Omega 31 - Methods for assessing and preventing accidental risks

This document provides a comprehensive overview of the current state of knowledge regarding confined gas and vapor explosions. As a complementary report to the Ω32-UVCE report on unconfined explosions, it focuses on gas and vapor explosions. The particularities of confined dust explosions and hybrid mixtures explosions are only briefly addressed.
This document is structured on 3 chapters that present:

• Lessons learnt from significant accidents that illustrate the sequence of a confined explosion,
• the necessary conditions for a confined explosion to occur, the main parameters that influence the main parameters that  influenceing on the environment,
• a synthesis of the main methods available to estimate the overpressure effects generated by a confined explosion and their limitations.

This document does cover the modeling of the unconfined explosion phenomenon, which is addressed in the Ω32-UVCE report.