Page 57 - CNG/ LNG ESP Participant Guide 2024
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Module 7: Liquefied Natural Gas (LNG)
Lesson 7.1: What is LNG and How is it Made?
What is LNG? ▪ Natural gas is cooled to -260°F
▪ Stored in cryogenic tanks
▪ Transported via truck to the fueling
site
LNG is a Storage ▪ Engines operate on natural gas, regardless of the way fuel is stored
Method Only ▪ LNG storage tanks are very different
o Other fuel system components are similar to CNG components
o
Properties of LNG – LNG Colder Than -160 F
o
Liquid-to-Vapor ▪ Fully liquefied @ -260 F
Transformation ▪ Heavier than air
o Will pool on ground
o
LNG Warmer Than -160 F
▪ Fully vaporized
▪ Lighter than air
o Will rise when released
Lesson 7.2: How Does LNG Compare to CNG?
LNG vs CNG
Property CNG LNG
Odor Odorized Unodorized
Physical State Gaseous Liquid or Gas
o
When it Leaks Does not pool Pools when <-160 F
Temperature Non-cryogenic Cryogenic
Vent only under abnormal
Cylinder or Tanks Vent under normal conditions
conditions
Pressure High (3,600 psi) Low (+/- 230 psi)
NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 7-2
