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Artisi: Entrained air a very real possibility, I will endeavour to mash together some trials where we keep well away from tank low levels currently experienced. Thankyou & all others for chipping in, must say this has be a humbling experience. Kind regards

Artisi: I understand your point of view, I had not accounted for atmospheric pressure, thanks for educating me I shall endeavour to re-consider some aspects as soon as possible Cheers

Artisi: Pump centre situated slightly lower (0.45m) than tank outlet, pressure drop through valves/bends/piping calculated to be 0.35m I don't understand where you get 8-9 metres of line losses from, if I have steered you wrong I am sorry, certainly not intent Please consider that not everybody...

QualityTime: I have yet to put my complete case to them, the years have gone by with very little analytical assessment of the situation I am trying to paint a picture to them so they can help us to get past this, sometimes people don't like reversing their prospective It is a very strange...

LittleInch: Head pressure is consumed through the process line, the pump in question is controlled by a pressure at the end of line to 2.0 bar Process feed pressure from pump is 8.0 bar at start, 10.0 bar at end of run, fouling/friction consumes the pressure Start of run output 65% @ 30.0 amps...

Pump curve attached:http://files.engineering.com/getfile.aspx?folder=f358da0e-0467-41eb-b5f7-d083edff0aed&file=Pump_curve_for_Eng_tips.JPG

Littleinch: Pump outlet pressure operating at start of run (8.0 bar) progressing to (10.0 bar) at end of run due to fouling The minimum operating pressure (2.0 bar) I mentioned is at the very end of a lengthy processing line No flow does not fluctuate as mentioned several times, flow is fixed at...

Artisi: Sorry thought I included, flooded inlet. I will post pump curve tomorrow

More feedback: QualityTime: Product viscosity measured at 65 cP, other products processed without issues 50 cP Pump situated slightly lower (450mm) than tank outlet, pressure drop through valves/piping approximately 0.35m Pump flow very stable, pressure not stable at pump outlet "oscillation"...

Hoping somebody can steer me in a direction Centrifugal pump controlled by VSD, control loop increases/decreases speed dependent on end of process line pressure (min 2.0 bar) Higher than sustainable amperage only occurs when operating specific products (higher viscosity) although not every time...