September 2024 | AIChE

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September 2024

Tolling

Providing manufacturing services for a fee by a contractor (the toller), to a company issuing (letting) a contract for those services. Tolled services can include, reaction processes, formulation, blending, mixing or size reduction, separation, agglomeration, packaging/repackaging, and others or a...

Toller

A contracted company that manufactures, stores, uses, handles, or transports chemical components of a facility's final products. Sometimes called third party service provider, toll processor, supplier of outside services, external contract manufacturer, contract processor, contract manufacturer,...

Toll Manufacturer

Contract manufacturer (external manufacturer).

Tolerance

A measure of the uncertainty arising from the physical and the environmental differences between members of differing equipment populations when failure rate data is aggregated to produce a final generic data set.

Tolerable Risk Level

The maximum level of risk of a particular technical process or condition that is regarded as tolerable in the context of the circumstances in questions. Ref. WHEP0.

TNT Equivalence Models

Models of explosion characteristics relating vapor cloud explosions to the explosion of an equivalent mass of TNT (trinitrotoluene).

Time Varying Continuous Release

A subset of continuous release (See Continuous Release) that the release rate varies significantly with time.

Time to Thermal Runaway

An estimation of the time required for an exothermic reaction, in an adiabatic container, (that is, no heat gain or loss to the environment), to reach the point of thermal runaway. (ASTM E 1445)

Time To Failure

The time period measured from the moment when equipment installation is complete to the equipment's inability to perform its duty or intended function.

Time Related Failure

A failure that is primarily due to the degradation over the time that a device or system is in service. For example, the failure of a pump after 2000 hours of continuous service due to wear on the bearings would be considered a time-related failure.

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