Get access

Loss functions and their applications in process safety assessment

Authors

  • Seyed Javad Hashemi,

    1. Safety and Risk Engineering Group, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada
    Search for more papers by this author
  • Salim Ahmed,

    1. Safety and Risk Engineering Group, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada
    Search for more papers by this author
  • Faisal Khan

    Corresponding author
    1. Safety and Risk Engineering Group, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada
    2. Australian Maritime College, University of Tasmania, Launceston, Australia
    Search for more papers by this author

  • This article was presented in AIChE 1st CCPS Asia-Pacific Conference on Process Safety, Qingdao, China, September 4–5, 2013.

Abstract

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. © 2014 American Institute of Chemical Engineers Process Saf Prog 33: 285–291, 2014

Get access to the full text of this article

Ancillary