Classification society ClassNK has released a new handbook titled Onboard Carbon Capture Systems Implementation Framework as part of its Handbook on Ship GHG Emissions Evaluation series.
The guide outlines technical, regulatory, and infrastructure considerations across the full project lifecycle, covering shipboard capture, offloading logistics, end-use or sequestration pathways, and MRV protocols.
ClassNK emphasizes that OCCS adoption requires robust Chain of Custody (CoC) and emissions accounting mechanisms to verify net carbon reductions beyond physical hardware installation.
Classification society ClassNK has published a comprehensive guidance document titled Onboard Carbon Capture Systems Implementation Framework to support shipowners, operators, and maritime stakeholders in evaluating onboard carbon capture systems (OCCS).
Issued as part of ClassNK ‘s ongoing Handbook on Ship GHG Emissions Evaluation series, the publication provides a structured approach for evaluating OCCS projects from initial technical feasibility through final carbon sequestration or utilization.
As the maritime sector evaluates operational measures, energy-efficiency hardware, and alternative fuels to meet decarbonization targets, onboard capture from vessel exhaust gases has emerged as a potential bridge solution for commercial fleets.
ClassNK stresses that verifying real-world greenhouse gas reductions from OCCS extends beyond retrofitting or installing onboard capture hardware.
Successful commercial adoption depends on establishing reliable offloading, transportation, and port receiving infrastructure alongside permanent subsea storage or industrial utilization pathways.
To establish credible decarbonization claims, the framework outlines essential accounting mechanisms, including:
Monitoring, Reporting, and Verification (MRV): Standardized protocols to quantify actual CO2 volumes captured and stored onboard during voyage operations.
Chain of Custody (CoC) Systems: Traceability frameworks to track captured CO2 and its associated carbon attribute data from vessel discharge through to final offload, transport, and permanent geological sequestration or utilization.
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