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DNV Decarbonization Insight Series August 2026 - What maritime professionals should know about AI Training

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Scrubbers: A mature platform for asset futureproofing

Embracing proven technology that can bridge the gap between current and future environmental regulations will enable the industry to move forward confidently, says Scott Oh of Wärtsilä Exhaust Treatment.

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Scott Oh, Director, Asia Operations at Wärtsilä Exhaust Treatment, recently shared with Singapore bunkering publication Manifold Times on their success in the current market for scrubbers and recent scrubber sales in Asia as well as elaborates on its CCS-Ready 35MW scrubber:

With the wide and relatively stable spread between high and low sulphur fuels, scrubbers continue to present a favourable economic proposition, and payback time has now reached less than two years for several vessel types. 

These technologies’ role in Global Sulphur Cap compliance is well known. But, today, beyond solely tackling SOx, scrubbers have become a platform from which multiple technologies can work together in the stack and throughout the exhaust chain. This includes tackling NOx emissions by adding selective catalytic reduction systems (SCR) or exhaust gas recirculation systems (EGR) to ensure compliance with MARPOL Tier III requirements. In addition, scrubbers can reduce Particulate Matter (PM) 2.5 levels below even standard land-based requirements and a filter can be applied to capture microplastics. 

Finally, and most importantly, scrubbers can now also be installed in a way that sees them primed and ready for onboard CO2 capture and storage (CCS), making them a futureproofed investment for achieving marine decarbonisation goals in a short timeframe. This has been particularly recognised in Asia and by Asian shipowners, because it is here where Wärtsilä received its first order for CCS-Ready scrubbers in November 2022. This landmark order includes systems for four 8,200 TEU container vessels which will be fitted with Wärtsilä’s CCS-Ready 35MW scrubber in an open loop configuration. 

At its core, CCS-Ready means that Wärtsilä is conducting the requisite engineering and naval architecture at the outset to ensure adequate space for the future installation of a CCS system, as well as incorporating considerations for minimising idle load and optimising utilities, and preparing the control and automation system. 

Owners are looking to future-proof their existing fleet and newbuildings while the regulatory environment is still evolving and at a time when yard space is in high demand. Concurrently, they are taking advantage of higher charter rates, particularly in the container ship market, so for retrofits, minimising off-hire time is critical. They need a partner that has the ability, relationships and experience to cooperate with yards and manage the process from sales to installation. 

A first 2D layout drawing provides owners with an understanding of the scope of the installation and enables onboard space to be reserved. A full technical feasibility study can then be undertaken before or after contract signing. Owners typically make most decisions within the first four weeks after contract signing. This is when the equipment, piping and possible tanks are modelled, and owners may consider their preferences, such as tank locations, to ensure the design process is straightforward.

This phase also includes considerations on how best to futureproof the installation, leaving room for adaptation to CCS or hybrid functionality. The work required to allow for a CCS add-on is mainly done on the drawings at this stage, but some modifications can be made to the scrubber body. Space will need to be reserved above the scrubber and the funnel may need raising a few metres. In some cases, it makes sense to do this as early as possible.

Shipyard involvement is critical. Generally, shipyards should take the input of suppliers and ‘own’ the detailed designs themselves, ensuring a smooth and fast process that avoids confusion during installation. Co-operation between the basic and detailed designer remains important, and a good scrubber manufacturer will act as a link between all parties. In some cases, it is personal relationships and prudent communication skills more than the contract that can ensure positive, timely outcomes.

Wärtsilä has a strong presence in the Asian scrubber market after receiving Type Approval from the China Classification Society (CCS) in 2020. This was achieved when Dalian Shipbuilding Industry ordered a scrubber for the New Treasure, a newbuild VLCC. The vessel was built for Associated Maritime of Hong Kong, part of the China Merchants Energy Shipping (CMES) group, the largest VLCC owner in China.

Owners’ confidence in scrubbers as a technology platform for compliance with IMO goals and the wider decarbonisation picture has increased with advanced scrubber solutions, and by choosing the right partners, they can be confident they will overcome the engineering challenges and remain competitive. 

