1 / 27

Friction Testing of Faces in Bearing Isolators and Oil Mist Lubrication

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

salena
Download Presentation

Friction Testing of Faces in Bearing Isolators and Oil Mist Lubrication

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Friction Testing of Faces in Bearing Isolators andOil Mist Lubrication By Hrishikesh Gadre

  2. 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

  3. 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

  4. Flat face seal basics Photo courtesy: Isomag Corporation

  5. Magnum C bearing Isolator Photo courtesy: Isomag Corporation

  6. Magnum S bearing Isolator Photo courtesy: Isomag Corporation

  7. 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.

  8. Experimental Apparatus LRI-1a Tribometer

  9. Test samples Rotor Stator

  10. Experimental Apparatus Rotor Stator Temperature probe

  11. Experimental Apparatus Modifications for introducing Oil Mist

  12. 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.

  13. Results • COF decreases as load increases. • It increases with increase in speed. • Presence of oil helps reducing the friction. • Temperature is also comparatively lower.

  14. Part II: Oil Mist Lubrication

  15. Introduction • Need for this kind of lubrication. • Centralized lubrication system. • Where it is successfully used? • Hydrocarbon processing industry, refineries • Process pumps, electric motors

  16. 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

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

  18. Main header Application point Photo courtesy: Bloch & Shamin

  19. Reclassification • Type of fitting – depends upon the application • Low speed – Condensing type • High speed – Mist or Spray type Photo courtesy: Bloch & Shamin

  20. Typical Oil-Mist system Photo courtesy: Bloch & Shamin

  21. Dry sump Vs Wet sump Dry sump Wet sump Photo courtesy: Bloch & Shamin

  22. 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

  23. Case study

  24. Acknowledgement • Dr. Michael Khonsari. • Center for Rotating Machinery. • David Hertel. • Michael Ciolino. • Everybody in this group who helped me.

More Related