In the August 2009 Tip of the Month (TOTM), it was shown that pumping power requirement varies as the crude oil °API changes. Increasing °API or line average temperature reduces the crude oil viscosity. The viscosity reduction caused higher Reynolds number, lower friction factor and in effect lowered pumping power requirements. Since the objective of the August 2009 TOTM was to study the effect °API and the line average temperature have on the pumping power requirement, the effect of crude oil viscosity on pump performance was ignored and in the course of calculation a constant pump efficiency of ? =0.75 was used for all cases. In this TOTM, we will consider the crude oil viscosity effect on a selected centrifugal pump performance. The Hydraulic Institute Standards procedures and the guideline presented in the August 2006 TOTM written by Honeywell were applied to correct the pump efficiency.

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