Alternative Fuels: Liquefied Natural Gas 101

What is Liquefied Natural Gas (LNG)?

Liquefied natural gas is made easier to store and transport due to being turned into a liquid form.


LNG Vs CNGNatural gas (NG) has less energy by volume than liquid fuels. Natural gas must be either liquefied (LNG) or compressed (CNG) to get the adequate vehicle range. Both LNG and CNG are types of energy with a lower density compared to liquid fuels that have a petroleum base. Consequently, Natural Gas Vehicles (NGVs) must, to ensure an equal energy storage, have a larger fuel tank.

LNG Basic Properties

LNG is an odorless, colorless, non-toxic, and non-corrosive natural gas that becomes a liquid at -260°F (-162°C ) when cooling condenses it. Compared to natural gas, LNG takes up 1/600 the volume in atmospheric pressure in ambient vapor form. Liquefied natural gas is stored in double-wall pressure vessels that are also vacuum-insulated. LNG fuel systems usually are reserved for automobiles that engage in extended driving and are heavy duty. .

Types of LNG

Saturated and Unsaturated LNG

Types of LNG

The difference between saturated and unsaturated liquefied natural gas is fuel temperature.

“Warm” LNG is saturated, while “cold” LNG is unsaturated. Liquefied natural gas is a “cold” fuel; the warmer it gets, the more it expands. It becomes saturated when any vapor present is the same temperature as the fuel’s liquid. A color-coding system is used to differentiate the two fuel types, with blue representing cold LNG and green representing warm. Since saturated LNG is warmer than the unsaturated form, it results in a higher tank pressure.

To learn more about alternative fuels, please contact Colorado West Equipment. We are the number one bus dealer in Colorado. Whether you are looking for new or used transit or fleet buses, we have all you are seeking for your transportation needs. Contact us today!

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