Used up to 350 F. Inexpensive and used where good adhesion and corrosion protection required. When it comes to selecting lubricating oils for manufactured equipment, it’s easy to determine which products meet the original equipment manufacturer (OEM) requirements. The most common NLGI grade is two and is recommended for most applications. Different types of greases are typically formulated with three grease components: base oil, thickener and additives. Used in food grade, corrosive and high-load environments. Most performance-enhancing additives found in lubricating oils are also used in grease formulation and should be chosen according to the demands of the application. If your supplier is unsure of the compatibility, ask that an ASTM 6185 compatibility test be performed. Most common food grade thickener with H1 approval. Complex lithium soaps are the fastest growing thickener type worldwide. SKF has developed several tools in order to facilitate the selection of the most suitable lubricant. This table was originally sourced from a release by National-Spencer, Inc. Has good high temperature characteristics, with a dropping point approximately 500°F, excellent... Bentone (Clay) Grease. The following formulae are used to calculate—by weight—the correct amount of grease to apply to a rolling bearing. Most users are aware of the importance of selecting the right lubricant for a given application. Now for that extra step: The consistency of grease is controlled by the thickener concentration, thickener type and the viscosity of the base oil. Paul Grives, Global Services & Grease Marketing Manager, ExxonMobil Fuels & Lubricants. Meters can be purchased to measure the exact amount of grease in ounces, grams, cubic inches and cubic centimeters. Used up to 350 F. Good water resistance and H1 approval. The most common types are simple lithium soaps, lithium complex and polyurea. Be sure to calibrate all of your grease guns and use one particular type per application. A common mistake when selecting a grease is to confuse the grease consistency with the base oil viscosity. Such applications include high or low operating temperatures, a wide ambient temperature range, or any application where extended relubrication intervals are desired. Assume we had 0.5 ounces in 10 shots. What does it mean when your grease has an NLGI Grade 00? Figure 1 assumes the base oils’ viscosity index. Grease of choice for electric motors and sealed-for-life applications. Common Grease Types and Characteristics Aluminum Complex Grease. Table I, compiled by the National Lubricating Grease Institute (NLGI), illustrates the consumption of grease in North America in 2008. Lubricators should have specific instructions in work orders on the exact amount of grease to add to a bearing. You may have put a lot of effort and money into selecting the best quality grease in the pursuit of lubrication excellence. NDm = rpm * (( bearing bore + outside diameter) / 2). t = K [ 14,000,000 _ 4d ] n dt = relubrication interval in hoursd = bearing bore diameter, mmn = speed, rpmK = 1 for spherical or tapered roller bearingsK = 5 for cylindrical or needle bearingsK = 10 for radial ball bearings. Let me try to demystify grease a bit. The general rule is to use oil for lubrication, if possible, because of the ability to clean and cool oil versus doing so with grease. But don’t confuse the quality of the lubricant with the quality of the specification. © 2020 Efficient Plant. Relubrication frequency…Once we have calculated the right amount for a rolling element bearing, we then have to establish lubrication frequencies for that bearing. When in doubt, always consult your lubricant supplier. Figure 2 shows some common additive requirements by application. Used in steel and paper mills. Each of these describes a type of grease but there are also many other names and applications. The NDm value uses pitch diameter rather than bore diameter because not all bearings of a given bore have the same element diameter, and thus have different surface speeds. Therefore, 0.83 ounces required for the bearing using a 20-shot-per-ounce gun results in applying 0.83 × 20 = 17 shots. A more complex structure can be formed by using a complexing salt. Versatile and less expensive than the Li Complex. This is approximately 1 ounce of grease. It may seem counterintuitive, but higher speed factors require higher consistency greases. There are several common methods for determining minimum and optimum viscosity requirements for element bearings, most of which use speed factors, commonly denoted as DN or NDm. Simple lithium soaps accounted for 58% of the worldwide production in 2008, while lithium complex accounted for 15%. This is of the utmost importance as incompatible greases will usually lead to a softening of the thickener resulting in oil being released; that chain of events can result in equipment failure. The bearings have wide, deep axial grooves, extending about 80% along the bearing. Lithium grease is also available in white so that one may easily see the amount of new grease that has been added. Getting them right is crucial in improving (and ensuring) the reliability of the equipment within your operations. When greasing, completely displace the old grease by observing fresh grease from the bearing. This equates to 0.05 ounces per shot, which converts to 20 shots per ounce for that particular gun. Part I of this article provided a basic introduction to grease, with discussions of composition, types, properties and evaluation tests. Complex greases such as lithium complex provide improved performance particularly at higher operating temperatures. LE’s industrial greases are formulated with a variety of thickener types, including lithium complex, calcium sulfonate, clay (bentone), and polyurea; and they come in a range of NLGI grades. This is the advantage of using an automated system, such as single-point lubricators and centralized grease systems. Proper grease specification requires all of the components of oil selection and more. Grease applicationOnce the correct grease has been selected, it has to be applied properly with the right amount at the right frequency. Using this information alone, one could select the right consistency and thickener type. This converts the thickener to a soap‑salt complex, hence the term complex grease. Also used in food plants. Most greases are formulated using API Group I and II mineral oil base stocks, which are appropriate for most applications. Simple lithium soaps are more widely used because of their lower costs, but lithium complex greases, because of their inherently better properties, are faster growing. LMT. A more complex structure can be formed by using a complexing salt. hbspt.cta.load(3951034, 'c99217f3-09e7-4751-bc3a-7739dac44a0e', {}); Product Unboxing - Simalube Single-Point Automatic Lubricators, How to Calculate Grease Quantity and Frequency for Bearings, 7 Steps to Trouble-free Grease Lubrication, Product Unboxing - The Conserver® Oil Purification Unit, Product Unboxing - AMETEK Spectro Scientific FerroCheck 2100, Advances in the Analysis of New and Used Lubricating Oils by High-Resolution ICP-OES, The Cost Effective Benefits of a High Performance Kidney Loop System, How to Cost Justify a Lubrication Program, *Depends on other factors as well, including bearing type, thickener type, base oil viscosity and base oil type. Armed with this generic specification, it is easy to select the right product no matter what brand is preferred. Table IV reflects a practical consolidation option to consider. Table 1 provides a general guide to selecting NLGI grade based on speed factor and operating temperature. Another thickener type that is becoming more popular is polyurea. There are, however, many applications where oil use is not possible or practical. The next step is to calculate the number of shots per ounce the grease gun delivers. With so many options, understanding your needs is important when selecting grease. The NLGI has established a scale to indicate grease consistency which ranges from grades 000 (semifluid) to 6 (block grease). For bearings, speed factor and operating temperature can be used to determine the best consistency or NLGI grade for a given application. That’s because the majority of bearings in a typical industrial plant are grease lubricated. While it may be one of the oldest lubricants known to man, grease continues to be a vital part of any lubrication program. Table VII reflects guidelines for the selection of NLGI grades. Sometimes while trying to consolidate lubricants, it is easy to overconsolidate.
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