Machinery Lubrication magazine published by Noria Corporation
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oil ways, etc.). Leaks may also occur suddenly in areas where there was no leakage. For more information on this condition, see my article on oil clotting and the adrenaline effect at Machin- eryLubrication.com. Unlike an SVOC, where perhaps only 40 percent of the actual oil charge is drained (see Figure 1), a full-volume oil change (FVOC) can take much longer. Additionally, there is much more oil involved and higher associated costs. at said, the service life of an FVOC should be disproportionally longer than an SVOC. For example, the life of an FVOC may be three times longer than a 40-percent SVOC (40 percent new oil blended with 60 percent used oil), and this assumes the used oil is relatively healthy and contaminant free. One way to define a lubricant's remaining useful life (RUL) in a machine is to identify the remaining useful life of the additive system. Most additives are sacrificial. In other words, they give up their life to save the oil and the machine. As such, if they don't die, they aren't effective. While they are working, they are depleting. Eventually, no reserve additives are left. Of course, you should change the oil long before this point. For simplicity, let's assume the antioxidant concentration of new oil is 100. At the time of the SVOC, the used oil had an antioxidant level of 25. e 40-percent SVOC resulted in a blended antioxidant concentration of 55, or 55 percent RUL of the blended oil. is equates to just more than half of the new oil's designed service life. Lurking Dangers Perhaps the most serious hazard relates to current oxidation of the oil being drained. ese oxides spread rapidly like food coloring in a pitcher of water. ey typically consist of chem- ically reactive hydroperoxides and free radicals that can burn through antioxidants coming in with the new oil in short order. You might think of these reactive chemicals as an infection. It's like sending nine healthy people into a room with a person ailing from a contagious disease. The good health of the nine doesn't cure the disease of the one. On the contrary, you end up with 10 very 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 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 Josh Couch - jcouch@noria.com Greg Rex - grex@noria.com ADVERTISING SALES Tim Davidson - tdavidson@noria.com 800-597-5460, ext. 224 MEDIA PRODUCTION COORDINATOR Libby Bahlinger - lbahlinger@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: editor@noria.com MACHINERY LUBRICATION Volume 17 - Issue 6 November-December 2017 ( 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 © 2017 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 Lubri - cation 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 inter - viewed 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 responsibility 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 recommen - dations provided herewith. Noria shall not be liable for any injuries, 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 Figure 1. In many large-volume circulating oil systems, changing the tank oil alone results in nearly 40 percent of the full volume being drained and changed. 40% Oil Volume 60% Oil Volume