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Fuel Testing

VPS: Cold flow characteristics of biodiesel blended petroleum distillates

Dr. Sunil Kumar highlights how environmentally friendly biodiesel bunker blends can be negatively impacted by cold weather environments and how VPS testing methods could help ship operators ensure safe navigation through low temperatures.

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Dr. Sunil Kumar of marine fuels testing company VPS on Tuesday (12 March) discussed how environmentally friendly biodiesel blends can be negatively impacted by cold weather environments. 

The article also highlighted VPS offering various test methods in place to evaluate the cold flow property of the biodiesel blended fuels, which can help the ship operators to make the right decision how to handle the fuel at low temperatures: 

Environmentally friendly fuels like biodiesel blended with petroleum distillates can have an impact on the cold flow property. Currently biodiesel is one of the choices which is renewable, biodegradable, and less toxic compared to fossil fuels. Biodiesel significantly reduces carbon dioxide, carbon monoxide, sulfur oxides, volatile organic compounds, particulate matter, and unburned hydrocarbons when compared to petroleum distillates like Marine Gas oils (MGO), very low sulfur fuel oil (VLSFO) and Heavy fuel oil (HFO).

Cold flow prediction of biodiesel blended petroleum distillates is very important when a ship is sailing through cold weather regions. The cold flow characteristics of a blended fuel can be different from the individual fuels used for blending. MGO, VLSFO and HFO basically originate from fossil fuels whereas biodiesel is from a renewable source. Both are essentially hydrocarbons but contains compounds with different structural characteristics and properties. So, the structural difference of the compounds responsible for the cold flow property shall be considered since it is a physical phenomenon. This will have an impact on the cold flow property of the fuel since the blend is from two different origins and can sometimes lead to unpredictable paraffin agglomeration.

Veritas Petroleum Services (VPS) has various test methods in place to evaluate the cold flow property of the biodiesel blended fuels. The Laboratory determined test results can help the ship operators to make the right decision how to handle the fuel at low temperatures. 

Cold Flow Property of Biodiesel, MGO, VLSFO and HFOBiodiesel, MGO, VLSFO, and HFO share a common characteristic: the presence of polymethylene groups influencing cold flow properties. The severity of low-temperature flow centers on the amount of heavier paraffins present, with longer polymethylene chains exacerbating the impact. Biodiesel, while advantageous in many respects, falls short in cold flow performance, prone to wax crystallization in colder climates, leading to potential filter blockage and potential engine damage. The composition of these fuels, particularly the presence of saturated and unsaturated paraffins, significantly affects their cold flow properties. Different feedstocks for biodiesel production yield varying performance in low temperatures; for instance, palm oil-based biodiesel fares worse than soybean-based biodiesel due to differing paraffin characteristics. Origin, whether plant or animal-based, profoundly influences cold flow properties, necessitating meticulous evaluation, especially in blends with MGO, VLSFO, and HFO. Proper assessment of low-temperature behavior is critical for blended fuels with diverse sources and characteristics.

VPS Laboratory Scale Evaluation

There are several test methods used to determine the cold flow characteristics in fuels like MGO, VLSFO, HFO, biodiesel, and their blends. VPS utilises four main methods: Cloud Point (CP), Pour Point (PP), Cold Filter Plugging Point (CFPP), Wax Appearance Temperature (WAT), and Wax Disappearance Temperature (WDT). CP indicates the onset of paraffin crystallization, serving as an estimate for operational limits. PP signifies near-complete paraffin crystallization and guides the lowest usable temperature. CFPP indicates filter clogging due to paraffin crystallization, impeding fuel flow.

Each test offers insight into how a fuel behaves in cold conditions. However, methods ISO3015 (visual method) and ASTM D5773 (optical light source) can only be used to measure cloud point when the “petroleum products are transparent in layers 40mm in thickness”. For this reason, VPS researched and developed an “Automatic Test Method for Wax Appearance Temperature of VLSFOs” and published a White Paper on this in 2019.  

VPS Innovative (WAT/WDT) method for Non-Transparent Fuels

The ASTM D5773 method is used to determine the cloud point of clear petroleum products and biodiesels. VPS's innovation extends this to dark fuels like VLSFO, HFO, and biodiesel blends.

The VPS developed method WAT/WDT test offers a comprehensive view of wax appearance and crystallization temperatures in blended biodiesel with MGO, VLSFO, and HFO. This provides an extensive insight into low-temperature behavior, complementing conventional tests. There's a correlation between cloud point and WAT, both marking the onset of wax appearance.

