In-line detonation flame arresters offer protection against high flame velocities, where the velocity is supersonic and is accompanied by a shock wave. Detonation flame arresters are designed and tested for overdriven (unstable) detonations where the flame speed exceeds the speed of sound and the explosion pressure is significantly higher than in a stable detonation. Therefore there are usually no restrictions on their location in the process line.
 

End of line flame arresters can also be supplied endurance burn proof and this type of arrester is often used on storage tanks where long filling and thermal breathing can be present and the flow of the flammable mixture cannot be stopped.