Pressure Relief Disposal Systems

In the previous several sections, we have covered the identification and quantification of pressure relief requirements and the selection, sizing, and installation of pressure relief devices to provide relief flow. This section discusses the issues involved in handling the fluids discharged from these relief devices and from emergency
depressuring (“blowdown”) valves. The selection and design of piping and equipment to handle these fluids needs to satisfy a variety of criteria involving both the impact of the fluids on personnel and the environment, and the impact of the disposal system on the performance of the relief devices that feed into it. The relief device discharge fluids should be disposed of safely, economically, with a minimum environmental impact, and without limiting the relief of overpressure within the process equipment.

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