Can explosion suppression type flame arresters replace explosion ignition suppression type flame arresters?
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This post was last edited by sjyygh on 2022-10-21 at 13:07. Dear forum members, I need help: flame arresters of the explosion-suppression type can prevent the propagation of flames that travel at speeds below the speed of sound, while those of the detonation-suppression type can prevent the propagation of explosive flames that travel at supersonic speeds and are characterized by shock waves. So when selecting a flame arrester, given the requirements related to the medium (as specified by MESG) as well as pressure and temperature conditions, can unsteady-state blast suppression replace steady-state blast suppression and flame arrestment? And can steady-state blast suppression replace flame arrestment? Thank you!
I am a professional manufacturer of flame arresters. The function of an explosion suppression flame arrester is to prevent the spread of deflagration flames, while the function of a detonation suppression flame arrester is to prevent the spread of detonation flames. Intuitively, the speed of a detonation flame is much higher than that of a deflagration flame; therefore, a flame arrester designed to stop detonations should be able to prevent the slower-moving deflagration flames, and could be used in place of flame arresters designed for deflagrations. However, during actual research and testing, it was found that when we installed the deflagration arrestor at the location where deflagration occurs to test whether it could successfully prevent the deflagration flame, it sometimes managed to do so and other times it failed to do so. In other words, a deflagration arrestor that has not undergone deflagration resistance testing cannot guarantee that it will successfully prevent deflagration. So we improved the product and conducted repeated tests; now we are able to produce flame arresters that can prevent both detonation and deflagration, and they have obtained certification. As is well known, as a special type of equipment, a flame arrester requires type test certification. The testing requirements for blast and detonation arrestors specified in the national standard GB13347 are that 13 detonation tests must be conducted consecutively, with ignition suppression succeeding in each case. The testing requirements for explosion and detonation arrestors under the international standard ISO16852 are that 5 deflagration tests and 5 detonation tests must be conducted, with successful arrest in each case. Therefore, the requirements of the international standard ISO16852 are stricter than those of the national standard GB13347, and they take more comprehensive considerations into account. For users, if what is purchased is an explosion and detonation arrestor certified under ISO16852, it can prevent both combustion explosions and detonations. If a flame arrester certified under GB13347 is purchased, it can only prevent detonation but not deflagration, as it has not been tested for deflagration.
Theoretically, it is possible; a flame with a higher flame propagation speed can be extinguished, and one with a lower speed should also be able to be extinguished
The installation location of flame arresters designed to prevent deflagration should be close to the source of fire; those designed to prevent detonation should be installed far away from the source of fire. The flame arrestor is installed at the outlet, while the blast arrestor is installed on the pipeline.
In pipelines or at pipeline ends: flame arresters designed to prevent deflagration can be tailored for use in pipelines or at their ends, whereas flame arresters designed to prevent detonation are always installed within the pipelines. The installation location of flame arresters designed to prevent deflagration should be close to the source of fire; those designed to prevent detonation should be installed far away from the source of fire.
That’s right; the explosion arrestor is installed near the fire source. If it’s replaced with an explosion detonation arrestor, will it be able to prevent explosions? Flames with a higher flame propagation speed can be extinguished; can those with a lower speed also be extinguished? Thank you
Yes, I think theoretically it is as well, but I haven’t found any concrete evidence.
Detonation can replace deflagration; detonation-type flame arresters can prevent combustion with a speed greater than the speed of sound, while deflagration-type flame arresters can prevent combustion with a speed less than the speed of sound.
Explosion suppression type flame arresters can replace explosion ignition suppression type flame arresters, and unsteady-state explosion suppression type flame arresters can replace steady-state explosion suppression type flame arresters.
Explosion suppression type flame arresters can be designed for use in pipelines or at pipeline ends, whereas explosion deflagration type flame arresters are always installed within pipelines. The installation location of flame arresters designed to prevent deflagration should be close to the source of fire; those designed to prevent detonation should be installed far away from the source of fire.