Machinery Lubrication magazine published by Noria Corporation
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Machinery Lubrication PUBLISHER Mike Ramsey - mramsey@noria.com GROUP PUBLISHER Brett O'Kelley - bretto@noria.com FAILURE OCCURRENCE FACTOR (FOF) FAILURE OCCURRENCE FACTOR METHOD A. MACHINE RELIABILITY HISTORY IS KNOWN 1 Never Machine has long history, has never been known to fail and is showing no signs of impaired reliability. 2 Very Rare Machine is highly reliable, and past failures have been extremely rare (15+ years of service life). 3 Rare Machine can go more than 10 years without failure. 4 Infrequent Machine has been known to fail but only after 5 or more years. 5 Occasional Failures can occur in the time range of 3 to 8 years. 6 Common and Likely Failures are likely after 3 to 5 years' service life. 7 Somewhat Frequent Failures tend to occur after 2 to 5 years' service life. 8 Frequent Failures tend to occur after 1 to 3 years' service life. 9 Very Frequent Failures occur frequently in 0.5 to 2 years' service life. 10 METHOD B. MACHINE RELIABILITY IS UNKNOWN Chronic and Failures are expected in less than 1 year's Certain service life. Understand the Reliability-Risk Connection The probability of machine failure needs to be inversely proportional to risk. There's no better example than commercial aviation. Because the consequences of failure are extremely high (death), the probability of failure SENIOR EDITOR Jim Fitch - jfitch@noria.com TECHNICAL WRITERS Jeremy Wright - jwright@noria.com Wes Cash - wcash@noria.com Bennett Fitch - bfitch@noria.com Complete The Reliability Elements Quotient Figure 2. Use this table to determine the Failure Occurrence Factor, corresponding to the probability of failure. I've written previously about the Optimum Reference State (ORS). This is the prescribed state of machine configuration, operating conditions and maintenance activities required to achieve and sustain specific reliability objectives. As stated, defining the ORS requires a definition of the specific reliability objectives for a given machine. Defining the reliability objectives demands an understanding of failure modes and machine criticality. This reminds me of the plant manager who told me years ago that he decided the best way to solve his lubrication problems was to put synthetic lubricants in every machine. Do you think he got the result he sought? Does paying a premium for synthetics guarantee a premium return in machine reliability and maintenance cost reduction? Do synthetics offer forgiveness for negligent and shoddy maintenance? Is this wise decision-making? EDITOR-IN-CHIEF Jason Sowards - jsowards@noria.com must be equally low (extreme reliability). It is the only practical means to hedge risk. Those responsible for maintenance usually have little control over the consequences of failure (often limited only to early detection technology). However, reliability maintainers frequently have considerable control over the probability of failure. Indeed, you can use risk and criticality to develop a master plan for lubrication-enabled machine reliability. This will be the focus of this article. Let's begin with a list of common lubrication and oil analysis decisions (all attributes of the ORS) that can be customized (optimized) by understanding failure modes and machine criticality: • Lubricant selection, e.g., premium vs. economy-formulated lubricants • Filtration, including things such as filter quality, pore size, capture efficiency, location and flow rate • Lubricant preventive maintenance (daily PMs) and inspection strategy • Lubricant delivery method selection and use (e.g., circulating, auto-lube, mist, etc.) CREATIVE DIRECTOR Ryan Kiker - rkiker@noria.com GRAPHIC ARTISTS Steve Kolker - skolker@noria.com Julia Backus - jbackus@noria.com Terry Kellam - tkellam@noria.com ADVERTISING SALES Tim Davidson - tdavidson@noria.com 800-597-5460, ext. 224 MEDIA PRODUCTION MANAGER Rhonda Johnson - rjohnson@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 E-mail address: jsowards@noria.com MACHINERY LUBRICATION Volume 13 - Issue 2 March-April 2013 (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 International, 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 © 2013 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 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 recommendations 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. • Oil analysis (which machines are included and which are not?) March - April 2013 |3