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Tug Technology & Business

Wärtsilä clinches US Tier 3 emissions certificates for tug engines

Tue 16 May 2017 by Martyn Wingrove

Wärtsilä clinches US Tier 3 emissions certificates for tug engines
The six-cylinder in-line Wärtsilä 34DF engine features advanced dual-fuel technology and high efficiency

Wärtsilä been awarded an emissions compliance certificate from a key US authority which will enable it to sell dual-fuel engines for North American tug newbuilding projects

Wärtsilä Corp has gained certification of emissions compliance from the US Environmental Protection Agency (EPA) for its 34DF dual-fuel engine series. This will enable tug builders to use Wärtsilä 34DF engines on projects to meet EPA’s tough Category 3 Tier 3 requirements.

Wärtsilä Marine Solutions said these were the first Category 3 Tier 3 certificates issued by the EPA to any manufacturer. The Category 3 relates to engines with a displacement per cylinder of more than 30 litres.

Wärtsilä also received an engine international air pollution prevention (EIAPP) certification for the 34DF engines. Both certificates cover engines manufactured during the period from March to the end of 2017.

EPA’s certification verifies that the Wärtsilä 34DF engine is fully compliant with the Tier 3 emission standards in gas mode operations.

The engine is equipped with a continuous nitrogen oxide (NOx) measuring and monitoring system for verifying emissions compliancy inside NOx emission control areas (NECA), as required by the EPA Tier III standard.

When workboats are sailing outside NECAs, the fuel-flexible 34DF engine can be operated with conventional marine diesel fuels if required, said Wärtsilä Marine Solutions product director for medium bore engines, Patrik Wägar.

He added: “Our technology is leading the way to greater environmental sustainability and a cleaner maritime industry. It is an honour for the company to be the first to be awarded this important EPA certification.”

Wärtsilä Marine Solutions product manager for the W32/34 engines Rasmus Teir said these engines have already been ordered and delivered to multiple dual-fuel workboat and tug projects. “We have references in various sub segments,” he said. “We have delivered 10 Wärtsilä 34DF engines for tug projects and around 50 engines for offshore supply vessels.”

"We have delivered 10 Wärtsilä 34DF engines for tug projects"

Some of these earlier references, such as those for a series of six offshore support vessels for Harvey Gulf Marine, involved engines that met EPA’s less stringent Tier 2 criteria. For these vessels, ordered from Trinity Offshore shipyard, Wärtsilä supplied three W6L 34DF engines for each vessel.

Two of Wärtsilä’s tug references for the 34DF engines were for vessels built in China, said Mr Teir. Wärtsilä supplied four W6L 34DF engines for tugs built by Ghangzhou Huangpu shipyard for China National Offshore Oil Corp (CNOOC).

These were 80-tonne bollard pull Hai Yang Shi You 521 and Hai Yang Shi You 522 tugs, which entered service in Chinese ports in 2013.

Wärtsilä is also supplying engines for three dual-fuel tugs that Gondan Shipyard in Figueras, Spain has built for Norwegian owner Østensjø Rederi.

The Wärtsilä 34DF engine is based on the Wärtsilä 32 diesel engine, but with the gas fuel option. The fuel flexibility means the engine can be optimised for constant speed generating sets and variable speed mechanical drives for main engine applications, said Wärtsilä.

Wärtsilä 34DF engine features

  • Fuel flexibility
  • 6 to 16 cylinder configurations
  • Power range - 2,880kW to 8,000 kW
  • Based on Wärtsilä 32 diesel engine
  • Optimised for constant speed generating sets

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