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Relief Load Rate In The Two Phase Omega Method

Started by enginepassion, Jul 12 2014 06:38 PM
relief load rate in the two p

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#1 enginepassion

enginepassion

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Posted 12 July 2014 - 06:38 PM

I was doing PSV sizing for a vessel that receives gas (non-condensable) and liquid following Omega method, the orifice was huge. I was told that it's huge because I used full flowrates.  

Can I ask the experienced members to shed some light on what are the rules to be considered for selecting the floware?

 

Thank you,

EP


#2 Bobby Strain

Bobby Strain

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Posted 12 July 2014 - 07:22 PM

You must define flow at relieving conditions when the outflow from the vessel is blocked or otherwise restricted or the inflow is increased. And fire with the vessel blocked in.  Simple. You should review API recommended practices to help you. Most use the HEM model for multi-phase or flashing flow. And huge is not very definitive.

 

Bobby


Edited by Bobby Strain, 12 July 2014 - 07:24 PM.

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