Why You Should Use Plume Models for Chemical Emergency Response
During unplanned chemical releases, there are bound to be more questions than answers. Plume models are the best way to answer these questions and more.
A plant-wide power outage at Pasadena Refining Systems in Texas one hot July day forced the plant to flare off some product, including sulfur dioxide. As the toxic black smoke drifted into the nearby community, safety officials partially shut down the Houston Ship Channel and issued a precautionary shelter-in-place alert to protect area residents.
Fortunately, no injuries were reported as a result of this sulfur dioxide release, but the incident serves as a reminder that preparedness includes knowing events beyond your control can and will happen. No amount of operational excellence, operator training or reliability and maintenance could have stopped this event—that’s why it’s so critical to be prepared for any emergency.
During unplanned chemical releases, there are bound to be more questions than answers. You’ll ask yourself things like, what’s happening on the ground? What gas is being released? How much was released and where is it going? Will my employees, responders and neighbors be exposed to dangerous levels of gas, and when will that happen? Where should I focus my emergency team to ensure an efficient response? Is it safe to shelter-in-place or should I order an evacuation? When can I say it’s safe?
Plume models are the best way to answer these questions and more.
What is Plume Modeling?
Plume models, also known as atmospheric plume dispersion models, are software-based algorithms that calculate the path and concentrations of airborne contaminants after a release.
Some plume modeling software incorporates real-time data from gas and weather sensors into advanced algorithms to tell you what contaminant is being released, where it’s coming from and where the plume or cloud is going. With this information, you can accurately identify the hazard zone and areas that will be affected within a two-hour window, allowing you to make quick safety decisions for plant personnel. You can immediately notify first responders and arm them with the information they need to set up roadblocks, evacuation centers and command posts, as well as decontamination, triage and staging areas.
This article originally appeared in the December 1, 2020 issue of Occupational Health & Safety.
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