Axial Thrust

Cause and Effect Axial thrust is the thrust imposed in the direction of the shaft. It may occur in either the inboard or the outboard direction and is usually composed of a dynamic cyclic component superimposed on a steady-state load in either direction. The dynamic cyclic component increases in the recirculation zone and may impose excessive stresses in the shaft, which could ultimately result in failure from metal fatigue. The static component may impose an excessive load in the thrust bearing, causing unacceptable bearing temperatures. The majority of thrust-bearing failures are caused by fatigue failure of the bearing components from dynamic cyclic axial loads.

Diagnosis from Pump Operation High axial loads usually produce high thrust-bearing temperatures and short thrust-bearing life.

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