Wärtsilä Launches 31SG Engine For Marine Market

By Jack Burke18 September 2019

The Wärtsilä launched the 31SG gas engine for the marine market, saying it’s well-suited for hybrid applications.

The 31SG, which is based on the company’s 31 product platform, is available in 8 to 16 cylinder configurations and has a power output ranging from 4.2 to 8.8 MW, at 720 and 750 rpm.

The commercial launch of the Wärtsilä 31SG takes place in September at the Gastech 2019 conference and exhibition being held in Houston, Texas, USA, as well as at the Neva St. Petersburg exhibition and maritime forum in St.Petersburg, Russia.

Following Wärtsilä’s introduction of dual-fuel engine technology in the 1990s, liquefied natural gas (LNG) has become established as a viable and attractive marine fuel, the company said. This has led to the rapid expansion of the global LNG bunkering infrastructure, which sets the stage for the next evolutionary step, namely a larger scale application of pure gas engines within the marine and offshore industries.

“The highly efficient Wärtsilä 31SG moves the industry forward by providing owners and operators with a practical means for lowering costs and enhancing environmental sustainability. The gas-only focus and lean-burn spark ignition technology allows for further optimization of thermal efficiency, while lowering greenhouse gas emissions and facilitating adaptations for alternative heavier gas fuels, such as LPG,” sid Rasmus Teir, product manager, Wärtsilä Marine.

Wärtsilä said it has an extensive track record with SG lean-burn technology, with more than 1800 engines delivered and 37 million running hours accumulated in demanding land-based energy market applications. The Wärtsilä 31SG was introduced to the energy market in 2017, and now builds on this pedigree to offer reliable pure gas solutions with low lifecycle costs also for marine customers.

The increasing adoption of hybrid propulsion offers additional opportunities for pure gas engines. The Wärtsilä 31SG is ideally suited for hybrid applications, since it provides outstanding thermal efficiency while also providing investment cost reductions that help offset the additional cost of energy storage, the company said. Pairing the Wärtsilä 31SG with battery packs furthermore enables designing for redundancy, while securing the highest total system efficiency.

This latest Wärtsilä development is in line with the company’s target for reducing the greenhouse gas emissions from gas engines by 15 percent from 2015 levels by 2020.

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