OVIM 60Hz OVIMF 60Hz - Tru20

OVIM/OVIMF 60HzGeneral DataCurve IllustrationFirst number: StageSecond Number:Number of small impellerOVIM32/OVIMF32Pump Q-H curve, thethickened line presentsrecommended performanceregion.The power curve presentsthe input power of eachstage, which is dividedinto integrate impellertype (1/1) and the typewith small impeller (2/3)Eta curve presentspump efficiency. Forpumps equippedwithsmall impeller, theefficiency will be 2% lowerthan that shown by thecurve.The Q-H curve of each stage, presenting integrateimpeller type (1/1) and the type equipped withsmall impeller (2/3).NPSH curve expressesthe average value of allcurves of this series.A safety margin of 20 in.shall be taken into considerationwhen makingselection.Performance CurveThe following conditions are suitable for the performancecurves shown below:1) All curves are based on the measured values of constantmotot speed 3500 rpm.2) Curve tolerance in conformity with ISO9906 Annex A.3) Measurment is done with 68ºF air-free water, kinematicviscosity of 1mm 2 /sec.4) The operation of pump shall refer to the performanceregion indicated by the thickened curve to prevent overheatingdue to too small flow rate or overload of motordue to too large flow rate.5