September 2024 | AIChE

Other Sites & Tools

Technical Groups

You are here

September 2024

Effect Models

Models that predict effects of incident outcomes usually with respect to human injury or fatality or property damage.

Dust Hazard Analysis (DHA)

A systematic review to identify and evaluate the potential fire, flash fire, or explosion hazards associated with the presence of one or more combustible particulate solids in a process or facility.

Dust

Any finely divided solid, 420 microns or 0.017 inches, or less in diameter (that is, material that can pass through a U.S. No. 40 standard sieve).

Dump Tank

A separate collection and containment vessel intended to receive an emergency discharge of liquids, liquid reaction mass, or slurries originating from the bottom of a process vessel or reactor. The dump is usually automatically triggered by a process safety interlock, but may also be initiated...

Dry Type Flame Arrester

A flame arrester that uses an element consisting of small gaps or apertures to quench and extinguish the flame, as distinguished from hydraulic flame arresters.

Dow Fire and Explosion Index (F&EI)

A method (developed by Dow Chemical Company) for ranking the relative fire and explosion risk associated with a process. Analysts calculate various hazard and explosion indexes using material characteristics and process data.

Dow Chemical Exposure Index (CEI)

A method, developed by The Dow Chemical Company, used to identify and rank the relative acute health hazards associated with potential chemical releases. The CEI is calculated from five factors: a measure of toxicity; the quantity of volatile material available for a release; the distance to each...

Dose

Time-integrated concentration

Domino Effects

The triggering of secondary events, such as toxic releases, by a primary event, such as an explosion, such that the result is an increase in consequences or area of an effect zone. Generally only considered when a significant escalation of the original incident results.

Diversity

The performance of the same overall protective function by a number of independent and different means.

Pages