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Vapor Cloud Explosion

This document discusses vapor cloud explosions (VCEs) that can occur when flammable gases ignite. It notes that a flash fire with low overpressure may occur if the vapor cloud is less than 5 tons. A fast explosion between 0-5 seconds can happen if ignition is delayed for 5-10 minutes. The equivalent TNT mass that represents the explosive power can be calculated using the formula provided. Detonations may occur if the open vapor interacts with structures, producing high local pressures, and can be initiated by detonators or explosive weapons.

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Sywie ARydivolya
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33 views5 pages

Vapor Cloud Explosion

This document discusses vapor cloud explosions (VCEs) that can occur when flammable gases ignite. It notes that a flash fire with low overpressure may occur if the vapor cloud is less than 5 tons. A fast explosion between 0-5 seconds can happen if ignition is delayed for 5-10 minutes. The equivalent TNT mass that represents the explosive power can be calculated using the formula provided. Detonations may occur if the open vapor interacts with structures, producing high local pressures, and can be initiated by detonators or explosive weapons.

Uploaded by

Sywie ARydivolya
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
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VAPOR CLOUD

EXPLOSION

Characteristic of VCE
1.

2.

3.

4.
5.

Flash Fire may occur, that is low


deflagration without increasing the
overpressure.
Impossible if the amount of vapor cloud
less than 5 ton.
Fast Explosion(0 5 s), for ignition is
delayed (5-10) min.
Small Explosion Efficiency
Power of Explosion Effect = The Equivalent
TNT mass.

The equivalent TNT mass (Kg)


a. TNT mass
M

TNT

(1)

Where:
G (kg) - mass of the flammable gas .
c - heat of combustion flammable gas.
- heat of combustion of .

-coefficient arbitrarily taken as 0.1.

MTNT= Eq TNT
mass(kg)
X = Distance (m)
Ps =
Overpressure(bar)

6. Detonation open vapor may occur


Occur blast wave interaction with
structures that provide high local pressure.
There are others detonator who initiate
detonation in a cloud of steam.
For example : Fuel air explosive weapon

Falling of bom use Parachute


Bursting Charge
Detonation

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