals required to support investment in ports, clean fuels and maritime infrastructure, reinforcing the importance of aligning national priorities with financier expectations. 

Ms Thandi McAllister, Director – Legal Services, Maritime Administration Department, Guyana, said: “This Regional Roundtable provided a vital platform for States and other maritime stakeholders to gain valuable insights into the impact and opportunities that are optimizable by Caribbean SIDs and LDCs in their pursuit of decarbonisation goals.” 

Finally, the participants visited the ammonia-fuelled ship Fortescue Green Pioneer for a first-hand look at alternative fuel technology in use onboard.

 

Photo credit: International Maritime Organization
Published: 5 February, 2026

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ICS and 47 governments submit GHG pricing mechanism proposal to IMO

Key purpose of mandatory GHG charge will be to reduce cost gap between zero/near-zero GHG emission fuels and conventional bunker fuels to incentivise accelerated uptake of green energy sources.

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The International Chamber of Shipping (ICS) on Thursday (9 January) said it has joined 47 governments in a joint submission to the final round of negotiations at the United Nations’ International Maritime Organization (IMO) to adopt a maritime greenhouse gas (GHG) emissions pricing mechanism to achieve net zero GHG emissions from international shipping by 2050. 

The joint text is supported by major shipping nations such as Greece, Japan, Korea and the United Kingdom, the world’s largest flag States including Bahamas, Liberia, Marshall Islands and Panama, all EU States (and the European Commission), other African countries such as Nigeria and Kenya, plus Small Island Developing States from the Caribbean and the Pacific.

The joint submission by governments sets out convergent regulatory text for amendments to the IMO MARPOL Convention, which will require shipping companies operating ships on international voyages to make GHG contributions per tonne of CO2e emitted to a new “IMO GHG Strategy Implementation Fund”.

ICS said the key purpose of this mandatory GHG charge will be to reduce the cost gap between zero/near-zero GHG emission (ZNZ) fuels such as green methanol, ammonia and hydrogen and conventional bunker fuels, to incentivise the accelerated uptake of green energy sources. 

Revenue generated will be used to reward the production and uptake of ZNZ marine fuels, whilst also providing billions of US dollars annually to support the maritime GHG reduction efforts of developing countries.

International Chamber of Shipping Secretary General, Guy Platten, said: “The industry fully supports the adoption by IMO of a GHG pricing mechanism for global application to shipping.”

“The joint text put forward by this broad coalition is a pragmatic solution and the most effective way to incentivise a rapid energy transition in shipping to achieve the agreed IMO goal of net zero emissions by or close to 2050.”

“We are very pleased that such a large and diverse group of nations now firmly supports a common approach to maritime carbon charging. This proposed joint text has been hard fought and is broadly based on ideas which ICS has been advocating for the past ten years.

“While a large number of governments now support a universal flat rate GHG contribution by ships – or something similar – a minority of governments continue to have concerns. Working in co-operation with all IMO Member States we will do our best to allay such concerns during the final stages of these critical negotiations about regulatory text.”

This mature regulatory proposal will be considered by a critical IMO meeting in February – in the week of 17 February 2025 at ISWG-GHG 18. 

If the MARPOL amendments are approved by IMO in April 2025, they should enter into force globally in early 2027, with the collection of annual GHG contributions from ships commencing in 2028.

Note: The joint proposal to IMO for a maritime GHG emissions pricing mechanism can be found here.

 

Photo credit: International Maritime Organization
Published: 10 January, 2025

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