DNV has confirmed that a centrifugal onboard carbon capture and storage system developed by Carbon Ridge achieved CO2 capture rates of more than 98% during a five-month pilot onboard Scorpio Tankers’ LR2 product tanker, STI Spiga.
The assessment was conducted under DNV’s Recommended Practice for performance verification of OCCS systems. According to DNV, the review validated the methodologies, calculations and reported performance metrics used during the trial, and corroborated the reported capture-rate results.
The pilot began in July 2025 following installation of the system onboard the 109,999-dwt product tanker at Besiktas Shipyard in Türkiye. The vessel subsequently operated in normal commercial service while data was collected.
DNV reported that peak CO2 capture rates exceeded 98%, with 55% of recorded observations falling within a range of 86% to 98%.
Carbon Ridge said the technology uses a centrifugal process to capture a portion of a vessel’s exhaust emissions before the recovered CO2 is compressed, liquefied and stored onboard for the duration of the voyage.
Chase Dwyer, founder and CEO of Carbon Ridge, said: ‘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. The initial data and learnings from the STI Spiga trial further underpin our ambitions to scale Carbon Ridge’s OCCS across the global fleet.’
On the verification process, Chara Georgopoulou, Head of Onboard Carbon Capture at DNV Maritime, said: ‘Independently verified carbon capture rates will be vital to building out a commercially viable business model for OCCS. 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.’
Carbon Ridge said its technology reduces space requirements by up to 75% compared with conventional OCCS columns. The company added that the system can be installed in either vertical or horizontal configurations, depending on vessel requirements.
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.’
