ROTAN Gear Pump Brochure_English

Selection of pump sizeVISCOSITY (cSt)20115215112610181665150,000 25,000 3,000 400 & below75,000 40,000 7,500 1,00041332640 60 80 100 150 200 300 400 600 800 1,000 1,5001750SPEED (rpm)1501009080706050403020109876543210.90.80.70.60.50.40.30.20.1CAPACITY (m 3 /h)To select the pump size with this table, youonly need to know:– Capacity– ViscosityStart at the top of the table with theviscosity, and draw a line down, stayingwithin the colour of the selected viscosityrange (see example).Start at the right of the table, draw a horizontalline starting with the required capacity (seeexample).The point where these two lines meetdetermines the pump size, defined by the diagonallines in the table. If you do not hit oneof these pump lines exactly, increase ordecrease the capacity a bit. The speed isfound vertically below the point of intersection(see example).The maximum speed of each pump is foundvertically below the end of each pump line(indicated with the small black dot). Thismaximum speed must be reduced to max.50% when pumping strongly abrasive liquidsor emulsions. When the differential pressureis known, the shaft power is calculated asfollows:E(kW) = 0.07 x flow (m 3 /h) x differentialpressure (bar)The requested shaft power has to beincreased by up to 35% when using a smallROTAN pump in combination with highviscosity. (More than 10,000 cSt).The requested shaft power has to bedecreased by up to 35% when using a bigROTAN pump in combination with low viscosity.(Less than 500 cSt).