Ball bearings are most commonly use

Ball bearings are most commonly used in small and medium sized pumps because of their high speed capability and low friction.The bearings of the horizontal processpump are most frequently oil bath lubricated. In some cases (as shown in figure2.2b) the bearings supporting the axialload are mounted in a bearing housing,separate from the pump frame, to allowadjustment of the impeller in the casing.In these cases, the adjustable housing isshimmed with the frame to ensure goodbearing alignment.