Coriolis type flow meter vs Vortex flow meter

[hswang2]

Dear
I would like to know which Coriolis or Vortex flow meter is better for the steam fluid and why is the reason for
that.

As I know vortex shedding flow meter is wildely used type of oscillaotry flow meter. The frequency of the vortex is directly proportional to the velocity of the fluid flowing through the flow meter. And, it is becoming increasing more popular for measuring the flow of steam, liquid and gases.

Thank you very much for your kindly help.

 

[jmw]

Not becoming, the Neptune Vortex meter was the meter to use for steam replacing the rotary shunt meters in many applications (Kent).
This used a shuttling disc to detect shedding.
Now you have had for a long time Yokagawa at the top of the tree and more recently Emerson.


JMW

http://www.ViscoAnalyser.com

 

[quark]

Density compensated vortexes are relatively new for Emereson. Erstwhile Rosemount had nothing to offer me, back in 2002, when I had a requirement for steam and gas flow measurement. They were promoting orifice meters (and Annubars) that time where as all other manufacturers were well established.

Endress+Hauser is another good manufacturer. I would also check for the noise reduction (due to vibration) techniques while going for a vortex.

I am a bit confused by the last sentence in your second paragraph. That is rather marketing than technical.

 

[quark]

PS: My last sentence refers to OP

 

[JLSeagull]

One selection factor is the line size. Coriolis meters are more cost effective when applied to smaller lines than larger lines. NPS 6 is very large for a coriolis meter. This is not a sigificant size for a vortex shedding flow meter.

Another factor is the low flow cutoff with a vortex meter. The accuracy for a coriolis meter is normally stated in percentage of flow rate compared with percentage of the full span with many other technologies. With a orifice/dp flow meter the accuracy drops off toward with low flow. A vortex meter stops working with low flow.

 

[davefitz]

I was under the impression that coriolis meters were designed to measure two-phase flow fluids or slurries or fluids that were non-isentropic in some manner. It seems like overkill with an easy fluid as steam.

 

[JLSeagull]

In earlier times, doppler flow meters worked if a liquid had bubbles or particulates; and coriolis worked with a full pipe of liquid that excluded bubbles or particulates. Presently several manufacturers claim that their coriolis meters work with some bubbles.

Steam is easier to measure than many fluids.

 

[dcasto]

Another factor is that coriolis meters have a high pressure drop.

With steam, keep it simple.