Pump X has no efficiency curve data. Nominal efficiency was used in viscosity correction calculations

A Caution message in AFT Fathom

This message displays for centrifugal pumps which use viscosity corrections to the performance curves. Typical corrections depend on efficiency data which typically depends on flowrate. No such data was provided by the user. However, the user did provide nominal efficiency and that was used in the viscosity correction calculations. Viscosity correction results are less certain in this case.