The maritime industry is confronting an increasingly serious environmental challenge – soot pollution arising from inert gas (IG) systems and open-loop exhaust gas scrubber operations.
What were once considered isolated or incidental events have now evolved into a systemic issue, exposing shipowners and operators worldwide to potential significant operational disruption, financial loss, and regulatory scrutiny, says West of England P&I Club.
To date, the Club has recorded over 60 documented incidents, although the true scale of the problem is believed to be substantially greater.
These events are no longer regarded as minor environmental infractions. Instead, they frequently carry severe legal and financial consequences, including vessel detentions, delays, clean-up obligations, and substantial fines. As environmental enforcement intensifies across multiple jurisdictions, ship operators are facing heightened scrutiny and increasingly punitive responses from port and coastal State authorities.
Escalating Enforcement and Penalties
Growing environmental awareness has led many ports and coastal States to prohibit open-loop scrubber operations entirely. Elsewhere, inspections have become more intrusive and penalties more severe. Jurisdictions such as Turkey and the UAE are notable for their strict and highly visible enforcement approaches.
Depending on the jurisdiction the fines can be in the range of a few thousand dollars to millions of dollars. The Club has experience where vessels have been subject to fines exceeding USD 1 million for serious pollution incidents.
The absence of uniform international standards – particularly for Inert Gas Systems (IGS) discharges – further complicates compliance and exposes ship operators to regulatory uncertainty, financial risk, and reputational damage.
Preventive Measures and Best Practices
Most soot pollution incidents are entirely preventable through disciplined operations, effective training, and proactive maintenance. Shipowners and operators are strongly encouraged to adopt the following best practices:
- Strict Adherence to Manufacturer Guidance. Follow manufacturer-recommended operating procedures and maintenance instructions for IG systems and scrubber systems without deviation.
- Comprehensive Pre-Operation Inspections. Conduct thorough system checks before activation, ensuring all critical components and alarms are fully functional.
- Crew Training and Competency Development. Ensure crew members are adequately trained in normal operation, fault recognition, troubleshooting, and emergency response.
- Adoption of Cleaner Technologies. Consider transitioning to hybrid or closed-loop scrubber systems, particularly when trading in regions with strict environmental controls.
- Robust Record-Keeping. Maintain detailed logs of system operation, maintenance activities, sensor readings, and visual observations to demonstrate compliance and support incident investigation.
- Enhanced Preventive Maintenance Regimes. Implement maintenance programmes that exceed minimum regulatory requirements, including scheduled inspections and timely replacement of critical components. A vessel-specific operational checklist is strongly recommended.
- Real-Time Monitoring and Early Detection. Utilise continuous monitoring systems to identify deviations in performance at an early stage, allowing corrective action before a discharge occurs.
The Club also shared details on understanding the sources: inert gas systems and scrubber systems, as well as information on regulatory standards and gaps.
Download the PDF: West P&I Club - Soot Pollution from Inert Gas Systems and Open-Loop Scrubbers