Gas Energy

We have already posted about one from two explosives energy, the shock energy. Now in this article we will learn about gas energy. However you can find the introduction to explosives engineering here¬†and the sources of explosive’s energy here.

Gas energy explanation

The gas energy released during the detonation process causes the majority of rock breakage in rock blasting with charges confined in boreholes. The gas energy pressure often called explosion pressure. Explosion pressure is the pressure that is utilise on the borehole walls by the expanding gases after the chemical reaction has been complete. Explosion pressure results from the amount of gases liberated per unit weight of explosive and the amount of heat liberated during the reaction. The higher the temperature produced, the higher the gas energy pressure. If more gas volume is liberated at the same temperature, the pressure will also increase. For a quick approximation, it is often assumed that explosion pressure is approximately one-half of the detonation pressure.

 

Detonation and explosion gas energy pressure graphic
Nomograph of Detonation and Explosion Pressure

Gas energy/explosion pressure

It should be note that this is only an approximation and conditions can exist where the explosion pressure exceeds the detonation pressure. This explains the success of ANFO which yields a relatively low detonation pressure, but relatively high explosion pressure. Gas energy/explosion pressures are measurable from computer codes or measured using underwater tests. Explosion pressures also be measurable directly in boreholes. However, few of the explosive manufacturers use the new technique in rating their explosives. A review of some very basic explosives chemistry helps one to understand how powdered metals and other substances effect explosion pressures. Rather we will

 

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