(finally) got a reply from Blue-White, as I asked them about the pressure drop, and the required length of tubing before and after the meter.
Quote:
Pressure Drop For Model F-44500LH-8:
.5 GPM = .12 lbs
5.0 GPM = .25 lbs.
Please access our tech support website www.blue-white.com to view detailed specifications for your model.
On variable area flowmeters certain before and after straight lengths of pipe run is not required to ensure accuracy.
The meter must be protected from "water hammer" and or fast opening valves. Pleas view the installation instructions
on the tech support site for more details.
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so I asked them for for an actual graph. We'll see.
I also e-mailed the Sales dept, 'cause I figured that the tech dept was too busy:
Quote:
Thank you for your inquiry. Please visit our product support web site at www.blue-white.com for additional specification details on the Blue-White F-440 series flow meter. The pressure drop at the low scale reading of 0.5 GPM is .12 PSI, and at the high scale reading of 5.0 GPM, the pressure drop is .25 PSI. These pressure drop ratings are approximate values obtained using bourdon tube type pressure gauge, 0-30 PSI.
For additional assistance in the Houston area, please contact our distributor:
Ryan Herco Products
Phone (713) 670-0300
Fax (713) 670-0308
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A bit more helpful, but not much.
The good news is that the pressure drop at 5 gpm is only 0.25 psi, which is equal to 7 inches of water (@39.2oF, 4oC).
As I suspected, it's not a bad flowmeter.
Now if I could apply Since87's equation, I could draft up my own curve...