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Guidelines for Chemical Process Quantitative Risk Analysis, 2nd Edition

ISBN: 978-0-8169-0720-5
748 pages
October 1999
Guidelines for Chemical Process Quantitative Risk Analysis, 2nd Edition (081690720X) cover image
Chemical process quantitative risk analysis (CPQRA) as applied to the CPI was first fully described in the first edition of this CCPS Guidelines book. This second edition is packed with information reflecting advances in this evolving methodology, and includes worked examples on a CD-ROM. CPQRA is used to identify incident scenarios and evaluate their risk by defining the probability of failure, the various consequences and the potential impact of those consequences. It is an invaluable methodology to evaluate these when qualitative analysis cannot provide adequate understanding and when more information is needed for risk management. This technique provides a means to evaluate acute hazards and alternative risk reduction strategies, and identify areas for cost-effective risk reduction. There are no simple answers when complex issues are concerned, but CPQRA2 offers a cogent, well-illustrated guide to applying these risk-analysis techniques, particularly to risk control studies.

Special Details: Includes CD-ROM with example problems worked using Excel and Quattro Pro. For use with Windows 95, 98, and NT.

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Preface to the First Edition.


Acknowledgments to the First Edition.

Management Overview.

Organization of the Guidelines.



1.1 CPQRA Definitions.

1.2 Component Techniques of CPQRA.

1.2.1 Complete CPQRA Procedure.

1.2.2 Prioritized CPQRA Procedure.

1.3 Scope of CPQRA Studies.

1.3.1 The Study Case.

1.3.2 Typical Goals of CPQRAs.

1.4 Management of Incident Lists.

1.4.1 Enumeration.

1.4.2 Selection.

1.4.3 Tracking.

1.5 Applications of CPQRA.

1.5.1 Screening Techniques.

1.5.2 Applications within Existing Facilities.

1.5.3 Applications within New Projects.

1.6 Limitations of CPQRA.

1.7 Current Practices.

1.8 Utilization of CPQRA Results.

1.9 Project Management.

1.91. Study Goals.

1.9.2 Study Objectives.

1.9.3 Depth of Study.

1.9.4 Special User Requirements.

1.9.5 Construction of a Project Plan.

1.9.6 Project Execution.

1.10 Maintenance of Study Results.

1.11 References.


2.1 Source Models.

2.1.1 Discharge Rate Models.

2.1.2 Flash and Evaporation.

2.1.3 Dispersion Models.

2.2 Explosions and Fires.

2.2.1 Vapor Cloud Explosions (VCE).

2.2.2 Flash Fires.

2.2.3 Physical Explosion.

2.2.4 BLEVE and Fireball.

2.2.5 Confined Explosions.

2.2.6 Pool Fries.

2.2.7 Jet Fires.

2.3 Effect Models.

2.3.1 Toxic Gas Effects.

2.3.2 Thermal Effects.

2.3.3 Explosion Effects.

2.4 Evasive Actions.

2.4.1 Background.

2.4.2 Description.

2.4.3 Example Problem.

2.4.4 Discussion.

2.5 Modeling Systems.

2.6 References.


3.1 Incident Frequencies from the Historical Record.

3.1.1 Background.

3.1.2 Description.

3.1.3 Sample Problem.

3.1.4 Discussion.

3.2 Frequency Modeling Techniques.

3.2.2 Event Tree Analysis.

3.3 Complementary Plant-Modeling Techniques.

3.3.1 Common Cause Failure Analysis.

3.3.2 Human Reliability Analysis.

3.3.3 External Events Analysis.

3.4 References.


4.1 Risk Measures.

4.1.1 Risk Indices.

4.1.2 Individual Risk.

4.1.3 Societal Risk.

4.1.4 Injury Risk Measures.

4.2 Risk Presentation.

4.2.1 Risk Indices.

4.2.2 Individual Risk.

4.2.3 Societal Risk.

4.3 Selection of Risk Measures and Presentation Format.

4.3.1 Selection of Risk Measures.

4.3.2 Selection of Presentation Format.

4.4 Risk Calculations.

4.4.1 Individual Risk.

4.4.2 Societal Risk.

4.4.3 Risk Indices.

4.4.4 General Comments.

4.4.5 Example Risk Calculation Problem.

4.4.6 Sample Problem Illustrating That F-N Curves Cannot be Calculated from individual Risk Contours.

4.5 Risk Uncertainty, Sensitivity, and Importance.

4.5.1 Uncertainty.

4.5.2 Sensitivity.

4.5.3 Importance.

4.6 References.


5.1 Historical Incident Data.

5.1.1 Types of Data.

5.1.2 Sources.

5.2 Process and Plant Data.

