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Connect with usThe route to IMO Tier III Compliance is clear
Integrated exhaust aftertreatment systems for full emissions compliance
Operating within Emission Control Areas (ECAs) demands more than incremental improvements, it requires an engineered approach to NOx reduction, particulate control, and system integration. Under IMO Tier III regulations, vessels must achieve up to 80% NOx reduction compared to Tier I baselines, making advanced exhaust aftertreatment systems not just beneficial, but essential.
For OEMs, naval architects, boat builders and shipyard engineers, the challenge is clear: how to deliver compliant, efficient and future-ready vessels without compromising performance, space, or project timelines.
The challenge in modern marine design
Designing for IMO Tier III emission compliance can face complex engineering and commercial pressures, such as:
Regulatory complexity across ECAs
With ECAs spanning the North Sea, Baltic Sea, North America and beyond, compliance is operationally critical. Each vessel must meet stringent NOx emission limits when operating within these zones, requiring reliable and certifiable emission control technologies aligned with International Maritime Organization standards.
Space and integration constraints
Workboats and defence vessels often operate within tight spatial envelopes. Integrating Selective Catalytic Reduction (SCR) technologies without affecting vessel architecture or stability can present challenging design constraint.
Performance vs emissions trade-offs
Maintaining engine efficiency, fuel consumption targets and operational uptime while achieving emissions compliance remains a key concern, particularly across variable duty cycles common in commercial workboats.
Retrofit vs newbuild complexity
Retrofitting existing vessels for EPA and ECA compliance introduces additional challenges:
- Limited installation space
- Legacy engine compatibility
- Downtime and cost pressures
Supply chain management
Sourcing separate components for SCR, filtration and control systems from multiple suppliers increases risk, complicates integration, and often leads to performance inconsistencies.
Eminox fully integrated approach to maritime exhaust aftertreatment
To address these challenges, Eminox Group, incorporating Emission Control by Eminox, SaveGuard and Ceramex, offers a single-source, globally supported exhaust aftertreatment solution to ensure an effective route to emissions compliance.
Our approach combines:
- Maritime SCR systems engineered for precise NOx reduction (IMO Tier III emissions compliance)
- Diesel Particulate Filters (DPF) for particulate matter control (Stage V Inland Waterways emissions compliance, when added to SCR technology)
- Hybrid and dual-fuel compatibility for future-ready propulsion systems
- Full system integration, from design through to commissioning
Our integrated methodology ensures that every component functions as part of a cohesive system, optimised for both compliance and operational performance.
Maritime SCR systems engineered for IMO Tier III
Selective Catalytic Reduction (SCR) remains the most effective and widely adopted technology for achieving IMO Tier III NOx limits.
Key Advantages of maritime SCR:
- Over 90% NOx reduction efficiency, depending on operating conditions
- Proven compliance within all global ECAs
- Scalable across 130 kW to 3MW engine platforms
By injecting a urea-based reductant into the exhaust stream, SCR systems convert harmful nitrogen oxides into harmless nitrogen and water vapour, ensuring regulatory compliance without compromising engine performance.
Designed for multiple applications
Our systems are purpose-built for the operational realities of:
Commercial workboats
- Tugs, pilot boats, crew transfer vessels, and offshore support vessels
- High load variability and frequent transient operation
- Demanding uptime and durability requirements
Naval and defence vessels
- Strict space, weight and acoustic constraints
- Mission-critical reliability
- Compliance with evolving environmental standards
Our scalable, platform solution is engineered to integrate seamlessly within the vessel’s architecture, supporting both newbuild and retrofit projects.
Collaborative engineering from concept to commissioning
Delivering emission compliance is not a one-size-fits-all approach. Eminox engineering experts collaborate closely with customer project teams across the entire vessel development lifecycle.
Our approach:
- Early-stage consultation with OEMs, boat builders and naval architects
- System modelling and simulation to optimise performance
- Customised integration strategies for shipyards and engineers
- On-site support during installation and commissioning
- Ongoing lifecycle services and technical support
This partnership-driven model ensures that compliance is achieved efficiently, with minimal risk to project timelines or operational performance.
Global capability, local expertise
With a global manufacturing footprint and established OEM relationships, we support projects across all major maritime regions and ECAs.
Our teams understand the regulatory nuances of different territories and provide:
- Localised technical support
- Rapid response for retrofit projects
- Scalable production for fleet-wide deployment
This ensures consistency, reliability and compliance wherever your vessels operate.
Future-proofing emission control
As environmental regulations continue to evolve, vessel operators and designers must prepare for increasingly stringent standards.
Integrated exhaust aftertreatment systems provide a future-ready platform, supporting:
- Transition to hybrid and alternative fuel propulsion
- Continued compliance with tightening IMO and EPA regulations
- Reduced environmental impact and improved sustainability credentials
Take control of IMO Tier III compliance
Whether you are designing a new vessel or retrofitting an existing fleet, achieving emission compliance requires a partner who understands both the technical and operational landscape.
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Speak to our engineering team today to discuss your project requirements and discover how we can support your next project