Appendix 1 and 2 details some test results of various fuel types identifying the variance in the cold flow properties that are identified by tests in addition to the conventional ISO 8217 tests.

VPS Innovative Gas Chromatography (GC) method for the Biodiesel Impurities in the Fuel Blend

Impurities in biodiesel with FAME, arising from incomplete transesterification of feedstocks, can impact cold flow properties. Elevated total glycerol due to incomplete conversion and glycerol residue can cause issues like injector deposits and clogged systems. These impurities can affect cold weather performance when blended into fuels. Compounds like saturated monoglycerides (SMG) can precipitate above the blend's cloud point, potentially causing filter plugging. EN 14105 assesses free glycerol and residual glycerides in B100. VPS's innovative GC method determines mono-, di-, triglycerides, and free glycerol in biodiesel blends with MGO.

Conclusion

The diverse paraffin compositions in biodiesel blends pose challenges in establishing a general cold flow property relationship. These paraffins, from both biofuel and fossil fuel origins, add complexity to the crystallization process. The structural differences between biodiesel and diesel fuel compounds leads to an inconsistent flow behaviour of the blended fuel.

Given the unpredictable nature of low-temperature flow characteristics in blended biodiesel, comprehensive laboratory tests are crucial. Conducting CP, PP, CFPP, WAT/WDT, and GC analysis aids in understanding SMG in MGO blended biodiesel is recommended. Such thorough testing provides valuable insights into the cold flow properties of biodiesel blends.

Note: The full article by VPS accompanied with Appendix 1 and 2 can be found here.

 

Photo credit: Manifold Times
Published: 13 March 2024

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Bunker Fuel Quality

VPS: Is your vessel fully protected from dangers of poor-quality bunker fuel?

VPS have issued 21 Bunker Alerts this year, which have highlighted witnessed quality issues with the three main fuel types of HSFO (6 alerts), VLSFO (9 alerts) and MGO (6 alerts), says Steve Bee of VPS.

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Steve Bee, Group Commercial Director of marine fuels testing company VPS, on Tuesday (1 October)  wrote about mitigating fuel quality risks and safeguarding vessel operations against poor-quality bunker fuels:

As the global marine fuel mix grows, becoming more varied and consequently more complex in terms of fuel management, there is a potential increasing risk to vessels, crew and the environment, from the possible impact of poor-quality fuels.

Yet, whilst shipping looks to decarbonise, with a view to introducing low-to-zero carbon fuels, such as biofuels and methanol, these fuels currently account for approximately 1% of the fuel mix. The more traditional fossil fuels are continuing to satisfy the day-to-day demand in terms of fuels supplied to vessels at this time, with almost 230 million MT of marine fuels being bunkered last year.

The VPS database shows for all fossil fuels tested the following current Off-specifications have been identified:

Off Specification Rates by Fuel Type

VPS Bunker Alerts, are also a good indication of current fuel quality and so far to date, VPS have issued 21 Bunker Alerts this year. These alerts have highlighted witnessed quality issues with the three main fuel types of HSFO (6 alerts), VLSFO (9 alerts) and MGO (6 alerts). The 2024 alerts show significant off-specifications for 8 different test parameters, from 11 different locations, across Europe, Middle-East, Asia and the Americas. This proves fuel quality issues can arise anywhere at any time, for any fuel type or test parameter.

June 2024, saw the 7th revision of the marine fuel standard ISO8217, released to the industry. ISO8217:2024 is seen as a major step forward in terms of setting specifications for marine fuel quality. This latest revision has moved from two fuel specification tables, to four. It now includes, for the first time, specifications for VLSFO and ULSFO fuels containing 0.50% or 0.10% sulphur respectively, plus biofuels containing FAME, HVO, GTL, BTL, bio-components.

Acknowledging that ISO8217:2024, is an improvement on previous revisions of the standard, it still does not cover enough of the further potentially problematic issues of chemical contamination, cold-flow properties, microbial-growth, plus wider bio-components such as Cashew Nut Shell Liquid (CNSL), to name but a few areas of concern.

In addition, the industry has a very poor track record of purchasing fuel against the very latest revision of the ISO8217 standard. To date, VPS as the world’s largest marine fuel quality testing company, still see 12.6% of samples received for quality testing, being purchased against the 2005 revision of the standard. So, vessels are purchasing fuel against a standard which is actually only 3 months off being 20 years old? That revision has since been replaced by four further revisions of the standard over the years and it bears very little relevance to today’s fuels. Therefore, these vessels are really operating at a significantly increased level of risk, if they are relying on ISO8217:2005 to fully protect them.

