![]() Let imagine, when relief valve open, relieving fluid flow thru Tail Pipe –Sub Header – Main Header-Flare Drum-Seal Water Drum – Flare Stack – Flare Tip and finally discharged to atmosphere at certain height ( for safe disposal purpose) In this explanation I use a general flare system which the disposal is discharged to atmosphere via flare stack. Read my previous post about back pressure for more detail in built up and superimposed back pressure Oh, do you still remember what is built up back pressure? Is it a constant or variable?īuilt up back pressure is pressure at outlet PSV in open mode, a variable back pressure since it is depend on the relieving flow. In this article I will explain you how to calculate the built up back pressure. My friend, do you still remember? One of consideration in selection of relief valve type is built up back pressure. ![]()
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