Propagation of explosion

Ability to Propagate Detonation Transmission of Detonation or Extent of Propagation of Explosion. See Vol 1, p VII... 

N. Man son, La Theorie Hydrodynamique et le Diametre Limite de Propagation des Ondes Explosives (Hydrodynamic theory and the maximum limiting diameter of propagation of explosion waves), pp 586—92... 

In other words, investigation of explosives involves a study of these aspects. For example, an investigation of the potential energy involves study of thermochemistry of the chemical compound in question. Further, the power and sensitiveness of an explosive depend on properties such as heat of formation and heat of explosion . An investigation of the feature (2) involves measurement of the rate of propagation of explosion waves and all phenomena in the proximity of detonating mass of the explosive. This rate of decomposition largely determines the pressure... 

Extent of Propagation of Explosion. See Ability to Propagate Detonation in this section Exudation(or Sweating) Tests(Exsudation Esaais, in Fr) (Ausschwitzungoproben, in Ger). The purpose of the exudation test is to determine whether expls, such as dynamites, DKT, TNT, etc would release any li j in storage, especially in hot climates... 

Transmission of Detonation Through Explosive Chorge(Extent of Propagation of Explosion). See Ability to Propagate Detonation, in this section /... 

A small diameter of the tube to be filled with the explosive favours a low rate of explosion. If this is very small, (a few millimetres) the velocity of propagation of explosive decomposition may be reduced to 700 m/sec, and is variable, so that the process cannot be regarded as detonation. 

In the early literature one may find isolated fragmentary accounts of shock waves with a propagation velocity equal to D. Thus, Vieille [26] in a note emphasizing the role of discontinuities (of shock waves) in the propagation of explosions for the detonating gas 2H2 + 02 (speed of sound 510 m/sec, detonation velocity 2800 m/sec) finds the pressure in a shock wave of the same velocity equal to 40 atm and further discusses the possibility of attaining such a pressure in combustion without a change in the volume of a gas which has been previously compressed to several atmospheres. 

Ability to Propagate Detonation Transmission of Detonation or Extent of Propagation of Explosion. The prop erty of an expl to conduct detonation, which has been started by an initiator, to neighboring layers is depend ent on the props of the expl mainly velocity of deton and on some other factors(such as confinement, thickness of layer, diam of charge, density of packing, and temp) (Ref 1,3,4,5 6)- In some substs(such as AN), the deton wave might easily die out(or dampen) if the optimum conditions for propagation are not fulfilled... 

Hole Volume and Propagation of Explosion", Kogyo Kayaku (J. Ind. Explosives Soc. 

We propose the fowllowing criterion based on our evaluations. The propagation of explosions was clearly confirmed by the swing length of 10, 20 and 30g samples. 

The propagation of explosions for organic peroxides was evaluated by the swing length corresponding to... 

Table 3.43 Comparison of the test methods for propagation of explosion between ballistic pendulum and others.

First, sheet corrugated board was shown to perform well in absorbing shock in tests in which three sheets of corrugated board were put into a small case and the cases used as shock absorbers for preventing the propagation of explosion from a detonator. Second, the safety of the new package was shown by applying the United Nations classification tests for explosives. 

If there is no effect of the Neumann jet, the results are similar to those of the single package test no propagation of explosion or burning was observed. The situations after the tests are shown in Fig.5.11 and Fig.5.12. 

Buffer materials to ease the effects of shock waves and the safest distance between units to prevent the propagation of explosion. 

Before the critical distances for the propagation of explosions in sand are measured, one must find one of the most sensitive explosives in use today. If one knows the distance needed between two samples of this most sensitive explosive to insure that no propagation takes place, other less sensitive explosives will not experience propagation of explosions if separated by this critical distance. 

Because there are about 100 No. 6 detonators in the storage shed in question as well as other explosives, the propagation of explosions in sand was examined for detonators and dynamite. Fig. 5.20 shows that the samples were laid in the sand. In spite of the initiation of detonators, the dynamite did not propagate an explosion. The dynamite was in vinyl chloride tubes (VP-30), and these tubes were not damaged. This demonstrated that there were only small shock waves felt against the tubes. 

To avoid any propagation of explosions starting in the interior of the analyser s enclosure through the gas piping, flame arrestors shall be fitted at the gas inlet and outlet. These flame arrestors may be, e.g., concentric tubes... 

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