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[schecterman]

We have a small process water line that's not giving us adequate flow (not sure if it's the current flow meter or the control valve that's giving the issue yet). I'm investigating increasing the line size and subsequently the flow meter and control valves on the line. We have process water available at 80 psig through a 2 inch header, and it branches off through a 1'2" line with a vortex flow meter, then expands into a 3/4" line with a control valve with a Cv of 3.5 in it. The max flow we get is 130 psig with the vavle open 100%, but this is reduced dramatically when there are other process demands on the water header. 

 

Anyway, I was considering increasing the line size to 1" (instead of 1/2" through the meter expanding to 3/4" at the control valve which is currently set up), getting a 1" flow meter, and a 1" control valve with a Cv of 6. Does this sound reasonable? Also, do you guys recommend vortex or mag meters for a water line application like this? 

 

I've attached a hand drawn P&ID and the highlighted section depicts what I'm talking about. 

 

Thanks a ton in advance!

 

 

Attached Files

•  P&ID.jpg   138.39KB   3 downloads

Edited by schecterman, 14 April 2015 - 02:38 PM.

[Zauberberg]

The only way to find where is the bottleneck and which elements need to be upgraded or replaced, is to perform pressure drop calculation for all flowing cases of interest.