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Brush / Spark (Static) discharge

A brush discharge is a type of corona discharge that takes place between two electrodes embedded in a non-conducting medium (e.g. air at atmospheric pressure) and is characterized by non-sparking, faintly luciferous furcations composed of ionized particles.

Brush discharges can occur from charged insulating plastics (for example polyethene) to a conductor. The maximum energy associated with brush discharges is unlikely to exceed 4 mJ. Such discharges may be incendive but are less likely to cause ignition of a solvent-air mixture than an electrostatic discharge between two conductors.

A spark discharge is another form of electrostatics which occurs between two conductive bodies carrying different potentials.

Clean air side

Part of plant after a dust separator which should contain dustfree air.

Dirty air side

Inlet side of a dust separator containing dust laden air.

Double gate valve

An arrangement consisting of two gate valves with a coupled operation such that one of the two valves is always closed. In this way the propagation of an explosion from one vessel into another can be prevented. The valves must be automatically stopped in the event of a fire or explosion to prevent the transmission of burning material.

Effectiveness as ignition source for mixtures with air of

table effectives

Explosible dust | air mixture

Mixture of combustible dust and air through which burning completely propagates after being ignited.

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