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Innospec: Slow steaming offers economic and environmental rewards, but not without sacrifices

While slow steaming may help save fuel cost and lowers emissions, it may end up being a costly endeavour for ship owners. Innospec suggests looking at smart slow steaming instead, shares Nicea Ng.

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Slow steaming is often considered the easiest solution for overcoming both economic and environmental challenges.

However, doing so without risking the safety and long term efficiency of ships needs careful consideration by ship owners and operators, shares Nicea Ng, Marine Technical Specialist, Innospec Limited.

“Every vessel has an optimum engine load where the combustion is almost complete and the SFOC (Specific Fuel Oil Consumption) is at minimum level,” states Ng.

“When an engine is running on a low load condition, the cylinder pressure and temperatures are lower which leads to poorer ignition and incomplete combustion of bunker fuel.

“Though reducing speed offers a better CII rating; this may also lead to energy and combustion efficiency losses that cause preventable damage to vessel machinery.

“Vessels with high engine output will need costly retrofit solutions with high CAPEX in order to permanently work at lower loads.

“From experience, slow steaming usually results in a variety of negative effect on vessel engines.”

Adverse effects of slow steaming on ship engines

Poor Atomisation

Higher volume of fuel trapped at the injector tip (sac) delivering uncalculated fuel to the cylinder and increasing the likelihood of dripping. Increased fouling and carbon deposits all contribute to poor atomisation and subsequent drop in performance.

Poor Combustion Characteristics

At reduced ME load operation, inadequate turbo charger speeds are generated to provide adequate air to the combustion chamber, leading to lower combustion efficiency, unburnt fuel and the formation of harmful emissions.

Reduced Air Flow

Reduces engine efficiency and causes fouling in the air supply/scavenge system. Subsequently this can lead to very high differential and exhaust temperatures which can damage engine components and lead to burned exhaust valve as one example.

Cold Corrosion

Corrosive wear on the cylinder liners caused by acid condensation due to the drop in engine operation temperature caused by slow steaming operation.

Fouling Effect

On Turbocharger (turbine side),

  • On Exhaust Gas Boiler (heat exchanger pipes)
  • On Injector (clogged nozzles),
  • On Piston rings (deposit accumulation – lack of sealing)
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T/C Untreated fuel
Picture 2
T/C treated fuel with Octamar

‘Smart slow steaming’ with Octamar™ Ultra HF & Octamar™ Complete – fuel treatment systems with Class Verification

Combustion catalysts have a positive impact on the fuel’s combustion profile by providing a faster and more complete combustion of regular fuel at any load condition.

With a significant reduction in uncaptured fuel energy, vessels have seen 2.1-3.9% fuel savings which have contributed to better CII ratings.

“Even till today, issues with slow steaming have remained the same. However, with new regulations and changes in fuel quality over the years, Innospec continues to improve its technology to optimise today’s marine fuel,” informed Ng.

“Octamar™ Ultra HF & Octamar™ Complete allows vessels to slow steam with associated benefits by minimising the adverse effects listed above while improving fuel consumption and emissions.”

The unique treatment package improves energy efficiency of ships by reducing ignition delay, cleaning injectors, and reducing afterburn to mitigate all the issues associated with slow steaming while decreasing combustion properties and early max heat release to maintain energy efficiency.

Screenshot 2023 05 29 at 12.25.22 PM

“ClassNK has also verified several trials conducted over a decade which demonstrated the active fuel consumption (2.1-3.9%) and emissions reduction of Octamar™ technology,” she highlights adding the Octamar ™ solution can be further included in vessels’ SEEMP III.

