Flow meter 1

[Leo165]

What can be affects of turbulance or recirculations near pressure tappings on orifice flow meter performance

ahmad

 

[ghensky]

Are you trying to take the pressure readings near the orifice or are you placing the orifice near the existing pressure tappings?

 

[bimr]

The flow experiments run to determine the value of the orifice discharge coefficient require a fully-developed, turbulent,
axi-symmetric, swirl-free velocity profile upstream of the orifice meter. Therefore, if the velocity profile at the inlet to an orifice flow meter are not fully-developed, turbulent, axi-symmetric, and of swirl-free velocity, a measurement bias is likely to result - and the magnitude of the bias error can be up to several percent of meter reading for flow rate. The extent of the error will depend on the magnitude of the disturbance.

http://www.crt-services.com/pdf/pap...n Measureing And Regulating Stations 6120.pdf

 

[Leo165]

ghensky !

I am doing CFD validations of flow meters, for a certain flow meter, I am getting water velocity of 0.2 m/s exactly near/at the tappings (flange type) , which is not a common result. How this can affects the performance of flow meter ?

ahmad

 

[gcastan]

Ahmad,
The flow requirements and pipe diameters before and after the flowmeter depend on the type of flowmeter. That is, disturbances affect differently to each type of flowmeter. You better check the specifics from the vendor.

Gabriel Castaneda, P.E.

http://www.gabcheminc.com