Natural gas is liquefied by cooling it to -160 °C (-260 °F) at atmospheric pressure. At that temperature, LNG occupies 1/600th the volume of natural gas at atmospheric temperature and pressure. The high energy density of LNG makes it useful for energy storage in double-walled, vacuum-insulated tanks.
LNG accounts for an increasing amount of natural gas consumption worldwide, and is produced in dozens of large-scale liquefaction plants. These are operated by distribution utilities for seasonal storage and by companies that ship natural gas by tanker across oceans.
LNG is a relatively new fuel for trucking. Many existing liquefaction plants aren't designed to serve the needs of truckers and aren't located in places convenient for truck refuelling. As LNG becomes more widely used for vehicles, production facilities will change to accommodate this economic activity.
Data from the Department of Energy Alternative Fuels Data Center provides information about the location of LNG refuelling stations in the U.S. Cummins Westport expects that the initial users of LNG trucks will be fleets whose vehicles return to the fleet yard at night for refuelling. As more facilities become available on public highways, long-range truck operators may also consider using LNG.
Cummins Westport engines can accept a wide range of natural gas fuel compositions. Use our Fuel Performance Specification Calculator to ensure compatibility.
More information on alternative fuels: Alternative Fuels Links