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Note: Readers may contact Innospec Limited for more information on Octamar™ Ultra HF & Octamar™ Complete at: [email protected]

Related: Innospec Inc. retains Gold rating from EcoVadis for sustainability performance
Related: ClassNK verifies improved engine performance data of Innospec Octamar™ Combustion Catalyst Series
Related: Innospec Fuel Specialties technical bulletin: Considerations when heating VLSFO and Case Studies
Related: Innospec Fuel Specialties technical bulletin: Why are there no Cold Flow Improvers (CFI) for VLSFO?
Related: Innospec Octamar HF-10 Plus receives ClassNK certification for VLSFO stability performance
Related: Innospec highlights important overview on handling fuel instability issue of VLSFO|
Related: Innospec launches Octamar™ series of additives for new blends of IMO 2020 bunker fuels

Photo credit: Innospec/ Shaah Shahidh on Unsplash
Published: 29 May, 2023

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Alternative Fuels

Yang Ming orders six LNG dual-fuel, ammonia-ready containerships from Hanwha Ocean

Each of the six new vessels will have a capacity of up to 13,650 TEU and feature LNG dual-fuel propulsion and Ammonia Fuel Ready specifications.

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Yang Ming orders six LNG dual-fuel, ammonia-ready containerships from Hanwha Ocean

Taiwanese shipping firm Yang Ming Marine Transport Corporation (Yang Ming) and South Korean shipbuilder Hanwha Ocean on Wednesday (2 September) signed a shipbuilding contract for six 13,000 TEU class LNG dual-fuel container vessels. 

The contract was signed by Dr. Chuck Tsai, Chairman of Yang Ming, and Mr. Charles Kim, CEO of Hanwha Ocean. The vessels are scheduled for delivery between 2028 and 2029. 

They will complement Yang Ming’s existing fleet of 10,000+ TEU vessels and serve as key vessels on East-West services, with deployment flexibility across trade lanes connecting Asia with the East and West Coasts of North America, South America, and the Mediterranean. 

Each of the six new vessels will have a capacity of up to 13,650 TEU and feature LNG dual-fuel propulsion and Ammonia Fuel Ready specifications.

“As Yang Ming transitions toward net-zero emissions, LNG provides a relatively mature and economically viable alternative fuel solution, capable of reducing greenhouse gas emissions by approximately 20%,” the company said. 

“At the same time, ammonia can serve as a carbon-free fuel by utilising converted LNG storage facilities, while offering relatively lower conversion costs and comparatively well-developed supply chains and infrastructure. The Ammonia Fuel Ready design will therefore provide Yang Ming with greater flexibility in responding to increasingly stringent international regulations on greenhouse gas emissions.”

In addition, the vessels will be equipped with Type B LNG fuel tanks with a design pressure of 1.0 bar to enhance the safety and efficiency of LNG operations, together with a range of energy-saving technologies, including Wind Shields, Rudder Bulbs, Pre-Swirl Stators, and Shore Power Systems. Smart ship technologies and cybersecurity protection features will also be incorporated to enhance operational efficiency, safety, and reliability while effectively reducing fuel consumption and greenhouse gas emissions.

Deliveries under Yang Ming’s next-generation fleet optimization plan commenced earlier this year. By 2030, a total of 24 new vessels are expected to enter service. 

This includes 18 LNG dual-fuel vessels—comprising five 15,500 TEU, seven 16,000 TEU, and the six 13,000 TEU vessels under this contract—alongside six 8,000 TEU methanol dual-fuel-ready ships. 

 

Photo credit: Yang Ming Marine Transport
Published: 4 September, 2026

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Alternative Fuels

LR, China’s MARIC unveil tanker concept ready for three future bunker fuels

Both secured AiP for a new 114,000 DWT product and crude oil tanker designed to accommodate future conversion to LNG, methanol or ammonia.

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LR, China’s MARIC unveil tanker concept ready for three future bunker fuels

Lloyd’s Register (LR) and the Marine Design and Research Institute of China (MARIC) on Thursday (3 September) have secured Approval in Principle (AiP) for a new 114,000 DWT product and crude oil tanker designed to accommodate future conversion to LNG, methanol or ammonia.

Announced at SMM 2026, the concept addresses one of the biggest investment challenges facing shipping today: the need to develop vessels and capabilities that can support a range of alternative fuel options and pathways as technologies, infrastructure and regulations evolve.

