Viscosity also has an effect on leakage losses and it has been found that the viscosity reduces the capacity of a pump at the best efficiency point. Figure 4 - 6, shows an example of how a centrifugal pump curve changes due to the effects of moderate to high viscosities. Gas can reduce viscosity. Viscous fluid can be produced with rec. Mixed RGS flow stages perform better than radial.
Temperature rise in pump High viscosity - reduces pump eff.
Heat manifested as fluid heating. AutographPC includes lab -derived viscosity correction factors for all Centrilift pumps. Gas migrates out of viscous fluids very slowly. Inverted shroud can be added to remove the gas and fluid discharged. Mixed flow stages provide higher capacity and better performance than radial stages.