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Worst Case Scenario Calculation

Robert B. Coulter, P.E.

Course Outline

This two-hour online course explains a method for calculating Worst Case Scenarios (WCS) in order to comply with EPA's Chemical Accident Prevention Provisions, 40 CFR Part 68 or the general duty clause of the Clean Air Act 112(r)(1).

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

Learning Objective

At the conclusion of this course, the student will:

Have a basic understanding of the calculation of worst cast scenarios

About the Author

Robert B.Coulter, PE, is a provider of safety, process engineering and environmental consulting services including inhouse training on safety and environmental topics. For more information, visit his website at

Course Introduction

This course explains a method for calculating worst case scenarios. The method comes from an EPA document entitled "Risk Management Program Guidance for Offsite Consequence Analysis" which is available for free (see the link below) from the EPA. Many facilities are required to calculate worst case scenarios for their facilities to comply with 40 CFR part 68. Other facilities may want to calculate worst case scenarios as part of a hazard assessment and reduction program.

Course Content

The main course content can be found at the link below. You will need the Adobe Acrobat reader installed on your computer to view this content.

Worst Case Scenario Calculation - Main Course Content  

You may need to download Acrobat Reader to view and print the document.

Summary and Conclusions

A methodology for modeling worst case scenarios was shown. This included a method for modeling toxic liquid and gas releases and a method for modeling explosions of flammable substances. The student may also want to further review the related links below. After reviewing the course material the student should be ready for the test.

Related Links

The following are pertinent links for this course:

CAP - Chemical Accident Prevention Provisions - EPA Rule 40 CFR Part 68
OCAGD - "Risk Management Program Guidance for Offsite Consequence Analysis"

Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.

Take a Quiz

DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered professional engineer. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.