Joined: June 11, 2007
Posts: 28
Location: Karnataka
Status: Offline
Posted:
Dec 05, 2007 - 03:09 AM
Post subject: Doubt regarding Vortex Flow meter
Hello,
I have a doubt regarding my Vortex flow meter. This flow meter iam using for steam. Operating pressure is 0-7.5kg/cm2. Flow range is 320-5262 kg/hr. Now my doubt is, is the flow reading i am getting from the fow meter is effected by the pressure disturbences in the line? Because the pressure i am getting from boiler is not always constant.
Thanks in advance
--Sirisha
fundu_instru
ICE Expert
Joined: June 20, 2006
Posts: 180
Location: Singapore
Status: Offline
Posted:
Dec 08, 2007 - 06:03 AM
Vortex flow meter are not much sensitive to pressure changes.
As it depends on the vortices only, if pressure goes beyond limit then only response need to be re checked.
sirisha
ICE Student
Joined: June 11, 2007
Posts: 28
Location: Karnataka
Status: Offline
Posted:
Dec 08, 2007 - 10:27 AM
Thanks for the reply..
Regards,
Sirisha.
Carl_E
ICE Student
Joined: May 30, 2010
Posts: 11
Location: Illinois, USA
Status: Offline
Posted:
May 30, 2010 - 08:44 PM
I realize that this post is over 2 years old, I can't let it pass without comment.
Steam is a gas, and as a gas it is compressable and is subject to the ideal gas law.
Vortex flow measurement is a velocity measurement. Conversion to volume or mass is done by calculation based on density at design conditions.
Vortex flow measurement of steam will show an error if steam flow varies from the design pressure and temperature conditions.
The chart below was originally done to show the error possible for uncompensated pressure for DP gas/steam measurement, but applies to Vortex as well.
Models with temperature and (absolute) pressure compensation are available for gas and steam flow measurement. The additional tubing 'handle' in the photo below is the pressure impulse line to the absolute pressure sensor.
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