While LNG is already a mature fuel pathway, methanol and ammonia remain at an earlier stage of development, with questions around global fuel availability, infrastructure development, economics and long-term adoption.

The 114,000 DWT tanker concept has been designed as a product and crude oil carrier that can accommodate future conversion to LNG, methanol or ammonia as technologies, regulations and fuel supply chains mature. By incorporating conversion readiness at the design stage, the concept aims to reduce future retrofit complexity and provide owners with greater confidence when planning long-term fleet investments.

The design concept was reviewed against LR’s July 2026 class rules and regulations, including requirements relating to ships using gases and other low-flashpoint fuels, alongside relevant IACS Common Structural Rules for oil tankers. Final classification and statutory approval remain subject to full compliance with all applicable rules and regulations.

Theo Kourmpelis, Global Business Director for Tankers, Lloyd’s Register, said: “Shipowners are being asked to make major investment decisions today despite continued uncertainty around which fuels will dominate in the decades ahead. Alternative fuel solutions each offer potential pathways to compliance, but fuel infrastructure, regulation and economics continue to evolve at different speeds around the world.

“Designs that preserve flexibility will be critical in helping owners manage risk while preparing for multiple future scenarios.”

Si Nan, Marine & Offshore Marketing Department Vice Director, MARIC, said: “As the industry explores different decarbonisation pathways, shipowners need vessel designs that can adapt alongside technological and regulatory developments. This concept was developed specifically to provide greater fuel flexibility and long-term resilience, allowing owners to respond to changing market requirements without being locked into a single fuel strategy.

“Receiving Approval in Principle from Lloyd’s Register is an important milestone that validates the design concept and supports its future development.”

 

Photo credit: Lloyd’s Register
Published: 4 September, 2026

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Alternative Fuels

DNV: Alternative-fuelled vessel orders hit highest monthly level since October 2024

LNG-fuelled vessels accounted for the vast majority of August activity while the strong summer performance marked a significant acceleration in ordering activity after a relatively slow start to the year.

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DNV: Alternative-fuelled vessel orders hit highest monthly level since October 2024

Latest data from classification society DNV’s Alternative Fuels Insight (AFI) platform alternative-fuelled vessel ordering was strong in August, with 52 new vessels added to the platform.

This is the highest monthly total since October 2024 and follows another active month in July, when 47 vessels were added to the database.

LNG-fuelled vessels accounted for the vast majority of August activity, with 46 orders recorded. The container segment led the way with 30 orders, while the car carrier segment contributed a further 12 LNG-fuelled vessels. In addition, four ethanol-fuelled bulk carriers and two hydrogen-powered bulk carriers were added during the month, as well as one LNG bunker vessel.

The strong summer performance marked a significant acceleration in ordering activity after a relatively slow start to the year. In total, 242 alternative-fuelled vessel orders have been placed in the first eight months of 2026, representing a 27% increase compared with the same period in 2025.

LNG remains the dominant fuel choice, accounting for 63% of all alternative-fuelled vessel orders registered so far this year. Container vessels represent the largest share of these LNG orders (59%), followed by car carriers (30%).

Jason Stefanatos, Global Decarbonization Director at DNV Maritime, said: “The past two months have been particularly strong for alternative-fuelled vessel ordering, with August recording the highest monthly total we’ve seen since October 2024. This has helped lift year-to-date orders to a level well above the same period last year.

“LNG remains the leading fuel choice, driven largely by activity in the container and car carrier segments. These sectors have been among the earliest adopters of alternative fuels, supported by predictable liner operations and increasing demand from cargo owners to reduce emissions across supply chains. 

“For many owners, LNG offers a combination of emissions reductions, fuel availability and future flexibility while the longer-term fuel landscape continues to evolve. 

“At the same time, the latest figures include orders for ethanol- and hydrogen-fuelled vessels, highlighting that owners continue to explore a range of decarbonization pathways. Different segments are making different fuel choices, but the overall level of activity demonstrates continued investment in lower-emission shipping.”

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Photo credit: DNV
Published: 4 September, 2026

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