Page 58 - ESP (CNG & LNG) Participant Guide

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

Properties of LNG – LNG Colder Than -160 F
o
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) © 2023 NGVi All Rights Reserved Page 7-2