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Wärtsilä engine certified EPA Tier 3 compliant in diesel mode

Tue 10 Jul 2018

Wärtsilä engine certified EPA Tier 3 compliant in diesel mode
A 6-cylinder Wärtsilä 34DF dual-fuel engine

The US Environmental Protection Agency (EPA) has certified Wärtsilä’s 34DF engine as compliant with its Tier 3 emission limits when the unit is operating in diesel mode together with Wärtsilä’s selective catalytic reduction (SCR) system.

Wärtsilä is the first engine manufacturer to be awarded a Tier 3 EPA certification for this engine system configuration. The 34DF engine model was awarded EPA’s Tier 3 certification of emissions compliance when operating in gas mode without an SCR system in 2017. And the engine has been certified to meet IMO Tier III emissions requirements in both operating modes.

EPA Tier 3 requirements set limits for nitrogen oxide (NOx) and hydrocarbon emissions as well as acceptable levels of particulate matter. Wärtsilä’s NOx Reducer system, like other SCR systems, uses a catalyst to convert nitrogen oxides into diatomic nitrogen and water.

EPA Tier 3 NOx requirements entered into force in 2016 for Category 3 engine sizes – engines with a cylinder displacement at or above 30 liter/cylinder – to be installed in US- flagged or registered vessels.

The 34DF engine is manufactured in configurations from 6 to 16 cylinders covering a power range of 2,880 – 8,000 kW for marine applications.


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