According to the pump's curve, the dP @ 3.5 gpm should be 11.2', or 134 inches (4.8 psi). Some of it will be within the loop, some from the flowmeter, and more from the airtrap.
Guesstimating, I'd put 0.2 psi at the flowmeter, 0.12 for the airtrap (calculated), leaving 4.48 psi for the core, but including tubing and fitting restrictions.
I believe that the results are close to what they should be.
|