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

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

Dust Extraction Fan

Value Proposals

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

Product Features

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

Cost-Savings Breakdown

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