Fire Case Vessel Depressurization | API 521 & Aspen HYSYS

Emergency depressurization is one of the most critical safety measures in process plants, particularly during fire exposure. If a pressurized vessel is subjected to fire, the metal strength decreases while internal pressure rises—creating a serious risk of vessel rupture or BLEVE. In this video, you will learn: ✔ What vessel depressurization is and why it is required ✔ Fire case depressurization philosophy as per API 521 ✔ Adiabatic depressurization and temperature drop effects ✔ Key design constraints and safety considerations ✔ How to model fire case depressurization in Aspen HYSYS This tutorial is ideal for process engineers, safety engineers, and chemical engineering students working in oil & gas, chemical, and energy industries.