Machinery Lubrication magazine published by Noria Corporation
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ML PUBLISHER Mike Ramsey - mramsey@noria.com GROUP PUBLISHER Brett O'Kelley - bokelley@noria.com EDITOR-IN-CHIEF Jason Sowards - jsowards@noria.com SENIOR EDITOR Jim Fitch - jfitch@noria.com TECHNICAL WRITERS Jeremy Wright - jwright@noria.com Wes Cash - wcash@noria.com Alejandro Meza - ameza@noria.com Bennett Fitch - bfitch@noria.com Loren Green - lgreen@noria.com Michael Brown - mbrown@noria.com Garrett Bapp - gbapp@noria.com CREATIVE DIRECTOR Ryan Kiker - rkiker@noria.com GRAPHIC ARTISTS Patrick Clark - pclark@noria.com Terry Kellam - tkellam@noria.com Josh Couch - jcouch@noria.com Greg Rex - grex@noria.com ADVERTISING SALES Tim Davidson - tdavidson@noria.com 800-597-5460, ext. 224 MEDIA PRODUCTION MANAGER Ally Katz - akatz@noria.com CORRESPONDENCE You may address articles, case studies, special requests and other correspondence to: Editor-in-chief MACHINERY LUBRICATION Noria Corporation 1328 E. 43rd Court • Tulsa, Oklahoma 74105 Phone: 918-749-1400 Fax: 918-746-0925 Email address: jsowards@noria.com MACHINERY LUBRICATION Volume 15 - Issue 6 November-December 2015 ( USPS 021-695) is published bimonthly by Noria Corporation, 1328 E. 43rd Court, Tulsa, OK 74105-4124. Periodicals postage paid at Tulsa, OK and additional mailing offices. POSTMASTER: Send address changes and form 3579 to MACHINERY LUBRICATION, P.O. BOX 47702, Plymouth, MN 55447-0401. Canada Post International Publications Mail Product (Canadian Distribution) Publications Mail Agreement #40612608. Send returns (Canada) to BleuChip Interna - tional, P.O. Box 25542, London, Ontario, N6C 6B2. SUBSCRIBER SERVICES: The publisher reserves the right to accept or reject any subscription. Send subscription orders, change of address and all subscription-related correspondence to: Noria Corporation, P.O. Box 47702, Plymouth, MN 55447. 800-869-6882 or Fax: 866-658-6156. Copyright © 2015 Noria Corporation. Noria, Machinery Lubrication and associated logos are trademarks of Noria Corporation. All rights reserved. Reproduction in whole or in part in any form or medium without express written permission of Noria Corporation is prohibited. Machinery Lubrication is an independently produced publication of Noria Corporation. Noria Corporation reserves the right, with respect to submissions, to revise, republish and authorize its readers to use the tips and articles submitted for personal and commercial use. The opinions of those interviewed and those who write articles for this magazine are not necessarily shared by Noria Corporation. CONTENT NOTICE: The recommendations and information provided in Machinery Lubrication and its related information properties do not purport to address all of the safety concerns that may exist. It is the respon - sibility of the user to follow appropriate safety and health practices. Further, Noria does not make any representations, warranties, express or implied, regarding the accuracy, completeness or suitability of the information or recommendations provided herewith. Noria shall not be liable for any inju- ries, loss of profits, business, goodwill, data, interruption of business, nor for incidental or consequential merchantability or fitness of purpose, or damages related to the use of information or recommendations provided. Machinery Lubrication 5 500 miles of driving. Starts, stops, coast-downs, slow speeds and reverse-direction part move- ments are all oil film/viscosity starvation events. Temperature is another critical factor. Usually extreme temperatures are considered first and then normal operating temperatures. At the lowest temperature extreme, the oil must be fluid enough to enable movement and flow. At the highest temperature extreme, the viscosity must not be so low that surfaces are allowed to rub and collide, resulting in exca- vated working surfaces and failure. Viscosity index also plays a crucial role when tempera- tures are known to fluctuate widely. Typically, charts and formulas are used when selecting a lubricant's viscosity. Risk should also be a consideration. What is the likelihood of a viscosity excursion during normal or extreme conditions? What are the consequences? Safety, cost of repair, downtime, energy consumption and environmental factors should all be taken into account. It is easy to select viscosity for normal and generally constant-load conditions. However, extreme loading puts extreme demands on a lubricant's viscosity. This can come as a result of momentary shock or surge loading, mechanical unbalance and misalignment. Knowing when these conditions occur is essential. In many cases, the solution is not viscosity but rather film-strength additives. We all know that viscosity produces the working clearance between surfaces in relative motion with respect to speed and load. This clearance defines the machine's sensitivity to three-body abrasion from particle contamina- tion. The particles in the size range of this clearance create the greatest amount of abra- sion. For instance, if the working clearance is 10 microns, then the particles around 10 microns cause the most abrasion and pitting. The population of small particles in a lubricant is always much greater compared to large particles. The lower the viscosity, the thinner the working clearance and the more harm done by particle contamination. OTHER CAUSES OF VISCOSITY STARVATION As mentioned previously, the conditions that often starve a machine of viscosity can be momentary or temporary. High ambient heat or Chevron's ISOCLEAN ® Program: Your New Solution to Meeting Equipment Manufacturer's Fluid Cleanliness Requirements ©2015 Chevron U.S.A. Inc. All rights reserved. All trademarks are property of Chevron Intellectual Property LLC., or their respective owners. Typical Tank Bottom Typical Lubricant It's not clean until it's ISOCLEAN. www.chevronisoclean.com Chevron ISOCLEAN ® Certified Lubricant Patch Test Results