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CTI-Maritec: Why accurate testing of energy content is essential for bio bunker fuels

Owing to the composition of bio-marine fuels, accurate measurement of NSE / Net Heat of Combustion to correctly gauge energy content of bio-marine fuels is key for efficient fuel management onboard ships.

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Louis Reed from Unsplash

Marine environmental services and fuel testing solutions company CTI-Maritec on Wednesday (8 January) shared on why one of the most important testing parameters or properties of bio-marine fuel is energy content.

Owing to the composition of bio-marine fuels, the accurate measurement of Net Specific Energy (NSE) / Net Heat of Combustion to correctly gauge energy content of bio-marine fuels is key for efficient fuel management onboard ships: 

Introduction

Bio-marine fuel is widely adopted as a drop-in fuel to achieve the current emission requirements in the shipping industry. ISO 8217:2024 specification allows bio-marine fuels to contain up to 100% fatty acid methyl ester (FAME). The major production route of FAME is transesterification of vegetable oils, animal fats or used cooking oils with methanol using alkaline catalysts. The ISO 8217:2024 version has included additional test parameters to measure FAME content, energy content and oxidation stability for bio-marine fuels.

Accurate Net Specific Energy (NSE) assists with efficient fuel consumption management

In this newsletter article, we review why one of the most important testing parameter or property of bio-marine fuel is Energy Content. Accurate measurement of NSE for energy content of bio-marine fuels is essential for efficient fuel management onboard ships with respect to:

  • Fuel consumption
  • Voyage planning
  • Operating cost
  • Machineries or equipment performance
  • Emission & environmental implications

Why accurate testing of Energy Content is an essential test parameter for Bio-marine fuel

Marine fuel containing FAME typically has lower energy content compared to conventional marine fuels.

The heating value of a fuel is the total energy released as heat when a fuel undergoes complete combustion with oxygen under standard conditions. The chemical reaction is typically a hydrocarbon reacting with oxygen to form carbon dioxide, water and heat as shown in the equation below:

Hydrocarbon + Oxygen à Carbon Dioxide + Water + Heat Released

Conventionally, NSE of marine fuels (which consist of predominantly hydrocarbons from petroleum sources) is calculated using a formula specified in Annex of ISO 8217 (Annex J of ISO 8217:2024) with acceptable accuracy. For marine fuels containing FAME, the NSE cannot be calculated using the formula specified in Annex J of ISO 8217:2024 and shall be measured using ASTM D240 method. FAME molecules contain the Carbonyl group and Ester bonds as shown in Figure 1 below and do not consist purely of carbon and hydrogen atoms.

Figure 1: An Ester of a Carboxylic Acid

Figure 1: An Ester of a Carboxylic Acid

The density of potential energy of a hydrocarbon is determined by the number of carbon to hydrogen bonds that can be replaced by oxygen to carbon (CO2) and oxygen to hydrogen bonds (H2O), in other words, the amount of energy released is dependent on the oxidation state of the carbons in the hydrocarbon. For marine fuel containing FAME, the FAME molecule itself contains oxygen atoms in the Carbonyl group and Ester bond. The Ester group of FAME has a carbon forming 3 bonds with oxygen atoms, this means esters are more oxidised than hydrocarbons and esters release less energy content when compared to hydrocarbon since higher oxidation reactions are needed for hydrocarbons.

The paragraphs above explain the reasons marine fuel containing FAME typically have lower energy content compared to conventional marine fuels, which consist of predominantly hydrocarbons and the calculated formula for NSE is not applicable to marine fuel containing FAME.

According to ASTM D240 test method, heat of combustion is determined by burning a weighed sample in an oxygen bomb calorimeter under controlled conditions. The heat of combustion is computed from temperature observations before, during, and after combustion, with proper allowance for thermochemical and heat transfer corrections. The average of gross specific energy (GSE) or gross heat of combustion, and NSE or net heat of combustion of MGO, VLSFO, HSFO and Bio-marine Fuels are tabulated in Table 1 below:

Why accurate testing of Energy Content (Net Heat of Combustion) is essential for Bio-Marine Fuels

Note: The average GSE and NSE for each of the fuel types was obtained from at least 50 samples.

Based on Table 1, bio-marine fuel B30 has 8% lower energy content when compared to MGO. The energy content of bio-marine fuel will become lower when the FAME content is higher.

Energy content of marine fuel containing FAME shall be determined by ASTM D240 method and cannot be calculated using the current NSE formula, which is commonly used for the conventional marine fuels.

Note: The full article by CTI-Maritec can be found here

 

Photo credit: Louis Reed from Unsplash
Published: 9 January, 2025

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Bunker Fuel Quality

Report: Integr8 warns changes in VLSFO bunker fuel blends could trigger ‘problematic fuels’ wave

Firm said its new report shows that over 45% of global VLSFO supply would not meet RM380 2024 requirements of ISO 8217:2024 specification without adjustments to blend recipes and the changes could lead to a spike in ‘problematic fuels.’

