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USCG outlines how it will enforce MARPOL Annex VI NOx Tier III

Issues Work Instructions to certify ‘qualifying engines’ for earlier vessels, writes legal firm Blank Rome.

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American law firm Blank Rome in November issued an update on how owners may seek authorisation from the U.S. Coast Guard to operate engines that do not meet MARPOL Annex VI NOx Tier III requirements:

The International Maritime Organization (“IMO”), in preparing for the global 0.5 percent fuel oil sulfur limit, recently adopted an amendment to MARPOL Annex VI to support consistent implementation and enforcement of the new requirement. At the same time, the IMO rejected a proposal for an "experience building phase" during the first months of implementation. This put to rest any rumors of a delay in implementation. Meanwhile, the U.S. Coast Guard published procedures by which owners may seek authorization to operate engines that do not meet MARPOL Annex VI NOx Tier III requirements for qualified vessels.

New Developments

The IMO adopted an amendment to support consistent implementation of the forthcoming 0.5 percent limit on sulfur in ships fuel oil on October 26, 2018, during the recent session of its Marine Environment Protection Committee (“MEPC 73”). This amendment, effective on March 1, 2020, prohibits the carriage of non-compliant fuel oil for use on the vessel unless the vessel is outfitted with an exhaust gas cleaning system, often referred to as a scrubber. The amendment does not alter the January 1, 2020 implementation date for the 0.5 percent sulfur limit.

Also related to MARPOL Annex VI, the U.S. Coast Guard published an enforcement Work Instruction formally addressing how the U.S. Coast Guard will enforce the Annex VI nitrogen oxides (“NOx”) Tier III standards within the North American and U.S. Caribbean Sea Emission Control Areas (“ECAs”). See Exercise of Enforcement Discretion with Regard to MARPOL Annex VI Regulation 13.5.1.2; CVC-WI-014(1) (October 17, 2018). Because engines meeting the NOx Tier III standards were largely unavailable after the Tier III standards took effect in 2016, the U.S. Coast Guard is allowing impacted vessels to instead be certified as meeting U.S. Environmental Protection Agency (“EPA”) Clean Air Act Tier 3 requirements pursuant to 40 C.F.R. Part 1042. Once individually recognized by the U.S. Coast Guard, such engines may be used indefinitely, even after NOx Tier III compliant engines become available.

Background

Vessels subject to MARPOL Annex VI are required to comply with sulfur and NOx emissions standards, among others, while operating worldwide. On January 1, 2020, the current 3.5 percent maximum fuel oil sulfur limit for operations outside of the four ECAs will be reduced to 0.5 percent. The current 0.1 percent sulfur limit for operations within the ECAs will remain the same. As there generally will no longer be a valid reason to carry fuel oil for vessel use with a sulfur content above 0.5 percent after January 1, 2020, the IMO amendment prohibits such carriage unless the vessel is outfitted with scrubbers, which offers an alternative means of compliance with the sulfur emissions standards.

The Annex VI NOx Tier III emission standard went into effect within the North American and U.S. Caribbean Sea ECAs on January 1, 2016. However, engines meeting the NOx Tier III standard were largely unavailable at the time and remain elusive for some engine sizes. It is expected that compliant engines will be available for all engine needs by 2021, when the NOx Tier III standard goes into effect in the Baltic and North Sea NOx ECAs. To address the gap period during which Annex VI compliant engines were not available, the U.S. Coast Guard’s Work Instruction provides a method by which an application can be made for Clean Air Act compliant engines to formally become “qualifying engines” and be able to operate within the North American and U.S. Caribbean Sea ECAs without risk of Annex VI enforcement action.

Analysis

Support and Guidance for Global 0.5 Percent Fuel Oil Sulfur Limit

The Annex VI amendment prohibiting the carriage of non-compliant fuel oil for use on the vessel unless the vessel is outfitted with scrubbers supports implementation of the 0.5 percent global fuel oil sulfur limit going into effect on January 1, 2020. The amendment goes into effect on March 1, 2020, and does not impact the implementation of the 0.5 percent sulfur limit, which goes into effect on January 1, 2020.

