Orifice - Flow Element Calculation

[decentmenace]

I am trying to calculate the orifice diameter for a flow element... On using a couple of different softwares (Flow Cacl 32 and Instrucalc)... I'm getting two different results however I get the same error that my Reynolds number is too low...

Sizing for a liquid w/ SG=1.081, Operating Temp 93.30C, Operating pressure 10203 kPag, Max. Flow = 2m3/hr and Normal Flow = 1.6m3/hr. Viscosity is 11.20 cP and the Dry Diff. Range = 0-250mbar. All of this is flowing through a 2" Sch 160 Pipe.

Any thoughts folks???

 

[Latexman]

You have laminar flow. It's preferred to size orifice meters in the "fully turbulent" zone so the flow coefficient remains fairly constant.

Good luck,
Latexman

 

[decentmenace]

But I am not trying to size an orifice meter.. this is just for an orifice plate...

Also, the software does not give you any options for the flow zone.

 

[Latexman]

Why did you give a range as if for a differential pressure transmitter?

A 25 kPa pressure drop out of 10203 kPag seems way too small for a restriction orifice. It seems kind of small for an orifice meter too, but it's closer.

You have laminar flow. It's preferred to size orifices in the "fully turbulent" zone so the flow coefficient remains fairly constant.

What is your objective anyway - limit flow, lower pressure?

Good luck,
Latexman