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Locations Dates Duration Tuition
Houston, TX July 31, 2020 1 day $845
Amsterdam, The Netherlands October 16, 2020 1 day £770 or €890
Houston, TX November 6, 2020 1 day $845
Singapore, Singapore December 18, 2020 1 day $900

Course Description:

Process safety decisions must be made with reference to risk tolerance criteria. Increasingly, risk analysis methods and codes, standards and regulations around the world are moving towards the use of numerical criteria, for example, with the use of Layers of Protection Analysis (LOPA) and standards for safety instrumented systems such as IEC 61511 / ISA 84. Various issues must be addressed if such criteria are to be set correctly and used meaningfully.

This training course covers the issues that must be addressed in setting risk tolerance criteria and the pitfalls that can be encountered in using them. Participants are taught a procedure to use in setting criteria for their process safety studies.


Be able to set numerical risk tolerance criteria and use them with risk analysis methods such as Layers of Protection Analysis (LOPA) and to comply with standards such as IEC 61511 and ISA 84 for safety instrumented systems.

Target Audience:

Facility personnel who are responsible for establishing risk tolerance criteria for a company and personnel involved in conducting or using studies that employ them. 


A technical background is necessary.

Course Contents:

  • Overview
  • Risk to people
  • ALARP principle
  • Establishing a foundation for criteria
    • Receptors
    • Consequence endpoints
    • Impacts
    • Form of criteria
    • Sources of risk
    • Applicable entities
    • People at risk
    • Process age
    • Risk qualities
    • Basis for values
    • Stakeholder input
    • Review and updating of criteria
  • Procedure for setting criteria
  • Allocation of criteria
  • Calculation of risk
    • Type and form of risk estimates
    • Events with multiple casualty types
    • Conflicting criteria
    • Changes in risk
    • Transient populations
    • Delayed effects
    • Overlapping hazard zones
    • Uncertainties in risk estimates

Duration / Credits:

  • One day
  • 0.7 CEUs or 7 PDHs awarded


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