Page 59 - ESP (CNG & LNG) Participant Guide

Module 7: Liquefied Natural Gas (LNG)

Lesson 7.3: How Does LNG Compare to Diesel Fuel?

Source and Property Diesel Fuel LNG
Physical State Source Petroleum Natural Gas
Physical State Liquid Liquid or Gas, depending on
temperature
Vapor Density >1 >1 or < 1, depending on
temperature

Ignition and Property Diesel Fuel LNG
Flammability Ignition Temperature 400 F 900-1080 F
o
o
Flammability Range .6-7.5% 5-15%

Weight and Energy Property Diesel Fuel LNG
Weight per gallon or GGE 7 lbs. 3.5 lbs.
BTU (Energy) content per 140,000 75,000
gallon

Octane and Cetane Property Diesel Fuel LNG
Ratings Octane Rating N/A 130
Cetane Rating 40-60 <0

Transportation and Property Diesel Fuel LNG
Storage Transported to Fueling Truck Truck; manufactured at the
Stations site
Stored at Fueling Stations Underground storage tanks Above ground cryogenic
tanks

Module 7: Knowledge Check

Liquefied natural gas, or LNG, is natural gas that has been chilled to:
o
□ -160 F
o
□ -500 F
□ -260 F
o
o
□ 0 F

Which of the following properties are true of LNG?
□ It is odorless, always lighter than air and requires personal protective equipment.
□ It is odorless, can be heavier than air or lighter than air depending on its temperature and requires personal
protective equipment.
□ It is odorless, and its tanks never vent.
□ It is always lighter than air and its tanks never vent.

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