Compressed Natural Gas or Liquid Natural Gas: How to Choose Between the 2 Fuels

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There are many different types of fuel. And for a commercial fleet owner or a future buyer of a natural gas vehicle (NGV), deciding which fuel to use can be difficult.

Nevertheless, in this article, we will attempt to answer the famous question: which should you choose between compressed natural gas (CNG) and liquid natural gas (LNG)?

Compressed Natural Gas or Liquid Natural Gas: An Overview

While both are natural gases, CNG and LNG are quite distinct from each other. And choosing between them partly depends on their intended use.

Choosing the fuel

For example, CNG can be used for most, if not all, vehicle types. However, this fuel is particularly well-suited for vehicles that travel moderate distances between fueling stops.

Dump trucks, couriers, school buses and other public transit vehicles are suitable for the use of CNG as a fuel.

Conversely, LNG is more appropriate when greater autonomy is required. Why is this? Primarily because a liquefied natural gas tank can hold 2.5 times more fuel than a compressed natural gas tank of comparable size.

Class 8 locomotives, ships and road tractors are well suited to using LNG.

CNG and LNG: Non-Interchangeable Natural Gases

Despite the fact that they are both fuels, CNG and LNG are not interchangeable. Each requires vehicles that are entirely suited to their specific use.

For example, it would be unthinkable to refuel a CNG truck with LNG, especially since the two natural gases are not produced in the same way.

Different modes of production

For example, CNG is compressed at high pressures in the range of 3,000 to 3,600 pounds per square inch to reduce its volume by a factor of at least 300 relative to gas at normal temperature and pressure.

LNG, on the other hand, is produced by cooling the temperature of the gas to -162°C, a process that converts it to a liquid state in order to reduce its volume. This process reduces its volume by a factor of 600 compared to gas at normal temperature and pressure.

In short, one is the product of compression while the other is the product of cooling. These notable differences require vehicles that are 100% suitable for their use.

Choosing Between Compressed Natural Gas or Liquid Natural Gas

How do you choose between CNG or LNG? In light of the above information, you are now better equipped to make an informed choice. Of course, this article is only an overview of the topic, and if you have more questions, please feel free to visit the blog section of our website or contact us. We’ll be happy to answer them.