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mechanicalSOLUTIONS small (less than 10µm) particulate is to be expected under normal operation; therefore, keeping a trend of particle count is more helpful than a single particle count for assessing bearing performance. A spike in particle count during steady operation (few starts and stops) is indicative of external contamination or abnormal wear. Particles of 10µm or larger are on the same magnitude as the oil film thickness, and should be kept to a minimum in order to prevent abnormal wear. A very practical tool for analyzing oil samples in the field is an oil patch test kit. An oil patch test can be used to get quick test results of the contamination level in the oil without waiting for results from a laboratory. In addition to oil sampling, monitoring the bearing operating temperature can detect changes in oil conditions. High levels of contamination and degradation result in increased friction and oil film breakdown, which will lead to a rise in operating temperature. Oil type The recommended oil for oil film bearings is a premium grade, industrial mineral oil or turbine oil, with rust and oxidation inhibitors and anti-foaming agents. Extreme pressure (EP) additives are not recommended. Oil viscosity is determined individually for each application and is based on bearing clearances, loads, temperatures, and speeds. For units operating in hot or cold climates, synthetic oils can be considered which will not thicken as much at low temperatures and which will have better oxidation resistance at high temperatures. Conclusion Oil discoloration in oil film bearings is a visible indication of oil contamination or degradation. Contamination comes in two main forms: particulates and liquids. Particulates can either be ingested from the environment or come from inside the bearing. Liquid contaminates can come from the environment, but they can also be inadvertently added to the bearing in the form of incompatible cleaners and lubricants. Oil degradation will naturally occur over time through oxidation. Regardless of the source, significant oil discoloration should be addressed with high importance. Slight discoloration does not necessarily indicate a problem. The lubricant supplier ultimately determines the acceptability. Oil is the lifeblood for oil film bearings, and maintaining proper quality through regular oil replacement and analysis will greatly increase the longevity and reliability of the bearings. P E input #45 at www.plantengineering.com/information Andrew Myers is a Baldor applications engineer for Dodge Sleeve Bearings. 92 • November 2012 plant engineering
PRODUCTMART Plant Engineering’s electronic newsletters deliver news and information on the latest trends in manufacturing in every corner of the plant floor. Plant engineers and managers refer to these sources for the up-to-theminute news and trends. • PlantMail: published Weekly • HotWire: published Monthly • Maintenance Connection: published Monthly • Product Showcase: published Monthly • Energy Management: published Monthly • Safety & Security: published Monthly It’s time to get your plant ahead of the curve. Subscribe today. www.plantengineering.com/newsletters PLANT ENGINEERING E-NEWSLETTERS Why Should You Filter Your Water Scale formation reduces the heat transfer rate and increases the water pressure drop through the heat exchanger and pipes. In fact, one study has shown that .002" fouling will increase pumping needs by 20%. The Best Engineered Water Filtering Solution Always Costs Less 2 672 S. La Cienega Bl vd. Los Angeles, C A 90034 US A (800) 336-1942 (310) 839-2828 F ax: (310) 839-6878 www. t ekleen.com inf o@t ekleen.com Input #100 at plantengineering.hotims.com ple201211_enewslttr_325x425.indd 1 “OFF” Button Switch rated plugs & receptacles enable quick motor connection and disconnection. Safety features protect from electrical hazards and maintain NFPA 70E hazard risk category 0. Operates as line of sight motor disconnect. Also an ideal Welding Receptacle 800.433.7642 • meltric.com Input #101 at plantengineering.hotims.com 11/5/2012 5:04:55 PM PORTABLE FALL PROTECTION No Holes! OSHA Compliant The Industry Leader! 763-694-2614 www.railguard.net Input #102 at plantengineering.hotims.com Fall Protection from FabEnCo 3.5" – wide The x Safety 4.5" high Gate Company Pantone American-made 382c FabEnCo XL Self Closing Safety Gates offer more vertical coverage wherever fall protection is needed. Gates are available in carbon steel, aluminum and stainless steel. FabEnCoat finishes include galvanized and safety yellow powder-coated. Custom gates are also available. www.safetygate.com/ple Input #103 at plantengineering.hotims.com Reach your Audience! Place your Ad in PLANT ENGINEERINGS’ Product Mart or Classifieds section, call today and get results! 630-571-4070 PLANT ENGINEERING November 2012 • 93
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What’s INside November 2012 Volum
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PlantEngineering.com 1111 W. 22nd S
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Machining without Coolant! Watch Th
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Quick change artist Insulating is a
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TWO GREAT COMPANIES. ONE BRIGHT FUT
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Maximize Uptime and Profits Through
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Compact gearhead The Nexen Harmonic
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Comfort panels The SIMATIC HMI Comf
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Compressed Air Air nozzle EXAIR’s
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Line of actuators The Tritex II dc
Page 43 and 44: Energy Management Device and data m
Page 45 and 46: Fluid Handling Fluid recycling solu
Page 47 and 48: Lighting Color-consistent LED Colum
Page 49 and 50: Maintenance Tools & Equipment Heavy
Page 51 and 52: Materials Handling Systems Air cast
Page 53 and 54: Power Transmission Operator safety
Page 55 and 56: Productivity Training Software Blen
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Page 71 and 72: The new Fluke 805 Vibration Meter i
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2012 - PageSuite

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