Industries: Maritime
IMO Tier III emission control and exhaust acoustics for marine and offshore power, engineered to your engine, your class society, and the space and weight you actually have on board.
What we deliver
Vessels operating in NOx Emission Control Areas must meet IMO Tier III, roughly an 80 % cut in NOx over Tier II, while marine and naval crews still need the uptake quiet enough to live and work next to. Axces engineers the exhaust train from turbocharger outlet to funnel: SCR DeNOx, particulate reduction, and uptake silencing sized to your specific engines and operating profile.
Marine work is constrained work. We model back-pressure, catalyst space velocity and insertion loss against the limited length, footprint and weight budget of the engine casing, so the system clears Tier III and the crew-space noise limit without exceeding the back-pressure your engine builder allows.
Everything is built in marine-grade stainless to the classification-society rules your vessel is being approved under, shipped with the documentation your class surveyor and flag state will ask to see, and packaged to be lifted into the casing on the yard’s schedule.
Products for maritime
Six core assemblies cover the marine and offshore exhaust line, each specified against your engine data, class rules, and the space you have on board.
SCR system
Urea-dosed selective catalytic reduction sized to marine engine flow and temperature for IMO Tier III NOx limits.
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Silencer
Absorptive and combination silencing for engine and genset uptakes, sized to crew-space and quayside noise limits.
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Particulate
Diesel particulate filtration for marine engines where visible smoke and PM limits apply in port.
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Vent silencer
Intake and discharge ventilation silencing for engine-room fans and pressure-relief openings.
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Separation
Droplet and water separation for wet exhaust and scrubber-equipped uptakes, protecting downstream equipment.
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Gas turbine
Intake and exhaust silencing for naval gas-turbine propulsion and generating sets.
Learn moreWhy Axces
Five reasons marine and naval projects specify Axces for Tier III exhaust and uptake acoustics.
Our approach
A four-step process that keeps emission, noise and weight risk off the critical path of the build.
We take your engine data, the ECA / Tier III requirement and the casing envelope, and define back-pressure, NOx and insertion-loss targets.
Flow, catalyst space velocity and attenuation are simulated against the available space and weight before any steel is cut.
Assemblies are built in marine-grade stainless to the class rules, with material and weld traceability for survey.
We support installation and class witness testing, handing over the emission and acoustic data your surveyor requires.
Industry context
Emission Control Areas, class rules and on-board constraints are tightening what a marine exhaust system has to do.
NOx Emission Control Areas require Tier III on new builds, pulling SCR onto vessels that previously ran untreated exhaust.
Engine casings are tight and weight-critical; the exhaust train has to deliver compliance inside a fixed envelope.
Every assembly must be designed, documented and tested to the rules of the vessel’s classification society.
Variable fuels, load profiles and exhaust temperatures have to be handled without losing NOx conversion or quiet running.
From the knowledge hub
A plain-language map of the main EU and marine emission regimes, and how to tell which NOx, CO and particulate limits actually bind your vessel before you specify an exhaust train.
Read the articleTalk to an engineer
Send us your engine data, the Tier III requirement and your casing constraints and we will scope the exhaust and uptake train for your ship.
Discuss your project