Tool design with unique components and operating characteristics, which differentiate it from other tool designs of the same type.

Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards


SSSV equipment with unique components and operating characteristics which differentiate it from other SSSV equipment of the same type. NOTE The same model can have any of a variety of end connections.

Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards


A model is defined as a physical, mathematical, or otherwise logical representation of a system, entity, phenomenon, or process [81].

Source: API TR 1PER15K-1, Protocol for Verification and Validation of High-pressure High-temperature Equipment, First Edition, March 2013. Global Standards



Approximation, representation, or idealization of selected aspects of the structure, behavior, operation, or other characteristics of a real-world process, concept, or system

Sample Usage: To assess risk for over 400 events, analysts created a model based on only the most important factors.

Source: DHS Risk Lexicon, U.S. Department of Homeland Security, 2010 Edition. September 2010 Regulatory Guidance

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