Dust Enclosures for 

Combustible Dusts

Many times the terms for the enclosure can be just as confusing as the terms for the dust characteristics.  Below I will give some basic definitions of the most common terms.

Vented Explosion Pressure (Pred)

-The maximum pressure developed in a vented enclosure during a vented deflagration

Enclosure Strength (Pes)

-Up to two-thirds the ultimate strength for low-strength enclosures; for high strength enclosures the enclosure design pressure sufficient to resist Pred.

Ultimate Strength

-The pressure that results in the failure of the weakest structural component of an enclosure.

Static Activation Pressure (Pstat)

-Pressure that activates a vent closure when the pressure is increased slowly (with a rate of pressure rise less than 0.1 bar/min = 1.5 psi/min).

Air–Material Separator (AMS)

-A collector designed to separate the conveying air from the material being conveyed.

Air-Moving Device (AMD)

-A power-driven fan, blower, or other device that establishes an airflow by moving a given volume of air per unit time.

Enclosure

-A confined or partially confined volume.