W20DF released to US market for EPA Tier 4
Wärtsilä has released its 20DF dual-fuel engine for sale in the US market, with full compliance with the strict United States Environmental Protection Agency (EPA) Tier 4 emissions limits.
By extending the availability of dual-fuel engine technology, Wärtsilä says that it can offer the American marine sector greater possibilities to select fuel that enables compliance with environmental legislation. In addition to the environmental benefits attained from burning gas, the choice of fuel can now be made on the basis of price and availability since Wärtsilä's dual-fuel (DF) technology allows engines to use either natural gas or diesel oil.
The technology is said to be proving attractive in particular to fleet owners operating within the North American ECA, where strict control is now in force on emissions of SOx, nitrogen oxides NOx and particulate matter. The 20DF is a proven, commercial duty, medium-speed engine for both propulsion and auxiliary applications, spanning the power range of 1,415bhp to 2,122bhp. The versions supplied to the US market will be configured to operate primarily on natural gas, with MDO as a pilot fuel or as an emergency backup fuel. The company says that its low pressure dual-fuel technology employs a very small amount of diesel fuel as a pilot ignition source, amounting to about 1%, contrasting with some other gas engine technologies that employ a significantly higher percentage of diesel pilot fuel.
Lars Anderson, vice president, four-stroke, Wärtsilä Ship Power, said: "The Wärtsilä 20DF will further accelerate the adoption of LNG as a marine fuel in the US. The ability to meet EPA Tier 4 emissions requirements without the need for exhaust after-treatment, while at the same time increasing the safety and operational flexibility for LNG vessels, provides significant value to our customers."
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