Equipment in a toll manufacturing facility must be designed to handle many different chemicals and processes. This article offers advice for sizing pressure-relief devices for such applications.
Toll manufacturers often use a single piece of equipment for multiple processes. Over its lifetime, the same piece of equipment may contain a dozen different chemicals. Therefore, the pressure-relief device (PRD) on that equipment must be sized to handle the absolute worst-case relief scenario for all chemicals it could contain.
When sizing PRDs, the design engineer must consider all relief scenarios and choose a PRD that has a rated (i.e., installed) area or flow capacity larger than the greatest required area or flow capacity calculated for each application. This process can be very time consuming if numerous chemicals must be considered. This article describes how to quickly determine the worst-case relief scenario, so the design engineer can evaluate which chemicals will require more-detailed orifice area calculations.
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