Why Viscous Fluids Shouldn’t Go Near Centrifugal Pumps



Viscosity in pumped fluids can cause issues with all kinds of pumps, not least a centrifugal pump. Plant Services calls it the “great bugaboo of the industry”. One thing all centrifugal pump suppliers in Canada can all agree on is this type of pump isn’t a great choice for viscosities above 100 centipoise (cP), let alone 300. This calls for a positive displacement pump, usually one that is self-priming. To put this into perspective, the viscosity of honey at 25 degrees is 2,000 cP.

According to Pumps and Systems, viscosity measures the resistance of the fluid to flow at a given temperature. Think of it as fluid friction – or the fluid’s resistance to being pumped.

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