Lobe pump curve< flowrate & press.

Hi,

For the life of me I can't find a pump curve for this specific Johnson Pump UK online. I've asked around for a week but nothing.

We have 4 lobe pumps that I am investigating & want to understand their curve / flowrate & pressure. We want to use the pump to circulate yeast used for cropping at a brewery.

I'll attach the nameplates, motor plates & gearbox plate for 2 of the 4. Seems all the pumps are identical. I assume the flowrate is the volume in volume casing x rpm (using the I ratio from the gearbox & motor rpm)?

Thanks, Josh