How to determine whether a flame arrester needs to be of the deflagration suppression type or the detonation suppression type?

It is related to the installation position of the ignition source relative to the flame arrester, and the properties of the material also need to be taken into account. It is recommended to consult the supplier

The differences and applications between flame arrestors designed to prevent deflagration and those designed to prevent detonation: In the professional terminology related to flame arrestors, flame arrestors designed to prevent deflagration (Figure 1) and those designed to prevent detonation (Figure 2) are terms that appear frequently. Both are common types of pipeline flame arrestors, but they differ in terms of structure, performance, and usage; they should not be confused with one another, as this would significantly reduce their effectiveness in preventing fires； Structurally, the flame arrestor core layer of the blast suppression type has a greater thickness than that of the deflagration suppression type, resulting in a higher flame arrestment level ； Based on the principles of gas combustion, gas explosions have two types: deflagration and detonation ； In the deflagration type, oxygen is supplied to the front of the explosion to control the combustion rate, and this front propagates through the unburned gas at subsonic speed. The transmission mechanism is the heat transfer effect. In deflagration, the combustion reaction relies heavily on heat and mass diffusion in the energy release region ； In the detonation type, combustion is initiated by the pressures and temperatures associated with shock waves, and it propagates through the reactants at supersonic speeds. Propagation is attributed to the compression effect (heating of the unreacted gas in front of the propagation front through shock compression). Detonation generates high pressure and is usually far more destructive than deflagration ； The structural differences, flame arrestment ratings, and applications of the two are shown in the table below: Flame Arrestor Structure Type: Flame explosion prevention type flame arrestor, Blast explosion prevention type flame arrestor. Flame Arrestment Ratings: IIB, IIC. Applications: Vent pipes, gas pipelines, pipe ends; pipelines subject to blast explosions, middle sections of pipelines. Safety gap MESG values: 0.5 < MESG < 0.9; MESG ≤ 0.5. (Figure 1: Blast explosion prevention type flame arrestor) (Figure 2: Flame explosion prevention type flame arrestor)

This post was last edited by goldliyang on 2020-7-6 at 09:25. The key factor is the distance between the flame arrester and potential ignition sources, and it is also necessary to consider the explosion group of the specific medium.