CONTROL SYSTEM HAZARD AND OPERABILITY STUDY (CHAZOP): A Deep Dive

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About Course

  • INTRODUCTION TO THE COURSE

PHA150 is a self-study training course on Control Systems HAZOP (CHAZOP), presented by xSeriCon. This is a modular course: you can select and study the modules you are interested in, although the course will be more effective if you complete all modules in order.

The course is interactive, and you will be provided with an xSeriCon tutor to discuss your learning and any questions you have. Exercises are included in each module: they are there to deepen your learning and confirm your understanding. Suggested answers are provided at the end of each module.

This course on CHAZOP is designed for professionals in the process industry and assumes you have at least a little previous knowledge of process-related hazard and risk management.

All the key concepts will be introduced and explained, so do not worry if you are not experienced in this area.

For more information about the course, please contact xSeriCon via info@xsericon.com or the contact page of www.xsericon.com

  • WHAT THE CHAZOP COURSE COVERS

MODULE 1: Concept of CHAZOP

• Objective and Scope of CHAZOP

• Information provided by CHAZOP

• What types of control system risk analysis are available?

MODULE 2: CHAZOP Input Data and Procedure

• Typical Input Data problems for conducting CHAZOP

• Pre-screening of HAZOP report

• CHAZOP Procedure

• CHAZOP Methodology for continuous operations

• CHAZOP Methodology for batch or sequence operations

• Roles of chairman and scribe


MODULE 3: CHAZOP Methodology, Execution and Recording of the Study

• Executing a CHAZOP workshop: functional areas and failure classes

• Risk ranking

• Recording the CHAZOP study

• Reporting the CHAZOP study


MODULE 4: CHAZOP example in detail

• Detailed checklists: continuous and batch mode CHAZOP

• Example: using input data to generate the CHAZOP worksheet

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Course Content

CONTROL SYSTEM HAZARD AND OPERABILITY STUDY (CHAZOP): A Deep Dive
MODULE 1: Assessing the risks of control system failure

  • INTRODUCTION TO THE COURSE

Concepts of CHAZOP
To understand how and when to use it, we need to know the background issues: What is the objective and scope of CHAZOP? Why are we performing CHAZOP? What information and what types of control system risk analysis are available, and which is the best analysis tool for each situation? These topics, which are fundamental to a correct application of CHAZOP, are covered in this module.

Exercise: Types of control system analysis
The following questions relate to the 5 types of control system analysis discussed in the course: • FMEA, FMEDA, FMECA o FMEA: Failure Mode and Effects Analysis (failure rate and repair time identified for system/sub system/ component) o FMEDA: where automatic system fault diagnostics is considered o FMECA: where an assessment of failure criticality for system/sub system/ component is included • Continuous CHAZOP • Batch mode CHAZOP • Software integrity and criticality analysis • Human Factors Analysis (HFA)

References
1. I. Cameron and R. Raman. Process Systems Risk Management. Elsevier, 2005, page 107. 2. Out of control: why control systems go wrong and how to prevent failure, 2nd edition. HSG238, Health and Safety Executive, 2003. Free download from https://www.hse.gov.uk/pubns/books/hsg238.htm 3. P. Clarke. Assessing the risks of control system failure (white paper), 2016. Free download from https://xsericon.world/res 4. D.J. Smith and K.G.L. Simpson, Safety critical systems handbook, 3rd edition. Elsevier, 2011. Especially chapter 4 (software). 5. W.M. Goble, Control systems safety evaluation and reliability, 3rd edition. ISA, 2010. 6. F. Crawley, M. Preston and B. Tyler. HAZOP guide to best practice, 2nd edition. IChemE, 2008, chapter 10. 7. B. Skelton. Process Safety Analysis: An introduction. IChemE, 1997.

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