The advantages of using three-disc bearings on chemical process pumps

In certain circumstances, ATACH may indicate in the quotation or contract that the bearings of the chemical pumps are designed 

as three-disc bearings. So, why does ATACH Industrial Pump Factory adopt such a design? Now let's explain the reasons and causes. 

The main advantages of using three-disc bearings (i.e., three bearing support structures) in chemical process pumps lie in enhancing the stability, 

reliability and lifespan of the equipment. They are particularly suitable for high-speed, heavy-load or harsh medium conditions. 

Based on the practical engineering feedback from ATACH's customers, the core advantages are as follows: 

1. Enhance the rigidity and alignment accuracy of the shaft system

The three-disc bearings effectively limit the radial and axial displacements of the pump shaft through three-point support, 

reducing shaft deviation caused by uneven medium, thermal expansion or mechanical vibration, 

thereby ensuring the normal operation of sealing components (such as mechanical seals) and rotor components.

2. Improve the bearing capacity and lifespan

The distribution of multiple bearings can share the axial and radial loads, 

reducing the stress concentration of a single bearing, extending the overall bearing lifespan, 

and being particularly suitable for chemical process pumps that transport particles, high-viscosity or corrosive media.

3. Improve operational stability and reduce vibration

The three-disc structure can better suppress shaft deflection and resonance, 

reducing vibration and noise during pump operation, enhancing system stability, 

which is crucial for precision or high-pressure chemical process applications.

4. Adapt to harsh conditions

In high-temperature, low-temperature or highly corrosive environments, 

three-disc bearings are often combined with corrosion-resistant materials (such as stainless steel, 

silicon carbide) and self-lubrication designs to enhance the reliability of the pump in extreme conditions.

5. Facilitate maintenance and modular design

Some chemical process pumps(such as the CZ type) adopt a rear-pull structure, 

and the three-disc bearings can be integrated into a detachable bearing housing, 

supporting quick replacement without moving the pump body or pipeline, reducing maintenance downtime.

Note: Although "three-disc bearings" is not a standard term, in engineering context, 

it usually refers to the three-point support bearing arrangement (such as double support + thrust bearing, or a combination of three radial bearings), 

and its design principles are consistent with the above advantages. 

For further details on the bearing configuration of specific pump types, 

please refer to the technical data of the ATACH brand CZ type chemical and petroleum process pump.