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Related Experiment Videos

A simple graphical method for measuring inherent safety.

J P Gupta1, David W Edwards

  • 1Department of Chemical Engineering, Loughborough University, LE11 3TU, Loughborough, UK. jpg@iitk.ac.in

Journal of Hazardous Materials
|November 7, 2003
PubMed
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A new method simplifies measuring inherent safety (ISD) in chemical processes by comparing hazard parameters across different routes. This approach avoids combining disparate risks, offering a clearer comparison for safer production design.

Area of Science:

  • Chemical Engineering
  • Process Safety
  • Risk Management

Background:

  • Inherently Safer Design (ISD) concepts have been recognized for over 20 years, gaining global traction after major industrial accidents in the 1980s.
  • Existing methods for measuring ISD are often too complex for industrial adoption, despite a clear industry demand for simpler assessment tools.
  • Simplification is a core principle of ISD, highlighting the need for an accessible measurement procedure.

Purpose of the Study:

  • To propose a simplified procedure for measuring the inherent safety characteristics of chemical processes.
  • To provide a method that can differentiate between multiple process routes for the same end product based on safety.
  • To offer a more scientifically appropriate alternative to methods that combine disparate hazard indices.

Main Methods:

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  • Consider key safety parameters (temperature, pressure, toxicity, flammability) and their potential ranges for each process step and route.
  • Plot these parameter ranges for comparison across different process routes.
  • Avoid summing values for different types of hazards (e.g., temperature, pressure, inventory) to maintain clarity and scientific rigor.

Main Results:

  • The proposed method allows for a direct comparison of safety profiles across different process routes without the need for complex calculations or combining dissimilar units.
  • Demonstrated on six routes for methyl methacrylate production, the method highlights how decisions might differ from those based on aggregated hazard indices.
  • The approach facilitates identification of specific process changes to reduce unsafe features.

Conclusions:

  • The developed ISD measurement procedure is simple, scientifically sound, and suitable for industrial application.
  • It effectively differentiates process safety by visualizing hazard ranges, avoiding the pitfalls of summing disparate risks.
  • The method offers a foundation for future expansion to include economic, regulatory, environmental, and occupational health factors.