Some industry sectors proposed an “experience building phase” in the early months of implementation, fearing fuel quality issues, inadequate supply of 0.5 percent fuel, higher transportation costs, and aggressive enforcement. This proposal supported the January 1, 2020 implementation date, but called for a “pragmatic enforcement approach” that recognizes that there will be a deficit in sulfur compliant fuels, which will be further exacerbated by quality issues anticipated with new low sulfur blends on the market. The proposed data collection, analysis, and review phase would also encourage consistent treatment of vessels unable to achieve compliance due to non-availability of compliant fuel or compatibility issues. The IMO turned down the proposal for an “experience building phase,” but called for more detailed proposals for the next MEPC meeting in May 2019. The IMO further urged all Parties to Annex VI to inform the IMO of anticipated availability issues well in advance of the January 1, 2020 implementation date.

However, counter to these fears, others have made the point that planning and preparations are well under way with substantial investments being made by industry stakeholder to meet the 2020 deadline. To change the rules now could have created an economic disadvantage to those who invested early.

In addition, to assist ship owners and operators in planning for the 0.5 percent sulfur limit, the IMO is developing guidelines addressing topics, such as impact of new fuels, system modifications, tank cleaning, fuel oil procurement, fuel oil changeover planning, and documentation. Further, the IMO’s Guidance on Best Practice for Fuel Oil Suppliers, published earlier this year, remains a helpful resource for fuel oil suppliers and purchasers in helping to assure the quality of fuel oil throughout the purchase and loading process.

U.S. Coast Guard Authorization for Engines Not Meeting Annex VI NOx Tier III Standards

In short, the U.S. Coast Guard’s Work Instruction outlines how the U.S. Coast Guard will enforce MARPOL Annex VI due to the unavailability of engines needed to comply with this regulation. It addresses both U.S.- and foreign-flag vessels that were constructed or underwent a major conversion in 2016 or later and are thus subject to the Annex VI NOx Tier III standard when operating in the North American and U.S. Caribbean Sea ECAs. If there were no NOx Tier III engines available at the time of construction, such vessels will be allowed to operate engines within these ECAs without risk of U.S. Coast Guard enforcement action if the engines otherwise meet EPA requirements pursuant to 40 C.F.R. Part 1042. The U.S. Coast Guard has identified the following categories of vessels and engines that qualify for authorization under the Work Instruction:
 

Engine Size Keel-Laying Date Alternative Standard
130–600 kW On or after January 1, 2016 Clean Air Act Tier 3
600–1000 kW On or after January 1, 2016,
and before October 1, 2017
Clean Air Act Tier 3
1000–1400 kW On or after January 1, 2016,
and before January 1, 2017
Clean Air Act Tier 3

Any vessel intending to be covered under the Work Instruction must apply and have each engine individually recognized by the U.S. Coast Guard. Once deemed “qualifying engines,” they will retain that status indefinitely, even after MARPOL compliant engines become available. For new U.S.-flag constructions, written requests for engine authorization should be included in the vessel’s Application for Inspection of U.S. Vessel. For all existing U.S. vessels and foreign-flag vessels that may qualify for enforcement discretion, vessel owners should submit a written request as soon as possible.

Conclusion

Vessel owners and operators should continue to plan and prepare for implementation of the global 0.5 percent fuel oil sulfur limit as additional changes or delays are unlikely. In addition, owners and operators of vessels qualifying for enforcement discretion from Annex VI Tier III requirements pursuant to the U.S. Coast Guard’s Work Instruction should apply for authorization as soon as possible to avoid non-compliance and enforcement risks.

Source: Blank Rome
Published: 26 November, 2018

 

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Ammonia

AM Green plans to build green ammonia plant at Indian port

Initiative also includes development of green ammonia handling, storage and bunkering infrastructure, pilot bunkering operations, safety procedures and training programmes, says VOC Port Authority.

