Petrochemical Plant

Minimising production stoppages and maximising productivity are crucial in the petrochemical industry. The machine components used in this sector – such as pumps, compressors, electric motors, blowers and ventilators – are particularly susceptible to change. These components contain bearings which have to work reliably and precisely, even in challenging conditions.

As one of the world’s leading manufacturers of bearings, NSK is a valuable partner for the petrochemical industry. Our Application Engineers are the first people you should talk to – they have the expertise to work with you on developing solutions that effectively cut costs and boost productivity.

Our specialists are in touch with the research and development teams at OEMs that produce components for petrochemical systems. This enables them to develop new bearing solutions at every level of your project. 

Tap into this experience and knowledge for your company’s success! 

  • Centrifugal Pumps
  • Special Pumps
  • Compressors
  • Other
  • Products

Centrifugal Pumps

Centrifugal Pumps

Operating conditions: medium speeds, axial and radial loads

If a process pump fails in a petrochemical plant, this can lead to costly downtime. Centrifugal pumps are used to transport liquids at every stage of the process and are among the most sensitive components used in the petrochemical industry.

Pump applications place a great deal of strain on bearings, meaning that the materials used for bearings and bearing cages have to withstand tough conditions. The bearings have to support axial, radial or combined loads, run equally reliably at low and high speeds (1,500 rpm to 3,000 rpm) and handle different lubrication conditions with ease.

Total Quality Solution:
NSKHPS Angular Contact Ball Bearings

The single-row angular contact ball bearings from the NSKHPS  series run extremely reliably in compliance with API standards, especially in difficult applications as centrifugal pumps. They boast a long life, even when exposed to high axial loads.

The special high-strength cage construction makes the bearings in the pumps more resistant to shock loads and vibrations. Thanks to the precisely manufactured guiding surfaces, the noise level is lower than that of conventional bearings.

Our Innovations:
High Capacity Deep Groove Ball Bearings - HR Series
EW Series of Cylindrical Roller Bearings
EM Series of Cylindrical Roller Bearings
BMPC Pump Bearings 
Double Row Angular Contact Ball Bearings 

Centrifugal Pumps

Special Pumps

Submersible Pumps

Operating conditions: vertical shaft position, axial loads (bottom bearing), very light radial loads (top bearing)

Submersible pumps are widely used for water and wastewater applications. They have a vertical driving motor which is connected to the impeller at its extremity. The double-row angular contact ball bearing at the bottom must withstand axial and radial loads, while the deep groove ball bearing at the top is only subject to light radial loads. It is important to avoid creep (relative motion) between the outside diameter and housing of the top bearing.

Total Quality Solution:
Creep-free bearings for rotating loads 

The tight O-rings fixed to the outer ring help to prevent the creep phenomenon when the bearing is subjected to rotating loads. Fitting the bearing is very easy and the housing is reusable. 

Our Innovations:
High Capacity Deep Groove Ball Bearings - HR Series 
EW Series of Cylindrical Roller Bearings
EM Series of Cylindrical Roller Bearings
NSKHPS Angular Contact Ball Bearings HPS
Double Row Angular Contact Ball Bearings


LNG Pumps

Operating conditions: speed: 1,160 rpm to 3,600 rpm, gas temperature: −196°C to 0°C, predominantly axial loads, insufficient lubrication

Liquefied natural gas (LNG) pumps are used to load/unload cryogenic liquids in tanks. The bearings used here must be able to withstand a liquid gas temperature of −162°C and are partly lubricated by the pumping medium.

Total Quality Solution:
Stainless steel bearings with fluororesin cage

LNG pump bearings from NSK are made from stainless steel, which provides excellent corrosion resistance. They also feature a specific cage made from fluororesin. This material is extremely useful as it is self-lubricating even at very low temperatures. 

Our Innovations:
High Capacity Deep Groove Ball Bearings - HR Series 
NSKHPS Angular Contact Ball Bearings  
Double Row Angular Contact Ball Bearings 

LNG - Liquefied Natural Gas


Roots Blowers

Operating conditions: dry running, medium to high temperatures, vibration

Roots blowers are rotary piston blowers which are often used to transport gas. The gas is carried from the intake side to the exhaust between the lobes of the rotors and the outer wall and compressed by the backflow. This can generate some vibrations, which bearings must be capable of withstanding.

Total Quality Solution:
Cylindrical roller bearings and double row angular contact ball bearings with steel cages

NSK’s high-performance cylindrical roller bearings and double-row angular-contact ball bearings come with a steel cage which is resistant to heat and wear. 