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Report: Integr8 warns changes in VLSFO bunker fuel blends could trigger problematic fuels wave

The introduction of the ISO 8217:2024 specification has brought renewed focus on viscosity limits, with a significant proportion of VLSFOs currently failing to meet the updated standards, according to Integr8 Fuels on Tuesday (14 January). 

This was based on the firm’s latest Bunker Quality Trends report, offering insights into the evolving landscape of marine fuels. Drawing on comprehensive data from over 130 million metric tons (mt) of deliveries, the report provides an in-depth analysis of critical quality issues, regulatory implications, and market trends.

“Data from the report shows that over 45% of global VLSFO supply would not meet the RM380 2024 specification without adjustments to blend recipes,” it said.

“These changes could lead to a spike in problematic fuels, as was observed during the IMO 2020 transition, potentially affecting fuel stability and other critical parameters.”

Regions like Singapore and Houston are flagged as hotspots for adjustments, with over two-thirds of VLSFO in Singapore requiring reformulation. 

“Buyers are urged to adapt charterparty wording to ensure suppliers comply with the latest standards to reduce the risk of critical handling issues,” Integr8 Fuels said.

Other key developments highlighted in the report are:

The Smart Way to Meet Compliance Targets: Plan Biofuel Bunkering on a Fleet or Pool Level

When it comes to compliance with environmental regulations, FuelEU Maritime doesn’t specify a fixed biofuel percentage. The focus is on reducing the greenhouse gas (GHG) intensity across a vessel’s voyages over the course of a calendar year. The target is a 2% reduction in GHG intensity between two EU ports, which translates to around 3% biofuel blended with VLSFO or HSFO, or 2% biofuel with MGO. 

However, it’s more efficient to take larger biofuel quantities on select vessels and transfer compliance surpluses across your fleet or between ships in multiple fleets, which is also known as pooling. The most common biofuel grades stocked by suppliers are B24 and B30 blends, and pure B100. Their availability varies by port and region. Shipowners are advised to carefully manage their biofuel strategies and check the GHG intensity figures in Proof of Sustainability documents provided by suppliers.

Barge Bottlenecks: The Sulphur Compliance Challenge in Southern Europe

Sulphur compliance for VLSFO remains a pressing concern, with 2.4% of supplies exceeding the 95% confidence limits for ISO 8217 Table 2 parameters in the past six months. Geographical variances are significant, with higher non-compliance risks reported in bunker hubs such as Rotterdam and Balboa compared to Singapore. Infrastructure constraints, including the practice of switching between HSFO and VLSFO on the same barges, are identified as contributing factors. The report underscores the importance of data- driven procurement and robust supplier practices to mitigate these risks.

Rising Automotive Fuel Blends Are Driving Flash Point Risks in the Med

The integration of automotive diesel into bunkering pools has led to heightened risks of flash point non-compliance, particularly in the Mediterranean. Automotive fuels often have a minimum flash point of 55°C, below the 60°C threshold mandated for marine fuels under SOLAS regulations. The report identifies specific ports where these risks are most prevalent and calls for enhanced due diligence when purchasing in regions reliant on automotive diesel imports. Ensuring DMA specifications are met is critical to avoiding costly compliance breaches.

Biofuels and LNG: Key Players in the Future of Fuel Compliance

The report highlights the growing role of biofuels and LNG as transitional solutions for meeting stringent emissions regulations, such as FuelEU Maritime and the upcoming Mediterranean Emission Control Area (Med ECA). While LNG remains a reliable option due to its consistent quality and negligible SOx emissions, biofuels are gaining momentum as suppliers expand blending capabilities globally. 

The report cautions buyers about potential operational risks, such as biofuel-related cold flow challenges in colder climates and the limited availability of LNG bunker vessels. The introduction of the Med ECA from 1 May 2025 will likely boost LNG bunker demand in the region, however, the delivery of LNG bunker vessels is failing to keep up with growing demand, tightening the LNG supply chain.

Note: The full Bunker Quality Trends Report Q1 2025 by Integr8 can be found here.

 

Photo credit: Integr8 Fuels
Published: 15 January, 2025

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Bunker Fuel

China: Zhoushan Port achieves 7.26 million mt annual bunker volume for 2024

Zhoushan Hi-Tech Zone Administrative Committee highlighted the progress Zhoushan Port has made in the past year including actively planning to build an alternative fuel bunkering centre.

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China: Zhoushan Port achieves 7.26 million mt annual bunker volume for 2024

Zhoushan Hi-Tech Zone Administrative Committee on Friday (10 January) said Zhoushan, the fourth largest bunkering port of the world, delivered 7.26 million metric tonnes (mt) of marine fuel in 2024.

