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PSV on Plate & Frame Heat Exchanger

PSV on Plate & Frame Heat Exchanger

PSV on Plate & Frame Heat Exchanger

(OP)
I am trying to determine relief requirements on a plate & frame exchanger involving hot blowdown water and cold feed water.  

Blowdown water:  250F cooled to 86F    24.5 GPM
Feed water:      86F heated to 93.8F   450 GPM

The exchanger is rated for 150 #.  

The exchanger can be valve blocked in.

Questions:
Do I need a relief valve on both sides? (I'm guessing yes since both sides can be blocked in)
What special considerations do I need to think about since this is a plate and frame.  (I've dealt with a shell and tube before, so how does this compare as far as calculations go)

Any guidance would be much appreciated.  Thank you!

David

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