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VO Chidambaranar (VOC) Port Authority on Friday (29 May) said it has signed a Memorandum of Understanding (MoU) with India’s ammonia producer AM Green Ammonia to collaborate in the development of a green ammonia production plant.

The plant will have a capacity of one million tonnes per annum (MTPA) at Tuticorin.

The initiative also includes development of green ammonia handling, storage and bunkering infrastructure, pilot bunkering operations, safety procedures and training programmes. 

The project is expected to support the development of green fuel corridors connecting VOC Port with major ports in Europe and Asia, thereby strengthening India’s position in the global green fuels value chain.

VOC Port also signed a Memorandum of Understanding (MoU) with Bureau Veritas (India) Pvt. Ltd., to collaborate on Green Port certification, emissions accounting, ESG reporting, safety validation, development of green bunkering practices, and establishment of a Centre of Excellence for green fuels and sustainability.

The port also plans for an upcoming 750 m³ green methanol bunkering facility.

 

Photo credit: Naveed Ahmed on Unsplash
Published: 3 June, 2026

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Port & Regulatory

Study: Major drop in ship sulphur emissions confirmed following IMO regulations

National Centre for Atmospheric Science study found that the average sulphur content in ship fuel dropped nearly tenfold in open ocean areas following IMO’s 2020 regulation.

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Recent global regulations have significantly reduced sulphur emissions from ships, helping to improve air quality in coastal regions – confirmed by a recent international study led by researchers at the National Centre for Atmospheric Science. 

The research, published in Environmental Science: Atmospheres, used aircraft and ground-based instruments to measure sulphur dioxide and nitrogen oxides emitted by ships in the North-East Atlantic and European coastal waters between 2019 and 2023.

The team found that the average sulphur content in ship fuel dropped nearly tenfold in open ocean areas following the International Maritime Organization’s 2020 regulation, which capped sulphur content in marine fuel at 0.5%. 

Before the change, many ships exceeded the previous 3.5% limit. After 2020, only a small number of ships were found to breach the new standard.

In European sulphur Emission Control Areas (SECAs), such as the English Channel and the Port of Tyne, sulphur levels were even lower – well below the stricter 0.1% limit. Interestingly, ports outside these zones, like Valencia in Spain, also showed low sulphur levels, likely due to EU rules requiring cleaner fuel when ships are docked for extended periods.

This is the first study to use aircraft-based measurements and predictions from the Ship Traffic Emission Assessment Model (STEAM3) to assess ship emissions outside of sulphur control zones since the 2020 regulation came into effect. The findings support the widely held view that ships now emit around seven times less sulphur than before the rule change – an important step toward cleaner air and healthier coastal environments.

Note: The research, titled ‘SO2 and NOx emissions from ships in North-East Atlantic waters: in situ measurements and comparison with an emission model’ can be found here. 

 

Photo credit: shraga kopstein on Unsplash
Published: 8 December, 2025

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Interview

IBIA Annual Convention 2025: ‘Exciting times’ for post IMO 2020 bunker suppliers, states Equatorial

Choong Sheen Mao, Chief Operating Officer, Equatorial, describes to Manifold Times the pre/post IMO 2020 challenges and evolution of bunker suppliers.

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The International Bunkering Industry Association (IBIA) will be hosting its flagship Annual Convention in Hong Kong at the Hong Kong Convention Exhibition & Convention Centre between 18 to 20 November 2025, as part of Hong Kong Maritime Week.

Choong Sheen Mao, Chief Operating Officer, Equatorial Marine Fuel Management Services (Equatorial), speaks to bunkering publication Manifold Times about the challenges of a post IMO 2020 bunker supplier.

MT: How does Equatorial continue to offer customer assurance and maintenance of marine fuel quality to ISO8217 standards despite increasing complexity of bunker fuel blends?

