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Friction Testing of Faces in Bearing Isolators and Oil Mist Lubrication. By Hrishikesh Gadre. Outline. Part I: Testing of seal faces. About Isomag Bearing Isolators. Problem definition. Experimental Apparatus. Part II: About Oil Mist Lubrication. Introduction

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Presentation Transcript
outline
Outline
  • Part I: Testing of seal faces.
    • About Isomag Bearing Isolators.
    • Problem definition.
    • Experimental Apparatus.
  • Part II: About Oil Mist Lubrication.
    • Introduction
    • Generation, Transportation and Reclassification
    • Typical Oil-mist system
    • Dry sump Vs Wet sump oil mist system
    • Lubricants
bearing isolators
Bearing Isolators
  • Isolate the bearings from outside environment.
  • Prevents oil from leaking.
  • Combine the advantages of labyrinth and contacting seal faces.
  • Magnetic force as a closure means.
  • Runs dry as well as lubricated.

Photo courtesy: Isomag Corporation

flat face seal basics
Flat face seal basics

Photo courtesy: Isomag Corporation

magnum c bearing isolator
Magnum C bearing Isolator

Photo courtesy: Isomag Corporation

magnum s bearing isolator
Magnum S bearing Isolator

Photo courtesy: Isomag Corporation

problem statement
Problem Statement
  • ExxonMobil uses these isolators.
  • Usage hasn’t been for long enough to determine life of the isolator.
  • Aim is to conduct various tests to calculate the wear life and/or to suggest a better solution.
  • Effect of introduction of Oil Mist.
  • Also, performance of another material pair.
experimental apparatus
Experimental Apparatus

LRI-1a Tribometer

test samples
Test samples

Rotor

Stator

experimental apparatus10
Experimental Apparatus

Rotor

Stator

Temperature

probe

experimental apparatus11
Experimental Apparatus

Modifications for introducing Oil Mist

testing outline
Testing outline
  • Parameters that can be changed:
    • Pressure: 5, 7, or 12 psi.
    • Speed: 1800 or 3600 rpm.
    • Material pair: 17-4PH – Composite or SS 416 – Carbon.
    • Lubrication: Dry or mist lubricated.
  • Total of 24 tests.
results
Results
  • COF decreases as load increases.
  • It increases with increase in speed.
  • Presence of oil helps reducing the friction.
  • Temperature is also comparatively lower.
slide17

Part II:

Oil Mist Lubrication

introduction
Introduction
  • Need for this kind of lubrication.
  • Centralized lubrication system.
  • Where it is successfully used?
    • Hydrocarbon processing industry, refineries
    • Process pumps, electric motors
generation of mist
Generation of mist
  • Vortex type or Venturi type.
    • Air with high speed and low pressure at exit.
  • Low pressure pulls oil.
  • High speed air breaks the oil.
  • Optimum size of particles.
    • Line condensate
    • Stray mist

Photo courtesy: Bloch & Shamin

transportation
Transportation
  • Can be conveyed over long distances.
  • 97% of the mist reaches the application point.
  • Optimum velocity of flow.
    • Gravitational settling
    • Turbulent settling
slide21

Main header

Application point

Photo courtesy: Bloch & Shamin

reclassification
Reclassification
  • Type of fitting – depends upon the application
  • Low speed – Condensing type
  • High speed – Mist or Spray type

Photo courtesy: Bloch & Shamin

typical oil mist system
Typical Oil-Mist system

Photo courtesy: Bloch & Shamin

dry sump vs wet sump
Dry sump Vs Wet sump

Dry sump

Wet sump

Photo courtesy: Bloch & Shamin

lubricants
Lubricants
  • Virtually any oil can be used.
  • Some specific properties needed.
    • Good aerosol characteristics
    • Thermal and oxidation stability
  • Special additives designed.
    • To reduce stray mist
    • Anti-wear, anti-foaming etc
acknowledgement
Acknowledgement
  • Dr. Michael Khonsari.
  • Center for Rotating Machinery.
  • David Hertel.
  • Michael Ciolino.
  • Everybody in this group who helped me.