This marked about a 3% increase from 7.04 million mt in 2023. 

The committee also highlighted the progress Zhoushan Port has made in the past year including actively planning to build an alternative fuel bunkering centre.

It has successfully obtained approval for the national biodiesel promotion and application pilot project. The construction of a project to produce an annual 1 million mt of marine biodiesel has begun.

The first methanol vehicle-to-ship pilot was carried out, and the first methanol bunkering barge in Zhoushan was officially built and is expected to be put into use by the end of 2025.

The port has also improved the fuel supply efficiency of various bunkering anchorages in Zhoushan including Tiaozhumen Anchorage adding three bunkering anchorages on top of the original five and has successfully carried out night bunkering operations. 

Xiushandong and Mazhi anchorages have added a total of three new bonded bunkering anchorages, which can implement all-weather and fully automatic anchorage reservations, and provide advance reservations and priority refueling services for large ships and large orders.

The committee also highlighted Dong Fang Zhao Yang becoming the first domestic bunkering barge to obtain the mass flow meter system certification under the ISO22192:2021 standard. The barge conducted a successful pilot for the bunkering of bonded fuel oil using a mass flow meter at Xiushandong Anchorage on 9 December. 

A spokesperson of the committee said Zhoushan will focus on promoting alternative bunker fuels such as biofuel and LNG and accelerating the completion of methanol refuelling safety assessments.

Related: IPEC 2024: Zhoushan port records 7.04 million mt annual bunker volume for 2023
Related: China: Zhoushan Port launches night bunkering ops in Tiaozhoumen outer anchorage
Related: China: Zhoushan shortlisted for national pilot project to promote biodiesel bunker fuel
Related: China: Zhoushan completes pilot bonded bunkering op with mass flow meter

Photo credit: Zhoushan Hi-Tech Zone Administrative Committee
Published: 14 January, 2025

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Biofuel

UECC wraps up first truck-to-ship bio-LNG bunkering operation in Spain

Liquefied biomethane supplied by green energy developer Naturgy was pumped directly from a tanker truck into the tanks of UECC’s multi-fuel LNG battery hybrid PCTC “Auto Advance”.

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UECC wraps up first truck-to-ship bio-LNG bunkering operation in Spain

United European Car Carriers (UECC) on Monday (13 January) said it has performed the first-ever ship bunkering operation in Spain with a truck-borne shipment of liquefied biomethane (LBM), also known as bio-LNG, to widen access to supplies of the sustainable fuel.

In the milestone event at the Port of Vigo, LBM supplied by green energy developer Naturgy from a biomethane production plant in the surrounding Galicia province was pumped directly from a tanker truck into the tanks of UECC’s multi-fuel LNG battery hybrid Pure Car and Truck Carrier, Auto Advance.

“This is an important step as it is the first time LBM has been delivered by truck to ship in the whole of Spain. We view Spain as a promising market for biomethane production and so it’s great to get this first delivery over the line,” said UECC’s Energy & Sustainability Manager Daniel Gent.

The delivery allows the leading sustainable carrier in the European shortsea RoRo trade to diversify its regional sources of supply for LBM beyond its main hub of Zeebrugge where it has a long-term supply agreement in place with Titan Clean Fuels

“We are trying to promote the growth of the wider small-scale LBM supply network,” Gent explained.

Another aspect of this diversification is that it also represents the first physical molecule delivery of the fuel - instead of mass balanced - as UECC explores multiple alternative delivery pathways to broaden its LBM portfolio.

UECC is boosting uptake of the fuel in line with expansion of its Sail for Change sustainability initiative launched last summer in which LBM is being bunkered on the company’s five dual and multi-fuel LNG PCTCs for several major vehicle manufacturers to cut their Scope 3 emissions.

As well as contributing to its customers’ decarbonisation efforts, UECC is providing fuel demand to support renewable energy development by Naturgy, which is involved in numerous innovative projects to convert agricultural and livestock waste into biomethane, strengthening the regional circular economy.

Naturgy, in a joint venture with Reganosa and Repsol, is looking to produce 1 terawatt hours per year of biomethane from treatment of animal slurry and other waste sources, which would cover 7% of Galicia’s annual gas import requirements and result in a reduction of 500,000 tonnes of CO2 per year.

Gent added: “We hope the LBM truck delivery in Spain will be the first of many.”

Related: JLR joins UECC bio-LNG initiative to decarbonise maritime transport
Related: Titan to supply biomethane bunker fuel to UECC multi-fuel ships with new deal
Related: UECC and Titan team up on bio-LNG bunkering operations in Port of Zeebrugge

 

Photo credit: United European Car Carriers
Published: 14 January, 2025

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