Loss functions and their applications in process safety assessment
2014
Process deviations, along with failure of control systems
and protection layers, result in safety and quality loss in plant
operations. This article proposes an operational risk-based
warning system design methodology based on overall system
loss. Loss functions (LFs) are used to define the relationship
between process deviations and system loss. For this purpose,
properties associated with quadratic LF and a set of inverted
probability LFs are investigated and compared. The results
suggest that LFs can be used in a novel way to assess operational
stability and system safety. The proposed consequence
assessment methodology using LFs is then incorporated into a
risk-based warning system design model to analyze warnings
associated with process deviations. A simulated case study is
presented to demonstrate potential application of the proposed
methodology; the study examines the response to a temperature
surge for a reactor system.
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