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Module 7: Liquefied Natural Gas (LNG)

MODULE 7: OVERVIEW

Introduction Liquefying natural gas is a second way to increase its energy density to allow more fuel to
be stored onboard vehicles and therefore increase vehicle range.

o
Liquefied natural gas (LNG) is natural gas that has been chilled to -260 F and exists in
what is referred to as a cryogenic state.

LNG vehicles store natural gas in onboard cryogenic tanks until it is called for by the
engine.

Importance Unlike CNG vehicles, LNG vehicles have properties, such as venting of gas, that are
normal. In addition, LNG is an unodorized fuel, which cannot be detected by humans.

Technicians working in or around LNG vehicles need to be able to identify LNG vehicles
and the differences between LNG and CNG, as well as LNG and diesel.

Module Overview This module describes LNG, how it is made, and how LNG compares to other fuels.

Learning Objectives ▪ Describe how LNG is made and its properties and characteristics
▪ Explain the differences between LNG and CNG
▪ Compare LNG with diesel

Order of Lessons Lesson 7.1: What is LNG and How is it Made?
Lesson 7.2: How Does LNG Compare to CNG?
Lesson 7.3: How Does LNG Compare to Diesel Fuel?

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