Venturi tube - Multiphase medium

[zdarlight]

I have a strange enquiry for a set of Venturi tubes. The process conditions layed out describe a fluid (hydrocarbon/wet gas) whoms vapourisation pressure at process conditions is exactly the same as the process pressure. They also want the tubes designed to ISO 5167, which is impossible given the flow is not single phase throughout.

Does anyone have any thoughts on this?

The customer has clearly layed out vapour and liquid properties and insisted on a dualphase flow, but I've never seen a venturi enquiry like this before and like I said my initail thought was the product cannot/should not be made.

 

[BigInch]

It wouldn't seem like a good idea, as the further reduction of pressure upon entry into the venturi would kick up the vapor output of the stream, but if their intention is to meter a maximized vapor flow, you might also ask why not, provided that the accuracy of the measurement is of small importance.

Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso

 

[ione]

Venturi tubes can be used for wet gas metering, upon condition the equation reported in the ISO 5167 standard is corrected to keep into account the gas fraction.
You could look for “Liquid Correction of Venturi Meter Readings in Wet Gas Flow” – de Leeuw

 

[BigInch]

I think they shouldn't be used for wet gas metering near the vapor pressure. Is ISO 5167 allowing that? If it was wet gas above the vapor pressure where the fraction of liquid remains constant, it would be OK to do that.

Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso