SKF
Centrifugal Pump Bearing Selection
Centrifugal pumps are a cornerstone of industrial fluid handling, requiring bearings that withstand combined radial impeller forces and axial thrust. SKF’s centrifugal pump bearing selection example guides engineers through the arrangement of angular contact ball bearings paired with deep groove or cylindrical roller bearings to handle hydraulic thrust. The process involves calculating the axial load from impeller pressure differentials, selecting the appropriate contact angle (40° for high thrust, 25° for moderate), and verifying the L10mh life under continuous operation. Lubrication is typically oil bath or grease, with attention to oil cleanliness or grease compatibility with pumped fluids. SKF Explorer angular contact bearings, with optimized raceway geometry and high-quality steel, deliver extended service life even under moderate contamination. A well-documented selection ensures reliable pump operation and reduced energy consumption.
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Thrust Handling Configurations
Angular contact ball bearings in back-to-back or face-to-face arrangements absorb axial loads.
High-Speed Capability
Suitable for 2-pole and 4-pole motor speeds with low-friction designs.
SKF Explorer Performance
Upgraded bearings provide superior fatigue life and wear resistance.
Sealed and Lubricated Options
Factory-greased, sealed bearings for small to medium pumps reduce maintenance.
Accurate Load Calculations
SKF methods differentiate between radial and axial impeller loads.
Thermal Shaft Expansion Accommodation
Arrangements with cylindrical roller bearing as non-locating end.
Bearing Arrangement for End-Suction Centrifugal Pumps
A typical arrangement uses a pair of single-row angular contact ball bearings (arranged back-to-back) at the drive end to carry radial load and bidirectional thrust, plus a single-row deep groove or cylindrical roller bearing at the impeller end as the non-locating bearing. This configuration resists impeller thrust while accommodating temperature-induced shaft length changes.
Improving Pump Reliability with Correct Bearing Lubrication
Oil contamination from process fluid leakage is a leading cause of pump bearing failure. SKF recommends well-designed oil seals or mechanical seals to protect the bearing housing. In grease-lubricated pumps, low-noise grease with excellent water resistance, such as SKF LGHP 2, maintains the lubrication film and prevents rust.