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Keywords:

  • layers of protection;
  • LOPA;
  • risk;
  • risk assessment;
  • initiating events;
  • independent protection layers

Abstract

Layer of protection analysis (LOPA) is a semiquantitative tool for analyzing and assessing process risk. The tool has grown greatly in popularity and usefulness since the publication of the first CCPS/AIChE guidebook on the subject, Layer of Protection Analysis, Simplified Process Risk Assessment (LOPA). This article is a summary of a new CCPS guideline book that includes the following:

  • Initiating events (IEs).

  • Independent protection layers (IPLs).

  • Criteria for identifying the value of each prospective IE and prospective IPL.

  • Example IE and IPL data.

This book is a necessary reference for those applying the LOPA methodology. © 2009 American Institute of Chemical Engineers Process Saf Prog, 2009