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[ChemEng01]

Any ideas of how to convert a valve CV to an equivalent orifice size?

 

I want to calculate 2-phase / dense phase flow through a failed open control valve using the HEM method.

 

In the past I have used online calculators to do this conversion, and also equations from crane to get k factor and calculate equivalent orifice size.

 

Any one got any other methods?

 

Reason being, is that if the HEM method is used for RV sizing, it should also be used for calculating the breakthrough rate through the control valve.

 

Any ideas

 

Thanks

[PaoloPemi]

if you know valve data ask the manufacturer about (free) port area in case of failure,

from this and a model as HEM, HNE or NHNE (I use the models available in Prode library)

you can estimate the flows in different conditions,

if you know only CV guess the port size from a similar valve (caution, this may originate large errors).  

Edited by PaoloPemi, 30 May 2014 - 04:41 AM.