Machinery Lubrication July August 2008

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NLGI UPDATE Introducing the Latest Word on Grease BY DAVID COMO, DOW CORNING CORPORATION Are you aware that some calcium-thickened greases may start to melt and break down at 95°C (200°F), while some complex or clay-thickened greases can approach 260°C (500°F) intact? Did you know that polyurea-thickened greases are inherently less susceptible to oxidation than their metal ion-containing brethren thickened with soaps? How about the historical fact that traces of materials similar to those used to form today’s complex greases were found on chariot hubs from as far back as 1400 B.C.? These bits of information and more can be found in one compact and easy-to-understand handbook, the NLGI Lubricating Grease Guide (LGG), which was originally published nearly 25 years ago. In the past, matters of lubrication training on the shop floor had been left to either the technician being replaced or the guy working at the next bench. It happened similarly in the original equipment (OE) design area. This results in untrained people passing on their practices to other untrained people, which invariably leads to misinterpretation and miscommunication. For Reference With today’s reduction in workforce and budgets, and higher pressure on uptime, little time is allowed for comprehensive training in the workplace. As a result, more of those budgets is being spent on “fighting fires”. Much of this time and expense is attributable to failures due to lubricationrelated failures. The LGG is not intended to replace quality intensive training, such as that offered by organizations like NLGI and Noria Corporation, but rather The Guide serves as a supplement and reference for that information. NLGI has now published its fifth edition of the NLGI Lubricating Grease Guide (LOCCN: 84-61641; ISBN: 0- 9613935-1-3) which contains nine chapters of easily accessible information covering topics from historical and technical aspects differentiating greases to the manufacture, testing, application and troubleshooting of lubricating greases. It has been the first source of technical information for anyone either entering the grease industry or involved in daily maintenance operations – as well as a regular reference for those of us who have been in the business for a while. Chapters of Insight The first four chapters give the reader a fundamental background of where grease comes from historically, what goes into making it, how it is tested for quality and performance, and how the various combinations of grease thickeners and base oils compare. Technically minded but chemically challenged folks will find that the chemistry of what goes into a grease is both accessible and sensible, and this is covered in a painless three or four pages. It is good to have a basic understanding of this material, even for mechanical-type personnel. The manufacturing chapter is interesting from the standpoint that there are quite a number of ways to produce the grease, and there are a variety of downstream processes possible. It’s almost as interesting as visiting an actual grease manufacturing plant in person. The chapter on testing is good reference as well, especially when you’re trying to decipher what a grease supplier is calling out on its technical data sheets. The following four chapters discuss when grease is used (vs. oils), which grease to use when, how to handle and dispense it, and some thoughts on troubleshooting problems. This is the “good stuff” for those of us who are actually specifying or choosing and using the grease. What will one thickener type do better or poorer than another (for example, calcium vs. lithium soap)? Which grease is a food–grade grease? What about water resistance? What are the principal uses of the different grease types? 54 July - August 2008 machinerylubrication.com Machinery Lubrication
These chapters provide a good working background for the knowledgeable application of grease. This is followed by information on safe handling procedures and some useful reference material – including a glossary of terms and abbreviations of which I kept a copy tucked safely behind my pocket protector for several years. Very handy stuff! Continuing Education As stated earlier, there is no substitute for independent, qualified and experienced providers of information and education. If you’re reading this article, you are obviously already familiar with at the education Noria provides through its publications and seminars. NLGI provides another tool which is tailored to the grease industry and the proper formulation, manufacturing and application of lubricating greases. The NLGI Lubricating Grease Guide can also help solidify your learnings around grease lubrication and act as a primary reference for the future. About the Association The NLGI is a not-for-profit trade association, composed primarily of companies who manufacture and market all types of lubricating grease. NLGI promotes the technical advancement of grease lubrication, and contributes materially to greater production, increased machine life and a higher quality of machine performance through better lubrication. For more information, visit www.nlgi.com. Machinery Lubrication machinerylubrication.com July - August 2008 55
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CONTENTS July - August 2008 Feature
Page 5 and 6: temperatures flanked by metal parti
Page 8: VIEWPOINT When It Comes to CBM, Ins
Page 12: HYDRAULICS AT WORK BRENDAN CASEY Wh
Page 17 and 18: FROM THE FIELD How Effective Is You
Page 19 and 20: obtained from advances in the progr
Page 21 and 22: There is another solution: New addi
Page 24: CASE STUDY Storage and Dispensing S
Page 27 and 28: detail,” Kubera said. “Before w
Page 30 and 31: CONTAMINATION CONTROL forming a bar
Page 32 and 33: CONTAMINATION CONTROL Copper Passiv
Page 34 and 35: CONFERENCE REVIEW Lubrication Excel
Page 36: LUBRICATION 101 Basic Wear Modes in
Page 39 and 40: oughened surfaces cause cutting and
Page 41 and 42: in the area and inadequate groundin
Page 44: PRODUCT IDEAS Absorbent Pads Oil Ea
Page 48 and 49: LUBRICANT APPLICATION On a microsco
Page 50: LUBRICANT APPLICATION Bakery At Mar
Page 53 and 54: Polyethylene bulk oil tanks. Comple
Page 58 and 59: CERTIFICATION NEWS ICML Reaps Benef
Page 60 and 61: BACK PAGE BASICS What’s Contamina
Page 62: BACK PAGE BASICS but insufficient f
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Machinery Lubrication July August 2008

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