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Calculation Of Tank Pressure During Relieving Through A Pvv

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#1 J_Leo


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Posted 05 March 2018 - 10:11 AM




I am trying to back calculate the pressure in the tank during relieving to make sure the pressure doesn’t exceed the tank design pressure.


Tank design P: 16 in WC

PVV set pressure: 10 in WC

PVV type: piped-away


First, I used ProflowIII from ProtectoSeal to calculation the pressure (10.5 in WC) in the tank for the selected PVV (5”). Then, I set up a simple hydraulic model in HYSYS to also consider the pressure drop through the inlet and outlet piping (5 in WC). The pressure drop through the PVV is assumed same as the tank pressure from ProflowIII.

The calculated tank pressure during relieving = 10.5 + 5 = 15.5 in WC.


So, the hydraulic is ok. Is there anything wrong with the method I described?


Thank you very much!





#2 fallah


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Posted 05 March 2018 - 11:17 AM



What is the over pressure percent required (by vendor) for full open valve?  It can affect the system hydraulic you performed...

#3 J_Leo


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Posted 05 March 2018 - 08:27 PM

Hi Fallah,
I am not sure about it. It seems that as long as it doesn’ t exeed the tank pressure the valve size is ok. When the valve is too large, the software shows it flutter.

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