Explosion protection comparison

Comparison of E] q)losion Protection Design Measures In Table 26-24, comparison is made of the explosion protection design measures of containment, explosion venting, and explosion suppression. Regarding the effectiveness of the different explosion design measures, all three techniques are equal if the design of these measures is performed properly. 

TABLE 26-24 Comparison of Explosion Protection Design Measures... 

Table 6.22 Comparison of a non-explosion protected motor with (E)Ex eh design (rated synchronous speed 1500 min-1, frame number 132,50cps, totally enclosed/fan cooled) (by courtesy of Loher GmbH, Ruhstorf/Germany)...

In zone 2, the pressurization technique presents the greatest allowable bandwidth in selecting the electrical components to be installed inside an explosion protected enclosure in comparison with other types of explosion protection techniques as stated in IEC 60079-15, EN 50021 or VDE 0165. As a special feature, pressurization enables intervention and access of personnel... 

Toxic chemical munitions have unique characteristics in comparison to other weapons systems, reaching personnel both widely dispersed and concentrated in fortifications, ie, gases and aerosols are not bound by corners. These materials can penetrate crevices reaching personnel physically protected from high explosives. In addition, toxic chemicals are minimum-destmction weapons as regards matHriel (5). 

Increased vigilance regarding security to protect against terrorist use of weapons of mass destruction, including especially explosive devices, as well as an increased interest in the comparison to the explosive detection capabilities of instrumental technologies, has led to increased scrutiny of canine explosive detection capabilities. 

By the end of the WWI, some 124,200 tons of chemical warfare agents (chlorine, phosgene, mustard, etc.) had been released, causing at least 1.3 million casualties of which more than 90,000 were fatal. The threat of the use of CWAs led to the development of protective means not only for humans, but also for horses and dogs. The effectivity of CWs in comparison with classic munition was evident 1 ton of classic explosives caused 4.9 casualties 1 ton of chemical munition caused 11.5 casualties and 1 ton of yperite caused 36.4 casualties (Bajgar, 2006). 

Explosion suppression can be a very elegant method to prevent dust explosions. This method utilizes the fester propagation of the pressure wave in comparison to the flame fix>nt. The vessel to be protected is equipped with containers comparable in size and design to fire extinguishers. They are filled with a substance which suffocates the fire in a comparable way to powder extinguishers. 

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