Industrial equipment users are often confronted with pump parts issues. Handling these issues requires making experience-based decisions and prioritizing. How pump hydraulic and wear components in existing inventory are treated is an issue that merits consideration.
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When a representative from a local distributor noticed a large amount of oil leaking from a semi-autogenous grinding (SAG) mill gearbox at a copper mill, he decided that a permanent solution to the maintenance issues caused by inefficient sealing methods was needed.
When designing an application, the design engineer must consider proper bearing lubrication. The lubrication method affects the proper operation of the equipment and the cost of maintaining it. Once the lubrication method is determined, selection of the proper lubricant oil viscosity is vital for prolonging the life of the equipment’s rolling element bearings.
A Kansas City motor repair shop developed a virtually foolproof process for protecting pump motors from electrical bearing damage caused by stray shaft currents. For six years, Scott Wilkins, the manager of motor shop operations, has overseen the reconditioning of hundreds of vertical motors through a process known as the vertical motor solution. None of them has had repeat bearing failure.
This article was written in response to the following question from a reader:
Could you explain how an ANSI pump impeller’s clearance setting (both an open-vane impeller with back pump-out vane and a reverse-vane impeller with balancing holes) affects pump performance? What are the advantages and disadvantages of these impeller clearances?
A thrust bearing can run hot for many reasons—such as excessive load and/or speed, inadequate oil supply or an axial clearance that is too tight. Typically, the reason a thrust bearing runs hot is because, for whatever reason, the load has increased.
Pumps and Systems, February 2007
When evaluating bearing distress, the babbitted shoe surface is commonly the only area that is examined. Although a great deal of information can be extracted from the babbitt appearance, additional information exists elsewhere.
Progressive maintenance practices are vital to maximize pump life, minimize downtime and avoid costly repairs and lost production.
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