The most common revision against which marine fuel is purchased today, is still ISO8217:2010. 48% of all fuel samples received by VPS, are being tested against this revision. Again, ISO8217:2010 is almost 15 years old, so why is almost half of the fuel being purchased to it? There is no consideration of VLSFO, or ULSFO fuels, with FAME also being classed as a contaminant.

The 2017 revision, still only accounts for 20% of the fuel samples VPS receive for testing, even though its nearly eight years old. However, it does consider the presence of FAME within certain distillate grades, but still offers no specification for the lower sulphur grades of residual-based fuels, where VLSFOs are the most widely purchased fuel type.

FQT Bunker Samples by ISO8217 Revision

All this means is the global fleet is buying fuel and testing its quality against a standard which is between 8-20 years old?

To date, VPS have not received a fuel sample, fossil fuel, or biofuel, purchased to the 2024 revision. Based on past history it maybe sometime before such a sample is received? Even then ISO8217:2024, whilst a major improvement to previous revisions, is not an all-encompassing standard.

As far back as 2018, The Swedish Club released their independent report, “Main Engine Damage”. This report highlighted how to avoid engine damage, including information showing the average cost of a single fuel management incident onboard a vessel was $344,069. It also stated the average cost of a single lubrication failure was $763,320.

The Swedish Club’s advice and recommendations were:

SC

Back in 2019, in the lead up to IMO2020 and the reduction in the global sulphur cap to 0.50%, VPS foresaw potential quality issues with the new incoming VLSFO fuels. These fuels would be of higher paraffinic content, leading to poorer cold-flow behaviour, potential wax precipitation and major stability issues. VPS recognised that the ISO8217 standard did not provide sufficient protection to a vessel, when using VLSFO, or even HSFO and MGO fuels.

Therefore, the VPS Additional Protection (APS) service was launched prior to 2020. This service offers the full ISO8217 test scope, plus a number of additional tests, in one package offering, at a significantly reduced price, in order to ensure a greater level of protection to vessels and enhanced peace-of-mind to the, now more informed operator, using this service.

The APS Package is customised by fuel type, to cover, HSFO, VLSFO, or Distillates. The additional tests included, will provide much more information and greater understanding of the fuel in relation to stability, chemical contamination, cold-flow properties, lubricity and microbial-activity. The package can also be further customised to individual customer requirements. Many VPS customers have used and continue to use APS, to mitigate the potential risks from poor quality fuel and benefit from the added-value and cost savings, the service delivers.

In 2022, the incoming range of marine biofuels, warranted VPS to research a number of different additional tests to assist in identifying biofuel management issues and understanding their behaviour and operational risks.  As a consequence, VPS launched the APS-BIO packages. Once again, these include the ISO8217 as a base test slate, but also include additional tests to measure energy content, stability, renewable content, microbial-activity, corrosivity and cold-flow properties. The APS-BIO suite of test slates cover different bio-components such as FAME, HVO, CNSL, plus the fossil fuels used in a bio-blend, eg HSFO, VLSFO, MGO.

Once again VPS customers, are seeing real benefits and added-value, as they look to use biofuels as their decarbonisation option, knowing that in VPS they have an experienced, expert fuel management partner.

 

Photo credit: VPS
Published: 2 October, 2024 

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Bunker Fuel Quality

NorthStandard includes VPS bunker fuel quality data in new platform

Fuel Insights app, powered by VPS PortStats, offers NorthStandard account holders with a view on fuel quality trends, based on data generated by VPS in key bunkering hubs across the globe.

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NorthStandard includes VPS bunker quality data in new Fuel Insights platform

Marine fuels testing company VPS on Tuesday (11 September) said it has been collaborating with global marine insurer NorthStandard over the past few months on incorporating fuel quality analytics into NorthStandard’s new Get SET! digital portfolio. 

This collaboration has culminated into the launch of the NorthStandard Fuel Insights platform.

The NorthStandard Fuel Insights app, powered by VPS PortStats, offers NorthStandard account holders with a customised and exclusive view on fuel quality trends, based on the data generated by VPS’ laboratories located in key bunkering hubs across the globe. 

Bunker procurement professionals can use this data to improve decision-making, by including off-specs and calorific value to the rationale, whilst technical managers can use the data to anticipate fuel quality risks to avoid bad bunkers.

The digital platform also provides insights beyond off-specs, by highlighting cautionary cases that may require additional treatment or operational advice. 

With the advent of various types and blends of biofuels in the marine industry, VPS is committed to enriching this platform with relevant and actionable insights now and in the future.

