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 Lubrication
Tips for Reliability Professionals |
May
15, 2001 Subscribers: 6,688 |
“We would like to standardize on one brand of oil for all our gearboxes but the manufacturer of our worm gears tells us we shouldn’t use the EP (extreme pressure) gear oil we use for our reduction gears for this application. Why can’t you use EP oil for worm gears?”
Many EP gear oils contain sulfurous additives. These additives are designed to chemically bond to the metal surface of the gears and other components under boundary lubrication conditions to prevent welding of asperities on the two opposing surfaces. While vital in preventing metal-to-metal contact in boundary lubrication regimes, they can be corrosive under certain conditions, particularly to yellow metals such as copper, brass and bronze that are commonly used in industrial worm gears and other components.
The best approach to selecting the correct product for a given application is to gain a thorough understanding of the gear type, metallurgy and operating conditions of the component and to discuss these points with your lubricant supplier and equipment manufacturer. The correct lubricant can then be selected based on load, speed, operating temperature and additive requirements.
A graded pore filter is a filter whose pores become smaller
near the fluid exit.
Effects of Poor Grease Storage:
Separation of oil from thickener
Contamination with debris
Reaction of grease with atmospheric components such as:
- Oxygen
- Water and water vapors
- Carbon dioxide
Each tip published will earn the sender $10. Send your tips to webmaster@noria.com or fax to 918-746-0925.
"Water absorption filters usually have an element that combines a particle removal media with water absorption material. The water absorption material may be something as simple as cornstarch, or as complex as a polyacrylate material. The latter is the type of material used in babies' diapers to absorb water. Typically, these filters are used to remove small amounts (less than 1% by volume) of free water from hydrocarbon fluids in circulating systems.
Most water absorption media are sensitive to flow rate, and their efficiency improves as flow velocity is lowered. It is common for these filters to be used on off-line circuits where the flow rate can be controlled by pump selection."
For more information about the book "Filtration Technology" go to:
http://www.noria.com/secure/product_detail.asp?catalogid=49
Suggestions, Questions and Tip Submissions
Send questions and tip submissions to: webmaster@noria.com. Each tip published will earn the sender $10.
Other correspondence:
Noria Corporation
1328 E. 43rd Court
Tulsa, OK 74105 USA
Phone: 918-749-1400
Fax: 918-746-0925
Copyright © 2001, Noria Corporation. All rights reserved. Please do not reprint or host on your website without explicit permission. However, if you found this newsletter helpful, we grant you permission, and strongly encourage you, to e-mail it to a business associate or a friend. Thank you. The presence of advertising in Lube-Tips does not constitute an endorsement of the products or services in such ads. Further, because results will vary widely based on a number of factors, Noria Corporation cannot warrant the results, the accuracy or the completeness of any material published herein.
Lube-Tips is published by Noria Corporation. Oil Analysis and Lubrication Experts