 

Photo credit: Wärtsilä
Published: 3 August, 2023

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Legal

Singapore police arrest eight over alleged illegal MGO transaction off Tuas

SPF says preliminary investigations found that crew members of a Singapore-registered tugboat misappropriated MGO worth about SGD 10,570 without their company’s knowledge and sold it illegally.

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Singapore police arrest eight over alleged illegal MGO transaction off Tuas

The Singapore Police Force (SPF) on Thursday (13 August) said it has arrested eight men, aged between 25 and 54, for their suspected involvement in an illegal transaction of Marine Gas Oil (MGO).

On 13 August 2026 at about 1.05am, officers from the Police Coast Guard (PCG) conducted a check on a Singapore-registered tugboat in the waters off Tuas and discovered that eight crew members were possibly involved in the illegal transaction of MGO. 

“Preliminary investigations revealed that the crew members of the tugboats misappropriated MGO valued at about SGD 10,570 (USD 8,258), without their company’s knowledge,” SPF said in a statement.

“The MGO was sold illegally for their personal financial gain.”

The eight crew members will be charged in court on 14 August 2026 with the offence of theft by servant of property in possession of master under Section 381 of the Penal Code 1871 If convicted, they shall be punished with an imprisonment term that may extend to seven years and shall also be liable to fine.

“The Police take a serious view of illegal transaction of MGO in Singapore Territorial Waters and will continue to conduct enforcement and security checks to prevent, deter and detect such illicit activities in Singapore waters,” SPF added. 

 

Photo credit: Singapore Police Force
Published: 14 August, 2026

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Port & Regulatory

Gard: Sulphur-related bunker claims rise amid tighter China MSA enforcement

Claims involving excessive sulphur content in marine fuels have been rising, while stricter inspections by the China MSA have heightened the focus on sulphur compliance, particularly in the Bohai Sea.

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shraga kopstein on Unsplash

Maritime protection and indemnity (P&I) club Gard on Wednesday (12 August) highlighted that claims involving excessive sulphur content in marine fuels have been rising, while stricter inspections by the China MSA have heightened the focus on sulphur compliance, particularly in the Bohai Sea:

Rise in off-spec sulphur claims

Recent claims experience indicates that bunker quality continues to pose a significant operational risk for shipowners. In our earlier review of bunker-related claims during the first five months of 2026, we highlighted a rise in off-specification bunker incidents amid increased pressure on global fuel supply chains following the escalation of the conflict in the Middle East. 

Specifically for Sulphur compliance, between January and June 2026, the number of sulphur-related cases increased by more than threefold compared with the same period in 2025. Notably, the number of cases recorded in the first six months of this year has already exceeded the total number reported during the whole of last year by approximately 40%. 

While each case is fact-specific, the increase is notable because excessive sulphur content constitutes a MARPOL compliance issue. Unlike many other bunker quality problems, sulphur non-compliance identified through port state inspections can result in vessel delays, enforcement action, and substantial costs associated with debunkering and fuel disposal. 

The map below illustrates the geographical distribution of sulphur-related claims recorded during the first six months of 2026, based on the location where the bunkers were stemmed.

Distribution of sulphur related claims

China MSA steps up sulphur compliance enforcement

According to our correspondent, Huatai, on 5 June 2026, the maritime authorities of Tianjin, Hebei, Liaoning and Shandong jointly launched a special campaign on ship pollution prevention and control in the Bohai Sea region. The campaign involves coordinated supervision by local MSA branches across the region and is expected to last nearly five months. It covers major ports and surrounding port areas in the Bohai Sea region, including Tianjin, Tangshan, Qinhuangdao, Huanghua, Jinzhou, Yingkou and Longkou. 

While the initiative is broader than bunker sulphur compliance alone, its scope includes inspections relating to air pollution prevention, SOx emissions, fuel compliance and other high-pollution-risk operations. Enforcement measures are expected to comprise onboard inspections, cross-regional enforcement activities, unannounced spot checks and remote monitoring. These efforts will be supported by a combination of UAV patrols, maritime patrol vessels, shore-based monitoring systems and rapid on-site fuel testing. 

