Explosion Suppression 2
Explosion Suppression 2 : Even if an explosion is initiated it is sometimes possible to prevent further propagation of the explosion by projecting an inert material or inhibitor ahead of the explosion or by taking other measures. Explosion detectors are used of varying types, e. g. a rate of increase of pressure switch which closes an electrical contact very early in the pressure growth during an explosion or a photoelectric cell explosion detector. The explosion detectors can initiate all or some of the following protective actions: (1) suppression of the explosion within the plant. This involves the rapid dispersal of a suppressant such as a vaporizing liquid extinguishing agent, an inert gas or powder which will extinguish the explosion flame before the pressure in the system has risen to a dangerous level. (2) venting the plant automatically. Vents are opened automatically by the pressure of the explosion, the necessary sizes of the vents can be calculated. The fire will continue to burn. (3) advance inerting of the plant. Usually an inert gas is used such as nitrogen, carbon dioxide or flue gas. Stone dust is used in mines. The inerting medium is released to adjacent units to prevent explosion. (4) isolation of the affected section. Valves which close rapidly by the use of explosive are used to isolate the vessel in which the explosion occurred. It may be possible to cause the explosion to be diverted through branch ducting to the atmosphere. (5) automatic shut down of the plant. The plant shuts down and a warning is given that an incident has occurred
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