Steam Drum PSV Inlet losses

[Iomcube]

@

https://www.eng-tips.com/viewthread.cfm?qid=286603

In my openion, since the PSV will be located immediately downstream of reducer, we must consider Total pressure loss since pressure recovery is not possible downstream of reducer.

Facing similar problem:
While calculating pressure losses (unrecoverable) at PSV inlet (must be less than 3%) ...We have a straight line from steam drum nozzle & PSV is attached via reducer. So X3 components friction losses are to be considered. Question is I will include entrance losses at nozzle but will I include exit losses from reducer?

I believe exit losses after reducer will not be included ...because that entails assuming steam is exiting to atmosphere that will be a huge loss abrogating 3% rule

Attaching Katmar AIOFlo image to further my point

 

[Latexman]

Exit losses from reducer - no.

Good Luck,
Latexman

 

[pierreick]

Hi,
Consider the document attached to support your work.
Good luck
Pierre

 

[Iomcube]

Thanks everyone for answering. In case anyone interested I have posted solutions here done using SMATH Studio

https://www.eng-tips.com/viewthread.cfm?qid=490454