Also known as a line bearing.
In most end suction centrifugal pumps it is the bearing located closest to the stuffing box. This bearing handles most of the radial loads put on the impeller. (#16)
Radial bearings being retained by a simple snap ring is a design problem found in many low cost pumps. Beyond 65% of its rated efficiency most centrifugal pumps thrust towards the pump volute. The thin snap ring has to absorb all of this axial thrust and most of them cannot do it very well. Intermittent service pumps experience trouble with the snap ring wearing the snap ring groove, allowing excessive axial movement of the bearing and impeller.
The other bearing in the power end of the pump, located close to the coupling, is called the thrust bearing (#18).
- On February 16, 2018