Chemical Hazards Engineering Fundamentals (CHEF) | AIChE

Chemical Hazards Engineering Fundamentals (CHEF)

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CHEF includes an Excel Calculation Aid to help users understand and utilize the correlations used to model and evaluate estimated airborne quantities, vapor dispersions, and explosion overpressures and their impact. These correlations provide the basis for the Risk Analysis Screening Tool (RAST).  The CHEF Calculation Aid and RAST provide a bridge between the qualitative approach and quantitative approach to risk analysis, before it invests in complex, detailed quantitative hazards and risk assessments (e.g., Quantitative Risk Assessments, QRAs).

You may also be interested in the Risk Analysis Screening Tool (RAST) course. 

  • Develop familiarity with concepts and simple methods such that Hazard Evaluation Teams, with the help of Facilitators, Technology Experts, and Process Safety Specialists, should be able to perform screening level Hazard Identification and Risk Evaluations.
  • Demonstrate the models used in the CHEF Calculation Aid spreadsheet.
  • Document the methods utilized in the Risk Analysis Screening Tools (RAST) spreadsheet.
  • Understand the limitations of the methodologies and when to utilize more advanced methods or to engage a Subject Matter Expert.

Personnel performing screening level hazard and/or risk analyses for existing and future manufacturing facilities. Manufacturing personnel, process research engineers, process design engineers, and other process safety staff will also benefit.

Day 1:

What Are the Hazards?

  • Flammability Hazards
  • Toxicity Hazards
  • Reactivity Hazards
  • Other Hazards

What Can Go Wrong?

  • Inherently Safer Design
  • Hazard Evaluation Techniques
  • Hazard and Operability Study (HAZOP)
  • Development of Incident Scenarios

How Bad Could It Be?

  • Source Models
  • Vapor Dispersions

Day 2:

How Bad Could It Be? (Continued)

  • Explosions
  • Impact Assessment

How Often Might It Happen?

  • Frequency Evaluation
  • Overview of Risk Analysis

Is the Risk Tolerable?

  • Scenarios, Enabling Conditions and Conditional Modifiers
  • Procedures and Human Performance
  • Preventive Safeguards/Protection Layers
  • Mitigating Safeguards/Protection Layers

Application and Case Studies

Day one

  • Recognizing Process Hazards
  • Chemical and Process Hazards 
  • Hazard Screening
  • Identifying Hazard Scenarios
  • Hazard ID Techniques
  • When to Perform
  • Key Process Information
  • Scenario Based Hazard Identification
  • Introduction to Risk Analysis
  • Risk Definition and Measures
  • Introduction to CHEF Calculation Aid

Day Two

  • Estimating Hazard and Damage Distances
  • Airborne Quantities
  • Vapor Dispersion Analysis
  • Explosions
  • Estimating the Severity of Consequences to People, Facilities, and the Environment
  • Impact Analysis
  • Likelihood Evaluation
  • Overview of Layer of Protection Analysis

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  • Course ID:
  • Source:
    CCPS - Center for Chemical Process Safety
  • Language:
  • Skill Level:
  • Duration:
    2 days
  • CEUs:
  • PDHs:
  • Accrediting Agencies:
    New Jersey
    New York