“This is a unique collaboration in marine insurance,” said Colin Gillespie, Global Head of Loss Prevention, NorthStandard.

“It offers NorthStandard members easy access to global fuel statistics, as well as the tools to trade with confidence by managing risk and reducing claims in one of the most challenging areas of ship management.”

John Oosthoek, VP Operations Digital & Decarbonisation, VPS, said: “The launch of the Fuel Insights platform is the culmination of a growing partnership between NorthStandard and VPS over the past few years. By utilising reliable fuel quality data owners and operators can anticipate and mitigate the risks associated with fuel quality, such as cat fines, cold-flow, and stability.

“Testing remains essential for verifying quality, but accumulated data also helps vessel owners and operators make informed fuel procurement decisions,” said Steve Bee, Group Commercial & New Business Development Director, VPS. 

“VPS services provide help in ensuring engines and fuel delivery systems do not suffer damage, crews stay healthy and safe, and ships achieve the required environmental legislation demands. For NorthStandard, Fuel Insights, powered by VPS will help ensure members and shipowners know what to look out for and subsequently enhance their ability to plan preventive maintenance.”

“Beyond mitigation, data could be invaluable to a claim or contract dispute,” added Gillespie. “For example, if substandard fuel was repeatedly linked to a single port, or if fuel issues on board had an onward impact of cargo delays. Shipowners and operators also need full transparency on fuel availability and quality, especially given the rapid rise of alternative fuels,” he said.

VPS controls shipping’s largest and most comprehensive marine fuel quality database, including the most extensive analysis of newer products, such as biofuels and methanol.

“Given that NorthStandard and VPS have the same forward-looking position on digitalisation, this partnership is a natural fit,” commented Bee. 

“Accurate monitoring and reporting also help reduce emissions and will improve vessel performance against carbon intensity indices to ensure owners are on the right side of history.”

 

Photo credit: NorthStandard
Published: 11 September, 2024

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Fuel Testing

FOBAS: Joint circular from MSC and MEPC on bunker fuel oil sampling guidelines

Joint circular extends the use of the MARPOL Delivered Sample to also be available for checking of the flash point requirement under SOLAS Chapter II-2/4.2.1.

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Lloyd’s Register Fuel Oil Bunkering Analysis and Advisory Service (FOBAS) on Tuesday (10 September) released a bulletin on IMO’s Maritime Safety Committee (MSC) and Marine Environmental Protection Committee (MEPC) jointly approving the fuel oil sampling guidelines during recent sessions (MSC 108 and MEPC 81):

IMO’s Maritime Safety Committee (MSC) and Marine Environmental Protection Committee (MEPC) during recent sessions (MSC 108 and MEPC 81) jointly approved the fuel oil sampling guidelines MSC-MEPC.2/Circ.18 for compliance verification with MARPOL Annex VI and SOLAS chapter II-2. 

This joint circular from MSC and MEPC was issued 11 July 2024 and revokes the previous MEPC resolution 182(59) titled ‘2009 Guidelines for the sampling of fuel oil for determination of compliance with the revised MARPOL Annex VI’.

In essence, this Circular simply extends the use of the MARPOL Delivered Sample to also be available for checking of the flash point requirement under SOLAS Chapter II-2/4.2.1 where it is referred to as the Representative Sample. The basic requirements as given by the 2009 Guidelines as regards the sampling location, arrangements and procedures are unchanged apart from the minimum sample size has been increased from 400ml to 600ml. Also unchanged are the sample labelling and sample storage aspects.

The joint circular now provides explicit references in the text to the need that personnel undertaking the sampling and the subsequent MARPOL Delivered Sample preparation, should be familiar with the use of the equipment and the Guidelines. Also, that the sampling operation itself should be witnessed by both the ship’s and supplier’s representatives. 

The one particular addition is the new Section 10 which covers the procedures and documentation requirements in those instances where the fuel oil’s flash point is to be checked. This in no way impacts on the MARPOL Annex VI Appendix VI requirements in respect of the sulphur verification procedures which are unaltered.

Moreover, with regard to the key point of keeping track of these MARPOL Delivered Samples, this is now given as being the company’s responsibility rather than the ship’s master as previously. This will be important where samples are taken off the ship for testing, but the remaining material is not subsequently returned. 

It should be noted that it is the sole prerogative of the representatives of the Parties to either MARPPOL Annex VI or SOLAS, as applicable, to take a MARPOL Delivered Sample for testing. Those sample cannot be opened or tested for any other purposes such as the resolution of commercial quality disputes.

 

Photo credit: Louis Reed from Unsplash
Published: 11 September, 2024

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