Page 230 - Rollingbearings

Centrifugal pump

C.3 Centrifugal pump

Performance and operating
This example shows the bearing selection process applied to an
application case in which modiication is required to a centrifugal
pump. conditions
The pump manufacturer wants to improve the eficiency of an
existing centrifugal process pump by modifying the impeller. As a
result, the bearing loads will be greater, and so the current bearing
selection needs to be checked to verify that it can cope with the
change. The application drawing is shown in ig. 1. The operating conditions are:
The steps in the example follow the sequence in the bearing selec-
tion process. Refer to sections B.1 – B.8 for a full description of each • rotational speed: n = 3 000 r/min
process step. • lubrication:
– method: oil bath
– oil viscosity grade: ISO VG 68
• for the non-locating support – a cylindrical roller bearing,
NU 311 ECP:
– max. radial load: F = 3,29 kN
r
– estimated operating temperature: T = 70 °C (160 °F)

Fig. 1
The centrifugal pump and its bearing arrangement

C.3 Centrifugal pump

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