May 2019

Heat Transfer

Calculate shell-and-tube exchanger heat input for PSV fire case

According to API Recommended Practice (RP) 521, 4.4.13.1, “Fire exposure on equipment can result in overpressure due to vapor generation and/or fluid expansion.

Su, S., ProPEng Inc.

According to API Recommended Practice (RP) 521, 4.4.13.1, “Fire exposure on equipment can result in overpressure due to vapor generation and/or fluid expansion.” The scenario of a shell-and-tube heat exchanger, with liquids on both sides that are exposed to open fire, is studied here. The shell-side pressure safety valve (PSV) sizing for fire exposure can be easily done by calculating the heat absorption from the shell wetted surface area (see API RP 521, 4.4.13.2.4.2 for details). However, there is no detailed guideline on how to size the tube-side PSV for a fire case, since the tubes are inside the shell and are not directly exposed to fire. Frequently, the wetted surface area of the head

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