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Thanks to all those who responded! Plenty of info for me to proceed!

Ashereng suggested that I might get more detailed responses with process conditions so here goes... Flowrate = 150 m3/hr Suction P = tank head Discharge P = 700 kPa Temp. = 15 C SG = 0.93 Viscosity = 350 cSt Thanks to everyone for their answers.

To clarify, the pump I am installing is a 3-screw pump from Imo Industries.

I was wondering if anyone has any experience with using screw pump (speed to meter flow rate. In theory it should work (i.e. volume per rotation x RPM = volumetric flow), but there has to be something that I am missing otherwise EVERYONE would be doing it. Can this be done? If so, what kind...