NSK Case Study


Dust Extraction Fan

Cost Savings: $95,323

An ore preparation plant was experiencing high temperatures within a dust extraction fan. The bearing temperature was cooled down at considerable cost by using compressed air. NSK Engineering conducted an Application Review including a temperature survey revealing major issues with the sealing. Operating at high speed caused the seal lip to burn off and over-lubrication contributed to the high running temperature. NSK recommended using NSKHPS Spherical Roller Bearings with SNN Pillow Blocks and labyrinth seals, along with recommendations for correct lubrication intervals and amounts. A trial was conducted resulting in a considerable temperature reduction and significant cost savings by removal of the compressed air.

Key Facts

arrow-right-red Dust extraction fan application
arrow-right-red High bearing temperatures in operation
arrow-right-red Extraordinary measures – compressed air – required to countermeasure temperature rise
arrow-right-red Incorrect lubrication amounts and frequencies


Dust Extraction Fan

Value Proposals

arrow-right-red NSK engineering conducted an Application Review including a Temperature Survey and a Bearing
Condition Report
arrow-right-red NSK engineering recommended NSKHPS Spherical Roller Bearings in combination with SNN Pillow Blocks and labyrinth seals
arrow-right-red Modifications to lubrication amounts and intervals
arrow-right-red Trial conducted, with NSK Engineering overseeing the installation and implementation
arrow-right-red The customer benefited from increased productivity, reduced maintenance costs and the elimination of compressed air, resulting in a significant cost savings

Product Features

arrow-right-red Manufactured from grade 200 cast iron
arrow-right-red High precision bore for optimum bearing seating
arrow-right-red Split block design allows for easy mounting and dismounting of pre-assembled shafts
arrow-right-red Available for shaft diameters from 20 to 140 mm and/or 3/4” to 5 1/2”
arrow-right-red Threaded lubrication hole(s) on the cap and 1 drainage outlet on the base
arrow-right-red Dimples on the housing surface facilitate additional holes for sensors, lubrication, mounting bolts or locating pins
arrow-right-red Large oil bath to maximize oil change intervals
arrow-right-red Good heat transfer
arrow-right-red Contact and non-contact seal options
SNN Pillow Block and
NSKHPS Spherical Roller Bearing

Cost-Savings Breakdown

  Before Cost NSK Solution Cost  
  Cost_Saving_Maintenance Compressed air to cool bearings $95,323 Eliminate need for compressed air $0  
  Total Costs $95,323 Total Costs $0  
Before Cost
Cost_Saving_Maintenance Compressed air to cool bearings $95,323
Total Costs $95,323
NSK Solution Cost
Cost_Saving_Maintenance Eliminate need for compressed air
Total Costs $0

Your Partner for Machine Optimization

Our AIP Added Value Program is based around a simple proposition: ‘improvement pays’. By working with you throughout the AIP Value Cycle, we will help you achieve improvements in machine reliability, productivity and performance, all of which carry a tangible and measurable cost benefit – and we have the tools to prove it! That’s what we mean by improvement pays.