BB4 multi-stage pump bearings
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Segmental multi-stage pumps, BB4 pumps – I’ve seen that some of them use rolling bearings at both ends while others use sliding bearings. What are the differences between using these two types of bearings? What are the requirements regarding the operating conditions? Please share your insights, experienced users
Rolling bearings have low costs, do not require high precision in manufacturing, are easy to install and remove, but have a short service life； Sliding bearings are costly, require high precision, are difficult to control, but have a long service life ； Most companies use rolling bearings these days
It depends on the power of the pump. Sliding bearings have low operating noise; as long as proper lubrication is maintained, they can operate for 3 to 5 years or even longer. It's quite good if the service life of a rolling bearing can reach 2 years.
Does a large pump’s sliding bearing require an oil station?
What are the differences and requirements between the two types of bearings in terms of speed, associated power capacity, lifespan, and auxiliary facilities?
As the original poster said, the BB4 pumps here come with sliding bearings equipped with separate lubrication systems, but they aren’t used very often. The key and critical pumps, as well as the hydrogen feed pumps made in Japan, use this type of system. Most of them use rolling bearings.
As long as the axial forces in multi-stage pumps are properly balanced, rolling bearings remain quite durable.
Rolling bearings are more commonly used; they are durable under sliding conditions, but require an auxiliary oil supply system