More than 18 million vehicles around the world use natural gas.
There are more than 150,000 such vehicles in the United States, and, in Canada, it is gaining popularity among more and more road carriers. Two different forms of natural gas for vehicles are used: compressed natural gas and liquefied natural gas.
Natural gas is compressed at high pressure to reduce its volume 300 times. The fuel remains in the gaseous state and is stored in thermo-like tanks installed on the vehicle. A compression system linked to the natural gas distribution system makes for easy and practical refuelling. Indicated use: light, medium and heavy vehicles or materials handling equipment
Natural gas is chilled to -162°C until it becomes liquid in order to reduce the volume 600 times. It is stored in double-walled vacuum tanks installed on the vehicle. Refuelling can be done at public stations or on your private site; delivery is made by tanker trucks, just like diesel and gasoline. It is an excellent option for vehicle fleets not located near the natural gas distribution system.
Indicated use: heavy trucks, rail and maritime transportation.
In both cases, these engines have been proven; that is why many natural gas vehicles are available in North America and why manufacturers issue extended warranties, in particular for the heavy truck, tool truck and bus markets.