Page 33 - Penske_Student Guide Book

Module 8: Liquefied Natural Gas (LNG) and LNG Vehicles

Learning Objectives
1. Describe how LNG is made and its properties and characteristics.
2. Identify the differences between LNG and CNG.
3. Identify the unique hazards of LNG.
4. Identify an LNG vehicle.
5. Describe the safety practices when servicing LNG vehicles.

Slide Topic Content Notes

What Is LNG and How Is It  Natural gas is cooled to
Made? -260°F

 Stored in cryogenic tanks

How LNG Compares to CNG

Property CNG LNG
Odorant Odorized Unodorized
Physical State Gas Liquid OR gas (depending on
temperature)
Fuel storage vents Lighter than air
Pressure Does not pool Liquid – heavier than air/pools
Gas – lighter than air/rises
Non-cryogenic
Only under abnormal Cryogenic (-260ﾟF)
conditions Under normal conditions – may
be frequent
High pressure (3,600 psi)
Low pressure (230 psi)

Properties of LNG and  LNG colder than -160°F

Liquid-to-Vapor Transformation  Fully liquefied @ -260°F

 Heavier than air

 Will pool on ground

 LNG warmer than -160°F
 Fully vaporized
 Lighter than air
 Will rise when released

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