Hazop And Hazan Notes On The Identification And Assessment Of Hazards

Hazop and Hazan were developed to identify and assess hazards in the process industries. The use of these techniques leads to safer plants. Understanding the practical issues involved in their correct implementation is the theme of this book.

This revised edition provides the basics of applying hazard and operability study (Hazop) and hazard analysis (Hazan). Hazop is a creative but systematic method of identifying hazards in process plants. Hazard analysis is then used to quantify the risks from these hazards, and to assess how far to go in reducing them. This book is presented in easy-to-read style and explains: what a Hazop is, who carries it out, when, and how long it should take; points to watch during a Hazop; an example of a Hazop; Hazops on flowsheets; the stages of Hazard analysis; the Fatal Accident Rate; risks to the public; estimating how often an accident will occur, with examples; and pitfalls in Hazan.

Examines the use of practical techniques to implement process safety in new and existing plants. The author's incident scenario model enables selection of a suitable hazard identification technique. Pre-Hazop and Hazop techniques are explained in detail and demonstrated by case studies.

Contents: Introduction, Qualitative Methods of Risk Assessment, Quantitative Methods of Risk Assessment-I: Consequence Analysis, Quantitative Methods of Risk Assessment-II: Rapid Risk Assessment, Quantitative Methods of Risk Assessment-III: Probabilistic Hazard Assessment, Studies on Chain, of Accidents (Domino Effects), Methods of Hazard Identification, Screening and Ranking, Application of Risk Analysis in Process Design.

This unique manual is a comprehensive, easy-to-read overview of hazards analysis as it applies to the process and allied industries. The book begins by building a background in the technical definition of risk, past industrial incidents and their impacts, ensuing legislation, and the language and terms of the risk field. It addresses the different types of structured analytical techniques for conducting Process Hazards Analyses (PHA), provides a "What If" checklist, and shows how to organize and set up PHA sessions. Other topics include layout and siting considerations, Failure Modes and Effect Analysis (FMEA), human factors, loss of containment, and PHA team leadership issues.