3 replies to this topic

[namita.modak1]

We have a Vaccum Pump Downstream of which it is two phase and check valve is given on discharge line going to Separator.

On discharge line PSV is provided for a set pressure of 1.3 barg whereas the Separator design pressure is 14 barg.We have strainght guideline in API for single phase check valve failure case but not for Two Phase.Can you please guide how to estimate relief load.

[Pilesar]

I think you are saying that the line has two-phase flow under normal conditions. Will it still be two-phase under relief conditions? 

[latexman]

Can you please guide how to estimate relief load.

 

Usually, to be conservative on relief sizing, homogeneous two phase flow is assumed.

[breizh]

A few documents for sizing PSV -two phases flow.

What is scenario, check valve failure? What said the Hazop study to mitigate the risk? dual check valves? drawback head loss!

Good luck

Breizh

Attached Files

•  PRV sizing for 2 phase flow.pdf   3.47MB   10 downloads
•  PSV sizing an alternative solution to HDIM.pdf   1.9MB   9 downloads
•  relief valve sizing 2 phases.pdf   492.38KB   8 downloads
•  safety valve sizing 2 phases flow.pdf   1.37MB   8 downloads
•  proper relief valve sizing requires equation mastery.pdf   2.04MB   8 downloads