Our Innovations:
Cylindrical Roller Bearings with L-PPS Cage
Angular Contact Ball Bearings with L-PPS Cage


Oil-Injected and Oil-Free Compressors

Operating conditions: oil lubrication, medium to high speeds, medium to high axial and radial loads

Two screws are used to compress gases. The gas enters on the inlet side and flows through the threads while the screws rotate. As the compression space becomes smaller, the gas is compressed. This process requires bearings that can withstand high radial and axial loads and enable precise shaft positioning.

Total Quality Solution: 
Angular contact ball bearings & cylindrical roller bearings with special cages

NSK has developed special angular contact ball bearings and cylindrical roller bearings for oil-injected screw compressors. The bearings come with an L-PPS cage. NSK’s patented material L-PPS (linear polyphenylene sulphide) is ideal for use in screw compressors thanks to its outstanding resistance to heat and wear and its high strength and chemical stability.

For oil-free screw compressors, NSK offers angular contact ball bearings, four-point contact bearings and cylindrical roller bearings with outer-ring-guided brass cages. These boast improved accuracy for performance at high speeds and excellent precision. 

Our Innovations:
Angular Contact Ball Bearings

Cylindrical Roller Bearings

4 Point Contact Ball Bearings with outer ring guided brass cage for oil-free screw compressors


Conveyor Belts

Operating conditions: low speeds, medium to high loads, contaminated environments and high temperatures (for example during the transportation of petroleum coke)

In the petrochemical industry, conveyor belt systems are often used to transport raw materials. This places high demands on the bearings’ resistance to factors such as temperatures and contamination.

Total Quality Solution:
Our Self-Lube® HLT reduce maintenance, downtime and replacement costs in operation at extreme temperatures

Self-Lube® HLT bearing units were developed specially for this application. In addition to preventing contamination, they run at both low and high temperatures from −40°C to +180°C.



Operating conditions: high loads and speeds, high temperature

Ventilators are needed for a wide range of cooling processes. In most cases, these involve high speeds and temperatures that can reach up to 200°C.

Total Quality Solution:
Our NSKHPS Spherical Roller Bearings are state-of-the-art material technology bearings, suitable for high speeds & loads

Thanks to the materials used and special internal design, NSKHPS spherical roller bearings work precisely and reliably, even at limiting speeds up to 20% higher than conventional designs. We have also succeeded in increasing the dynamic load rating by up to 25%. The bearings are wear- and temperature-resistant. Their long service life also makes for lower maintenance costs.



Electric Motors

Operating conditions: high temperature, high speeds, vibrations

Electric drives for pumps, compressors, blowers and conveyor belt systems have to withstand high operating temperatures and high speeds.

Total Quality Solution:
High-temperature sealed deep groove ball bearings

This special range has been created to run in dusty environments and at high temperatures of up to 150°C. The seals are usually made from fluoroelastomer.

Electric motors


NSKHPS Angular Contact Ball Bearings

Designed for industrial machinery and applications in pumps and compressors: easy handling, long-life, low vibration and quiet running.  >>

High Capacity - HR Series

Larger rolling elements increase the dynamic load rating - helping improve machinery life performance.  >>

EM Series Roller Bearings

Features high load ratings and quiet running with precision machined tough one-piece cage.  >>

Cylindrical Roller Bearings with Outer Ring guided Brass Cage

Specially designed to meet the tough operating conditions found in oil-free screw compressors. >>

BMPC Angular Contact Ball Bearings

BMPC bearings designed to meet the rigorous demands of centrifugal pumps.  >>

Angular Contact Ball Bearing - Outer Ring Guided Brass Cage

Specifically designed to match the tough operating conditions found in oil-free screw compressors.  >>

4 Point Contact Ball Bearing with outer-ring brass cage (QJ Series)

Designed to reduce heat generation, vibration & noise in oil-free screw compressors.  >>
  • AIP - Added Value Programme

    AIP is a comprehensive programme to help customers reduce costs and much more... >>

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  • NSK Success Stories

    Customer cost savings is the best reference of our success. Example Success Stories by industry are listed below >>

  • Press Release

    Bearing substitution saves a Petrochemical refinery €27.845 per year >>


  • Bearings for Pumps and Compressors | Special Deep Groove Ball Bearings for Pumps, NSKHPS Angular Contact Ball Bearings, Special Bearings for Screw Compressors
  • Self-Lube Bearings | Bearing Units, Self-Lube, Silver-Lube, Molded-Oil, Life-Lube, Special Products and Bearings Solutions, Interchange list, Convertion tables

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