Carbon Ridge centrifugal OCCS system reaches 98% peak CO2 capture rate in Scorpio Tankers pilot

The Scorpio Tankers pilot marks the first deployment of a centrifugal OCCS system in maritime operations. [Photo: Scorpio Tankers]

Santa Monica, Calif.-based pioneer Carbon Ridge says that an assessment by DNV has confirmed that its centrifugal OCCS (onboard carbon capture system) can reach CO2 capture rates of as high as 98%.

The assessment by DNV used its recommended practice for performance verification of OCCS during the first maritime deployment of a centrifugal OCCS system, which was set up to capture and treat a part of the emissions stream generated by the STI Spiga LR2 product tanker owned by Scorpio Tankers Inc.

The results were reached using data gathered over a scheduled five-month pilot period, which commenced in July 2025 at Besiktas Shipyard in Turkey, on the 109,999 dwt, 2015-built STI Spiga as the vessel undertook regular commercial operations.

DNV reviewed and validated the associated methodologies, calculations, and reported performance metrics and based on the data provided was able to corroborate peak CO2 capture rates of over 98%, with 55% of the observations falling within a range of 86–98%.

“This evaluation under DNV’s recommended practice validates the capability of Carbon Ridge’s modular centrifugal OCCS technology to significantly reduce the emissions of existing and newbuild vessels,” said Chase Dwyer, Carbon Ridge CEO & founder. “The initial data and learnings from the STI Spiga trial further underpin our ambitions to scale Carbon Ridge’s OCCS across the global fleet. This work would not be possible without industry partners like Scorpio Tankers Inc. supporting the deployment of these critical technologies.”

“Independently verified carbon capture rates will be vital to building out a commercially viable business model for OCCS,” said Chara Georgopoulou, head of onboard carbon capture at DNV Maritime. “At DNV we are applying our new OCCS verification Recommended Practice to make sure performance reporting can be accurately and consistently applied across the industry and to help OCCS scale. This has been a great cooperation with Scorpio Tankers and Carbon Ridge, and we look forward to taking the next steps, moving from periodic verification to continuous assurance by using real-time data.”

Scorpio Tankers COO Cameron Mackey said: “We’re pleased that DNV has validated the results of our trial with Carbon Ridge. For any shipowner that foresees higher prices or stricter regulations for carbon, Carbon Ridge’s OCCS is an attractive solution. Their system is both straightforward to install and places a low operational burden on the crew. Carbon Ridge has demonstrated the technical capability and understanding required for marine deployment, and we look forward to building on this partnership.”

The Scorpio Tankers pilot marks the first deployment of a centrifugal OCCS system in maritime operations.