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Introduction

A 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 carried out 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 Plummer Blocks and labyrinth seals, along with recommendations for correct lubrication intervals and quantities.
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 resulted in need for use of compressed air, adding to the cost of the operation.
  • Incorrect lubrication amounts and frequencies
  • NSK Solution: NSKHPS Spherical Roller Bearings with SNN Plummer Blocks and Labyrinth seals
  • Significant cost saving generated by removing the compressed air.
  • Dust Extraction Fan
  • SNN Plummer Block

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 Plummer Blocks and labyrinth seals and suggested changes in the lubrication amount and intervals
  • Trial conducted, with NSK Engineering overseeing the installation and implementation of NSK recommendations
  • The customer benefited from increased productivity, reduced maintenance costs and the removal of compressed air resulting in a significant cost saving

Product Features

  • Equipped with 2 lubrication holes and 1 draining hole
  • Solid corners in the base for locating pins
  • Square shape and centre marks
  • High grade casting - allows 5 different sealing arrangements:

    - Double lips seals / V-ring seals / Felt seals / Labyrinth seals / Taconite seals

  • Easy assembly, easy alignment
  • High rigidity (minimises deformation of the bearing seat)
  • Comprehensive range of sealing & arrangements to match all needs
  • Good heat transfer
  • Same housing can be used with both double row self-aligning ball bearings or double row spherical roller bearings
  • Low maintenance costs

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
Cost of compressed air to cool bearings $95,323 Eliminate need for compressed air $0
No additional costs due to NSKHPS Spherical Roller Bearings with SNN Plummer Blocks and labyrinth seals $0
Total Costs $95,323

Reference:SS-E-2049

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