As a result, vessels trading in the Bohai Sea region may experience increased scrutiny of fuel compliance documentation, fuel sampling records, onboard fuel management procedures, and the handling or disposal of suspected non-compliant fuel.

Documents typically requested by China MSA

Based on our recent experience, including the case discussed above, and subject to the specific requirements of the local MSA office, owners and operators may be requested to provide supporting documentation such as: 

  • Bunker documentation – Bunker Delivery Notes (BDNs), MARPOL fuel sample records, fuel test reports, and relevant fuel quality certificates. 
  • Statutory certificates – including the International Air Pollution Prevention (IAPP) Certificate and International Oil Pollution Prevention (IOPP) Certificate. 
  • Operational records – engine logbooks, deck and navigation logbooks, Oil Record Book entries, and records relating to fuel transfers, storage and consumption. 
  • Sampling documentation – the Master’s statement and any records demonstrating how fuel samples were drawn, sealed, labelled, handled and retained. 
  • Correspondence records – communications with the authorities, bunker suppliers, charterers and other relevant stakeholders. 
  • Fuel disposal records – approved disposal plans, debunkering documentation, receipts and evidence of final disposal, where applicable. 

The exact documentation required will depend on the nature of the investigation, the findings of the inspection, and the requirements of the local enforcement authority. 

Possible regulatory consequences in China

Under the Air Pollution Prevention and Control Law of the People’s Republic of China, ocean-going vessels are required to use fuel oil meeting atmospheric pollutant control requirements after berthing. Vessels operating within designated emission control areas must also comply with applicable emission standards. Article 106 provides that where vessel fuel oil fails to meet applicable standards or requirements, the competent maritime authorities may impose fines ranging from RMB 10,000 to RMB 100,000. Liability may extend to shipowners, ship operators and ship managers depending upon the circumstances of the case. 

Recommendation

Sulphur compliance should be treated as both a fuel quality and regulatory risk. Owners and operators are encouraged to take preventive steps before bunkering, act promptly if non-compliant fuel is suspected, and preserve evidence carefully if an inspection or claim arises. Under amended 

Resolution A.1206(34), Appendix 18, 2.1.5, if the BDN shows compliant fuel, but the master has independent test results of the fuel oil sample taken by the ship during the bunkering which indicates non-compliance, the master may document this by notifying the ship’s flag Administration, with copies to: 

  • the competent authority of the relevant port of destination, 
  • the Administration under whose jurisdiction the bunker deliverer is located, 
  • and to the bunker deliverer.

 

Photo credit: shraga kopstein on Unsplash / Gard
Published: 14 August, 2026

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LNG Bunkering

Shell expands LNG bunkering footprint in Spain with Valencia

As one of the region’s key maritime hubs, the company said Valencia expands the options available to shipowners seeking LNG supply along major shipping routes.

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Shell expands LNG bunkering footprint in Spain with Valencia

British oil giant Shell on Thursday (13 August) said Valencia has joined its growing network of bunkering locations, making LNG available as a marine fuel.

The successful completion of the first LNG bunkering operation in Valencia marked an important milestone for Spain and further strengthened Shell’s LNG supply capabilities across the Mediterranean. 

In a video shared by the company, bunkering vessel Alice Consulich was shown supplying an undisclosed volume of LNG to the container ship MSC Sabrina.

“As one of the region’s key maritime hubs, Valencia expands the options available to shipowners seeking LNG supply along major shipping routes,” Shell said in a social media post. 

Shell said the achievement reflected the strong collaboration across the maritime value chain, including MSC Mediterranean Shipping Company, the Port of Valencia and Fratelli Cosulich Group.

“We look forward to making more LNG bunker deliveries in Valencia and across the Mediterranean as LNG infrastructure and capabilities continue to expand,” the company said. 

 

Photo credit: Shell
Published: 14 August, 2026

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