LNG Blue Corridors
Demonstration of heavy duty vehicles running with liquefied methane

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18,663,650.0
km
41793
fillings
4885608
kg

Can LNG explode?

Fuel (Gas or vapor)

Lower Flammable Limit
(LFL)
(%)

Upper Flammable Limit
(UFL)
(%)

n-Butane

1.86

8.41

Butyl alcohol, Butanol

1

11

Diesel fuel

0.6

7.5

Ethyl Alcohol, Ethanol

3.3

19

Fuel Oil No.1

0.7

5

Gasoline

1.4

7.6

Hydrogen

4

75

Kerosene Jet A-1

0.7

5

Methane / LNG

5

15

Propane

2.1

10.1

In its liquid state, LNG is not explosive, and the associated vapor cloud is not explosive if it is not in a confined or congested area.  Although a large amount of energy is stored in LNG, it cannot be released rapidly enough if released into the open environment to cause the overpressures associated with an explosion.

Furthermore, recent LNG hazard studies have discounted Boiling Liquid Expanding Vapor Explosion (BLEVE) hazards associated with LNG vessels. This is because LNG vessels have differently designed tanks than those used for gasoline and LPG, and it has been demonstrated that the combination of physical barriers makes direct thermal input to the LNG inner tank more limited.  In the event that direct thermal input does reach the LNG inner tank of an LNG vessel, it is unlikely that these tanks would rise to a pressure sufficient to cause a large flash of liquid and consequent BLEVE event.