Reducing Coupling weights in Large Motor Driven Pumps

One of the major issues in designing large motor driven pump applications is minimizing the overhung weight on the pump rotor.  Motor or gearbox drives are designed and sized independently of the driven unit.  They are based on motor frame size and/or gearbox frame sizes and the drive component manufacturer has no information on the […]

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Your pump’s Mean Time Between Repairs (MTBR) is what?…Or what should it be…

Many of the tourist spots around the world have panhandlers. Some of the more creative ones stand on street corners advertising that they will tell you where you got your shoes, for a dollar. Of course it turns out that “you got your shoes” at the corner of Bourbon and St. Peters – or wherever […]

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Shaft Fatigue Failures – Part I

Many years ago when I first started my career in a rotating equipment maintenance organization, I was spending the day with a senior metallurgist, which was part of my orientation process as a new technical employee.  He was well known to not have the best “bedside manner” and it was clear he was not thrilled […]

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Shaft Fatigue Failures – Part II

Note:  This blog is a continuation from the previous article from Becht Engineering, “Shaft Fatigue Failures – Part I”.  It is suggested that the reader review “Shaft Fatigue Failures – Part I” before proceeding with this article.  Click Here to view Part I. Before getting into the calculation methods, first a quick refresher on high […]

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Oil System Cleaning – Making Oil Flushing a Predictable Procedure

Oil system cleaning or Oil Flush has humbled many Machinery Guys. What seems like a very simple task often turns out to be to the Achilles’ heel and often unpredicted and embarrassing critical path of the machinery overhaul. The purpose of this article is to outline improvements that we have implemented to the old-fashion “Flush […]

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Pump Trips and Check Valve Closure

Pump Trips and Check Valve Closure Systems running multiple pumps in parallel can undergo serious equipment and piping damage during a pump trip caused by a power outage or pump mechanical failure. Uncontrolled reverse flow in the system can occur and if improperly selected check valves are used it can result in pumps running backwards […]

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