5.2.1 Plant Layout and System Description.

5.2.2 Ignition Sources and Data.

5.3 Chemical Data.

5.3.1 Types of Data.

5.3.2 Sources.

5.4 Environmental Data.

5.4.1 Population Data.

5.4.2 Meteorological Data.

5.4.3 Geographical Data.

5.4.4 Topographic Data.

5.4.5 External Event Data.

5.5 Equipment Reliability Data.

5.5.1 Terminology.

5.5.2 Types and Sources of Failure Rate Data.

5.5.3 Key Factors Influencing Equipment Failure Rates.

5.5.4 Failure Rate Adjustment Factors.

5.5.5 Data Requirements and Estimated Accuracy.

5.5.6 Collection and Processing of Raw Plant Data.

5.5.7 Preparation of the CPQRA Equipment Failure Rate Data Set.

5.5.8 Sample Problem.

5.6 Human Reliability Data.

5.7 Use of Expert Opinions.

5.8 References.


6.1 Domino Effects.

6.1.1 Background.

6.1.2 Description.

6.1.3 Sample Problem.

6.1.4 Discussion.

6.2 Unavailability Analysis of Protective Systems.

6.2.1 Background.

6.2.2 Description.

6.2.3 Sample Problem.

6.2.4 Discussion.

6.3 Reliability Analysis of Programmable Electronic Systems.

6.3.1 Background.

6.3.2 Description.

6.3.3 Sample Problem.

6.3.4 Discussion.

6.4 Other techniques.

6.4.1 MORT Analysis.

6.4.2 IFAL Analysis.

6.4.3 Hazard Warning Structure.

6.4.4 Markov Processes.

6.4.5 Monte Carlo Techniques.

6.4.6 GO Methods.

6.4.7 Reliability Book Diagrams.

6.4.8 Cause-Consequence Analysis.

6.4.9 Multiple Failure/Error Analysis (MFEA).

6.4.10 Sneak Analysis.

6.5 References.


7.1 Simple/Consequence CPQRA Examples.

7.1.1 Sample/Consequence CPQRA Characterization.

7.1.2 Application to a New Process Unit.

7.1.3 Application to an Existing Process Unit.

7.2 Intermediate/Frequency CPQRA Examples.

7.2.1 Intermediate/Frequency CPQRA Characterization.

7.2.2 Application to a New Process Unit.

7.2.3 Application to Existing Process Unit.

7.3 Complex/Risk CPQRA Examples.

7.3.1 Complex/Risk Cpqra Characterization.

7.3.2 Application to a New or Existing Process Unit.

7.4 References.


8.1 Chlorine Rail Tank Car Loading Facility.

8.1.1 Introduction.

8.1.2 Description.

8.1.3 Identification, Enumeration, and Selection of Incidents.

8.1.4 Incident Consequence Estimation.

8.1.5 Incident Frequency Estimation.

8.1.6 Risk Estimation.

8.1.7 Conclusions.

8.2 Distillation Column.

8.2.1 Introduction.

8.2.2 Description.

8.2.3 Identification, Enumeration, and Selection of Incidents.

8.2.4 Incident Consequence Estimation.

8.2.5 Incident Frequency Estimation.

8.2.6 Risk Estimation.

8.2.7 Conclusions.

8.3 References.


9.1 Hazard Identification.

9.2 Source and Dispersion Models.

9.2.1 Source Emission Models.

9.2.2 Transport and Dispersion Models.

9.2.3 Transient Plume Behavior.

9.2.4 Concentration Fluctuations and the Time Averaging of Dispersion Plumes.

9.2.5 Input Data Uncertainties and Model Validation.

9.2.6 Field Experiments.

9.2.7 Model Evaluation.

9.3 Consequence Models.

9.3.1 Unconfined Vapor Cloud Explosion (UVCE).

9.3.2 Boiling Liquid Expanding Vapor Explosions (BLEVES) and Fireballs.

9.3.3 Pool and Jet Fires.

9.3.4 Toxic Hazards.

9.3.5 Human Exposure Models.

9.4 Frequency Models.

9.4.1 Human Factors.

9.4.2 Electronic Systems.

9.4.3 Failure Rate Data.

9.5 Hazard Mitigation.

9.6 Uncertainty Management.

9.7 Integration of Reliability Analysis, CPQRA, and Cost-Benefit Studies.

9.8 Summary.

9.9 References.

Appendix A. Loss-of-Containment Causes in the Chemical Industry.

Appendix B. Training Programs.

Appendix C. Sample Outline for CPQRA Reports.

Appendix D. Minimal Cut Set Analysis.

Appendix E. Approximation Methods for Quantifying Fault Trees.

Appendix F. Probability Distributions, Parameters, and Technology.

Appendix G. Statistical Distributions Available for Use as Failure Rate Models.

Appendix H. Errors from Assuming That Time-Related Equipment Failure Rates Are Constant.

Appendix I. Data Reduction Techniques: Distribution Identification and Testing Methods.

Appendix J. Procedure for Combining Available Generic and Plant-Specific Data.

Conversion Factors.



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