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Marine SCR systems

Marine SCR

Marine SCR Systems for IMO Tier III Compliance and NOx reduction

Ecoexhaust is a marine SCR supplier delivering Selective Catalytic Reduction (SCR) systems for IMO Tier III compliance.

The company designs and manufactures compact marine SCR and SCR-DPF solutions for diesel engines, supporting newbuild and retrofit installations on vessels operating in NECA and ECA areas.

Ecoexhaust focuses on space-constrained engine rooms, providing flexible SCR integration for workboats, offshore vessels, inland navigation and short sea shipping.

Marine SCR Applications
Ecoexhaust SCR systems are engineered for a wide range of marine applications, including:
  • Marine engines (2-stroke and 4-stroke)
  • IMO Tier III / MARPOL Annex VI compliance
  • NOx tax reduction in Norway
  • NECA and ECA operating areas
  • Newbuild and retrofit installations
  • Space-limited engine rooms

As an engine-agnostic marine SCR supplier, Ecoexhaust supports installations across different engine brands and configurations.

Technical Scope of Supply

Ecoexhaust delivers complete marine SCR systems, including engineering, manufacturing and integration support.

System configurations

  • Post-turbo and pre-turbo SCR layouts
  • Stand-alone SCR reactors
  • Combined SCR-DPF systems
  • Integration with existing exhaust systems
  • Exhaust gas bypass valves
  • Soot blowers

Design features

  • Compact and modular SCR design
  • Optimized exhaust back-pressure (Δp)
  • Stable NOx reduction across variable engine loads
  • Catalyst selection adapted to exhaust gas temperature and fuel type

Fuel compatibility

  • MGO / MDO
  • HFO (where applicable)
  • Methanol
  • HVO
  • Ammonia
  • LNG
Retrofit Expertise – Compact Marine SCR Solutions

Ecoexhaust is particularly experienced in marine SCR retrofit projects, where space, downtime and integration risks are critical.

Typical retrofit solutions include:

  • Compact reactor designs for restricted engine rooms
  • Minimal modification to existing exhaust piping
  • Reduced installation time and vessel downtime

This makes Ecoexhaust a preferred SCR supplier for existing vessels requiring IMO Tier III compliance upgrades.

Certification and Class Support
Ecoexhaust marine SCR systems are designed to support:
  • IMO Tier III compliance
  • EIAPP certification process
  • Integration into the vessel NOx Technical File

The company cooperates with major classification societies, including:

  • DNV
  • Lloyd’s Register (LR)
  • ABS
  • Bureau Veritas (BV)

This ensures smooth approval by class.

RFQ-Ready Engineering Support

Ecoexhaust is structured to support professional RFQ processes for marine SCR projects.

Typical RFQ data supported

  • Engine type, rating and manufacturer
  • Exhaust gas temperature range, exhaust gas flow
  • Allowable exhaust back-pressure
  • Estimated urea (AUS40 / DEF) consumption
  • General arrangement and interface drawings

This approach allows fast technical alignment with shipowners, shipyards and consultants.

Why Choose Ecoexhaust as Your Marine SCR Supplier
  • Independent and engine-agnostic SCR supplier
  • Proven experience in marine aftertreatment systems
  • Strong focus on retrofit and compact SCR designs
  • Engineering-driven solutions, not catalogue products
  • Responsive support during design, installation and certification

Ecoexhaust is frequently considered alongside established marine SCR providers in projects where flexibility, compactness and retrofit capability are essential.

Typical Project Examples
Retrofit SCR installation – Fjord Shipping AS

Contact us

For marine SCR systems, retrofit solutions or IMO Tier III compliance support, please contact Ecoexhaust to discuss your project requirements

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