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Process Safety & Design

Course Purposes

The Process Hazard Analysis (PHA) method is a Process Hazard Analysis tool. The method utilizes the hazardous events, event severity, initiating causes and initiating likelihood data developed during the Hazard and Operability analysis (HAZOP).

Course Objectives:

By end of the courses, candidates will learn:
  • When and how to use PHA
  • How to identify which scenarios from a HAZOP or other qualitative analysis could benefit from PHA
  • How to systematically create risk scenarios for new processes or for existing processes under change
  • How to establish risk acceptance (risk tolerance) criteria for use within your company (this is also called development of ALARP criteria) and how to depict this in a Risk Matrix or in a formula
  • How to estimate the frequency of the initiating event
  • How to determine the consequence for the scenario (unmitigated)
  • Understand what is meant by “independence” and “uniqueness” with respect to the safeguard layers (IPLs)
  • How to use PHA to determine the Safety Integrity Level (SIL)
  • How to document PHA
  • Decide which PHA/HAZOP recommendations to reject and which to accept
  • Focus limited resources within mechanical integrity departments and operations on what is critical to manage risk to ALARP

Course Contents

  •   Introduction to PHA
  •   Learning objectives and goals of using the PHA technique
  •   What is PHA? How is PHA applied? Definitions
  •   Where does PHA fit with other hazard evaluation and risk assessment methods
  •   Developing PHA Scenarios
  •   Selecting candidate scenarios from qualitative (brainstorming) hazard evaluations
  •   Scenarios from design questions and from incidents
  •   Deciding on the right cause-consequence pair to define each scenario
  •   Estimating the Consequence of the Scenario
  •   Using a look-up table of consequence
  •   Developing a consequence look-up table for your company
  •   Alternative methods for estimating consequences
  •   Workshop 1: Estimating the consequence of a scenario - part of a continuing example
  •   Estimating the Likelihood of the Selected Initiating Event
  •   Using a look-up table of initiating event categories and frequencies
  •   How to develop an initiating event look-up table for your company
  •   Addressing enabling conditions and time-dependent initiating events
  •   Workshop 1: Estimating the frequency of an initiating event of a scenario-part of a continuing example
  •   Estimating the Probability of Failure of Independent Protection Layers
  •   Definitions, rules, and exceptions for giving credit for an independent protection layer - IPL
  •  Using a look-up table of IPL categories and probability of failure on demand - PFD
  •   Workshop 1: Deciding which safeguards are valid IPLs and estimating the PFD of the valid IPLs - part of a continuing example
  •  Using a standardized PHA worksheet
  •   Rules for calculating risk for an individual scenario - PHA
  •   Rules for summing risk of related scenarios - for special applications
  •   Workshop 1: Calculating the risk of a PHA scenario - part of a continuing example
  •   Judging the Risk
  •   Examples of risk tolerance criteria from the industry
  •   Development and implementation of a company risk tolerance criteria , and possible liability issues related to documenting a risk tolerance criteria
  •   Workshop 1: Judging the risk of a PHA scenario,part of a continuing example
  •   Workshop 2: Performing a PHA from beginning to end, given a PHA scenario
  •   Workshop 3: Performing several PHA, beginning with a set to HAZOP tables and deciding which scenarios need PHA
  •   Using PHA for facility siting questions
  •   Using PHA to select the SIL for a safety interlock
  •   Workshop 4: Estimating the composite risk for facility siting risk assessment\
  •   Planning your path forward with PHA
  •  Conclusion & summary
  •   Evaluation

Course Recipients

This course is designed for
  •  experienced PHA/HAZOP leaders and builds on risk judgment skills learned while doing qualitative risk reviews. However, others who do qualitative, semi- quantitative, and fully quantitative risk assessments will benefit from learning this quicker, simpler method for estimating risk.
  • Only individuals with a strong technical background (such as engineers and scientists) should attend. Others who may benefit from this course include:
  •  Managers – Operations, Safety
  •   Project Managers
  •   Engineers – Process, Safety, and Mechanical
  • PSM Coordinators and Managers


5 Days

Methodology of teaching

Classroom lectures & Videos


Core Certificate

Available DATE

Duration Start End
5 Days 2018-01-14 2018-01-18 Apply

5 Days 2018-03-11 2018-03-15 Apply

5 Days 2018-04-15 2018-04-19 Apply

5 Days 2018-07-22 2018-07-26 Apply

5 Days 2018-09-23 2018-09-27 Apply

5 Days 2018-10-14 2018-10-18 Apply

5 Days 2018-11-04 2018-11-08 Apply

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