CCPS Process Safety Glossary

The highest concentration of combustible material that will propagate a...

Read More...

See Uninterruptible Power Supply.

URA

Uniform Roughness Array used at the Kit Fox experiments, consisting of...

Read More...

Because of heat generated by man’s activities and by industrial processes,...

Read More...

Synonymous with Application Program.

The portion of the PES memory reserved for the storage of Application...

Read More...

Unconfined Vapor Cloud Explosion; Explosive oxidation of a vapor cloud in a...

Read More...

In the event of instrument air or electrical power failure, valves either...

Read More...

A gas that is at a temperature below the critical temperature, so that it...

Read More...

The explosion resulting from the ignition of a cloud of flammable vapor, gas...

Read More...

Explosive oxidation of a vapor cloud in a nonconfined space (not in vessels...

Read More...

A piping system to which vessels are connected, that collects vapors from...

Read More...

The weight of a vapor or gas compared to the weight of an equal volume of...

Read More...

The pressure exerted by a vapor above its own liquid. The higher the vapor...

Read More...

The pressure exerted by a saturated vapor in equilibrium with its own liquid...

A quantity or condition whose value is subject to change and can usually be...

Read More...

See Flow Controlled Aperture.

The hardware and software suppliers of a computerized system. There may be...

Read More...

An opening for the passage of, or dissipation of, fluids, such as gases,...

Read More...

See Vapor Collection System

A group of specialized models for expressing the concentration on the roof...

Read More...

The process of supplying or removing an atmosphere to or from any space by...

Read More...

Emergency flow of vessel contents out of a vessel. The pressure is...

Read More...

The area very close to the source where the specific geometry of one or two...

Read More...

The offset in distance to the specified source of a gas or vapor release...

Read More...

This method is applied when there is a change in dispersion conditions at...

Read More...

Nonconductive liquid having a kinematic viscosity above 30–100 cS and a very...

Read More...

See “Potential.”

The voltage common to all conductors of a group as measured between that...

Read More...

The voltage at a given location between two conductors of a group.

The ratio of the volume occupied by congestion elements such as pipes, beams...

Read More...

Models that predict explosion characteristics based on the volumetric...

Read More...

An out of n redudant system which requires at least m of the n channels to...

Read More...

A timer implemented to prevent the system from looping endlessly or becoming...

Read More...

A manufacturer provided means performing specific actions if the integrity...

Read More...

An external watchdog timer is preferred to an internal watchdog timer to...

Read More...

Pages