We maintain our focus to provide compliant, quality and competitively priced products to our customers. There is no shortcut. We source our products from a wide range of cargo producers and suppliers. We continue to be strict and vigilant with our testing programme for our products before delivering them to our customers. Equatorial has deepened our engagement with the wider industry to have a better and up-to-date understanding of the existing and new marine fuels.

MT: Can you share the evolution of commercial marine fuel procurement, blending and trading strategies on the back of increasing fuel types (pre/post IMO 2020)?

Pre IMO 2020, the main types of marine fuel procured and consumed by vessels were high-sulphur fuel oil, marine diesel oil and marine gas oil. Trading strategies were therefore closely linked to that within the oil industry.

However, many of the new fuel types are from other industries. For example, biofuels, methanol and ammonia are mainly products from the chemical and agriculture industries. There are marked differences between these industries and the energy industry (in particular, the marine fuels industry). LNG is from the gas industry which is distinct from the oil industry.

Without an existing liquid paper market for many of these commodities (especially as a marine fuel), the price risk management is less straightforward. Furthermore, commodity prices are no longer the sole consideration for price itself. The price of compliance must be considered. This could range from guaranteeing the origin of the marine fuel, its sulphur properties as well as its carbon intensity. The list goes on.

MT: Operational wise, what are the changing role and responsibilities of a bunker supplier to date, compared to before IMO 2020?

The role and responsibility of a bunker supplier have evolved. Fundamentally, it has been about providing quality marine fuels at competitive prices. Quantity assurance has been a critical concern which led to the mandatory implementation of the mass flow meter system for bunkering in the Port of Singapore. Interestingly, due to the nature of credit terms in the bunker industry, bunker suppliers also performed the role of “bankers” by extending favourable credit terms to shipowners and charterers.

These days, post IMO 2020, things have become even more complicated. Today, a bunker supplier retains the abovementioned roles and responsibilities, and much more – it has to ensure compliance with a plethora of rules and regulations. Compliance not only with sulphur cap requirements, but with international and regional sanctions and restrictions unrelated to the quality of the marine fuel itself. In fact, especially with alternative low- and zero-carbon marine fuels, this means compliance with standards, rules and regulations on sustainability such as the European Renewable Energy Directive and/or International Sustainability and Carbon Certification. There is also the need to comply with increasingly stringent safety regulations on both conventional and alternative marine fuels.

In addition to the above, a post IMO 2020 bunker supplier is still expected to supply compliant and quality fuel at competitive prices.

MT: Equatorial is Singapore’s largest local-born supplier; what is the next big thing for the company?

Equatorial continues to adapt and improve with the times, while maintaining its core values – Integrity, Teamwork, Commitment, Proficiency and Quality, and Safety and Environment. The bunker industry is a highly competitive one, and it is our intention to keep our competitive edge and remain relevant. This means that we have had to step out of our comfort zone and embrace the two mega trends of our time – digitalisation and decarbonisation.

We have been early adopters and developers of the electronic bunkering note as part of our own digital bunkering efforts. We have diversified our product offering to include low carbon marine fuels and are proud to be one of the pioneers for bunkering B100 biofuels earlier this year. This was made possible by the arrival of our IMO Type II chemical and oil bunker tankers. These same bunker tankers are also capable for carrying and delivering methanol. Equatorial has invested in an LNG bunkering vessel (LBV) newbuilding that is set to be delivered in Q3 2027. We are also involved in a study to develop low- or zero-carbon ammonia bunkering in Singapore.

These are exciting times.

Note: Choong Sheen Mao is amongst panellists featured in ‘Session Three: Bunker Sellers Panel’ at the IBIA Annual Convention 2025.

Join the Conversation

With over 300 delegates expected, the IBIA Annual Convention 2025 is set to be a defining moment for the marine fuels industry. Registration is now open via the IBIA Annual Convention website.

 

Photo credit: Manifold Times
Published: 31 October 2025

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