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Written by Preston Walker, Jr., Caliber Pump Repair
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Knowing the basics of pump repair can simplify preventive maintenance.
Technical manuals with specifications like tolerance and pressures are important tools for troubleshooting hard-to-fix problems. General shop tools and a range of wrenches, sockets and screwdrivers are also helpful. Packing pullers, grease guns and the proper lubricants save time and money.
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Written by Steven Katz, Emerson Bearing
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Rolling bearings are precision machine elements found in a wide variety of applications. They are typically reliable even under the toughest conditions. Under normal operating conditions, bearings have a substantial service life, which is expressed as either a period of time or as the total number of rotations before the rolling elements or inner and outer ring fatigue or fail. Less than 1 percent (0.35 percent specifically-see Figure 1) of rolling bearings do not reach their expected life. (Source: FAG Bearing Antriebtechnik 18 from 1979.)
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Written by Brian Richards, SKF USA Inc.
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Lubricants for rotating machinery primarily serve to separate rolling and sliding contact surfaces, protect highly finished bearing surfaces from corrosion, protect against contaminants (in the case of grease) and serve as a heat-transfer medium (in the case of oil). An effective lubricant management program-grounded in proper lubricant monitoring and analysis practices-can help reinforce these functions and, in the process, deliver vital information about the machinery's condition and health.
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Written by Pat Trentler and Jim Jenkins, Quadna, Inc.
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Babbitt Bearings
Babbitt bearings, frequently found in large steam turbines and generators in major power plants, can provide years of service if properly maintained. By using state-of-the-art technology and repair practices, aftermarket suppliers who specialize in Babbitt bearings can repair equipment and increase the life of Babbitt bearings by:
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Written by Glenn H. Phelps, Metallized Carbon Corporation
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Pumps and Systems, July 2009
What is the secret to continuously baking or processing cakes, pizza, chicken, beer and thousands of other foods and beverages? Mechanical carbon materials used in the food processing equipment produce these foods safely and cost effectively. Oil/grease free, self-lubricating, mechanical carbon materials are used in conveyors on processing lines, packaging lines and food handling canning machines. Their use solves problems associated with typical oil/grease lubricants, which may contaminate food or cause equipment failure.
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Written by Alexandra Ferretti
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Pumps and Systems Success Story of the Year 2010 Winner
When a component of a large circulating water pump fails in a power plant, the power plant must often spend hundreds of thousands of dollars to remove the pump from service, replace the failed component, rebuild the pump and return it to service. In addition, circulating water pumps can require work on a massive scale-they can measure 30 ft or more in length and pump an average of 165,000 gpm. Rotating shafts for these pumps can measure 8 to 10 in. in diameter.
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Written by Jeff Anderson, Waukesha Bearings Corporation and Kevin Terrasi, Pump Engineering, Inc.
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Pump manufacturers in a variety of industries are increasingly asked to deliver more with less; they need to handle increased loads with improved system efficiency but reduce envelope, environmental impact and total system cost. As an added challenge, many of these applications are running in low viscosity process fluids. Such applications include chemical processing, mine-dewatering, seawater lift, subsea booster, water injection and desalination pumps.
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Written by Hydraulic Institute
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Q. Our pumps take their suction from an open tank. When the liquid level drops, surface vortices are formed that allow air to be drawn into the pumps. What changes can be made to the tank to correct this problem?
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Written by Craig Cooley and Tim Sexton, US Synthetic Bearings and Ken Bertagnolli, US Synthetic
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It has been 54 years since Tracy Hall invented the first manmade diamond at the General Electric (GE) laboratories in Schenectady, New York. Since then, synthetic polycrystalline diamond (PCD) has found wide use as an abrasive and as a cutting element, with an annual market of $4 billion (3 billion carats in 2005).
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Written by Mike Petrashko, NSK Corporation
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Pumps and Systems, July 2009
The initial cost of a pump is a small component of the pump's total life cycle cost. Progressive, proactive maintenance practices are vital to maximize pump life, minimize downtime and avoid costly repairs and lost production.
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