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Reactivity Expert System for Recognizing Reactivity Hazards

Recognizing reactivity hazards of pure chemicals and mixtures is critical for managing risks in processing industries, emergency response activities, and waste treatment facilities. A binary interaction matrix is a simple tool for summarizing reactivity information and it is always a good practice to generate compatibility matrix for the system of interest. The generation of such matrix is a complex task and may involve several man-hours. This paper discusses reactivity expert system, a computerized algorithm that has several databases of interactions and generates compatibility matrix between chemicals. The reactivity expert system also displays available regulatory and toxicity information for a chemical, if available. We applied the reactivity expert system as a screening tool for 167 CSB incidents and it successfully screened 126 of 127 incidents where chemicals involved were specified. Read more

Reactivity Screening Made Easy

This presentation provides guidance on a systematic chemical hazards evaluation work process that improves chemical reactions hazards prediction methods. Read more

Simplified Process Safety Management for Smaller Companies

Small companies that don’t exceed the threshold quantity requirements to be covered by OSHA’s Process Safety Management (PSM) of Highly Hazardous Chemicals Standard are still handling hazardous materials that may pose risks to their employees and the public. Read more

Sizing Relief Systems for High Viscosity Two-Phase Flow

High viscosity two-phase (HVTP) flow occurs in many industrial scale reactors, particularly when runaway reactions (e.g. during polymerizations) are vented through an emergency relief system. The design of a relief system for two-phase discharge can be complicated, as it involves a fluid with a liquid-like density and a gas-like compressibility. Read more

Systematic Evaluation of Chemical Reaction Hazards

Effective thermal hazard evaluation requires an integrated approach to assessment of chemical reactivity. A variety of theoretical and experimental methods can be used to determine the thermal stability of specific compounds or reactive systems. Notwithstanding this, recurrent problems occur with materials and/or reactions which are known to be inherently unstable. Correct application of physical tests and interpretation of output data is essential for effective thermal hazard evaluation. Read more

The Role of Chemical Reactivity Data in Process Safety Management

Chemical reactivity is addressed throughout the requirements of OSHA’s PSM Standard. It is specifically required in the process safety information element. In addition, it is necessary input to process hazard analyses, operating procedure development, emergency relief system design, and mechanical integrity. As the understanding of the impact of chemical reactivity hazards on the operation of a chemical process continues to develop, it is important to have a method for developing this data. Equally important is a method for extracting meaningful reactivity information from the data and incorporating it into process safety. This paper will present a process for evaluating chemical reactivity hazards using an Accelerating Rate Calorimeter (ARC®). It will then explain how to extract information from this data to help define process safety elements such as safe upper and lower limits, emergency relief system design, etc. Read more