Heavy Duty Vehicles are Increasingly Moving to LNG as a Fuel of Choice
Using LNG and natural gas to fuel vehicles reduces greenhouse gas emissions by 30 percent versus conventional liquid fuels. Source: Department of Energy.
Liquefied Natural Gas (LNG) vs. Compressed Natural Gas (CNG) – What’s the Difference?
LNG requires only 30 percent of the space of Compressed Natural Gas (CNG) to store the same amount of energy. In order to keep the LNG cold, LNG is stored on-board vehicles in thermally insulted storage tanks. When the engine in natural gas vehicle (NGV) is started, the LNG is heated, converting it back to a gas. From that point on, the fuel supply process is similar to the system on CNG-fueled engines. (Natural Gas Vehicles for America)
LNG vs. Conventional Liquid Fuels
Vehicular LNG storage systems are designed to retain evaporative losses within the fuel storage tank for up to five days. Gasoline and diesel fuel are stored at ambient temperature. Gasoline and diesel vehicle fuel systems incorporate vapor recovery systems to capture evaporative losses.
While LNG can be produced on-site at a fuel delivery station from locally available natural gas, it is typically delivered to the station via tanker truck. In either case, the LNG is stored onsite in special cryogenic storage tanks. To fuel vehicles, LNG is pumped into the vehicles much like other liquid fuels (although using more sophisticated fueling equipment capable of withstanding the colder temperatures of LNG).