Solving Gear Pump Cavi Mystery - No Priming Needed

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SUMMARY

The discussion centers on the operational anomalies of gear pumps, specifically regarding a lubricating gear pump that failed to deliver flow without priming. The user experienced a breakdown where the pump did not function despite correct rotation and temperature checks. After priming, the pump operated temporarily, but the electric motor subsequently burned out. A replacement larger gear pump worked without priming, leading to inquiries about the differences in performance and potential causes of the initial failure, including increased clearance leading to back leakage and motor overload.

PREREQUISITES
  • Understanding of gear pump mechanics and operation
  • Knowledge of lubrication systems in machinery
  • Familiarity with electric motor functions and potential failure modes
  • Basic principles of fluid dynamics related to pump performance
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  • Research gear pump design and the impact of clearance on performance
  • Study lubrication system requirements and maintenance best practices
  • Learn about electric motor specifications and common failure causes
  • Investigate fluid dynamics principles, particularly regarding suction and back leakage
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Mechanical engineers, maintenance technicians, and anyone involved in the operation and troubleshooting of gear pumps and lubrication systems.

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gear pump cavi ?

well dear all we know that gear pump is a positive desplacement pump which has constant dioscharge at different loads my problem is i need an explanation to this sitiuation

" from 1 month at my work i found a breakdown of lubricating pump used to pump oil on a bearing it was a gear pump
i found that there is no flow exiting out the pump i checked direction of rotation and pump tempreture i found nothin
a friend of mine PRIMED the pump and it has worked i found this strange because of the nature of gear pump
after 2 weeks we found that the electric motor of this pump is burned i don't know why ?
after this i changed the gear pump with a larger one which worked without any kind of priming
i don't know what's the different or the meaning of this sitiuation
pls guys help me ?
 
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strange things happen!

may be the clearance between gear and casing or between two gears, had increased causing back leakage...which might have not able to produce the initial vacuum for the suction...so might had need priming...and after priming...it could had discharged the liquid but with less efficiency due the back leakage...

and about your motor...it might had run freely...for some time...or might be overloaded...

a slight voltage fluctuation can do that...

all are possibilities as you had asked for the same..

n definitely your new pump will properly because "It is New!"

sorry...bad joke...but...there will be no casing clearance or gear clearance...
 


thanx for your answer i really appreciate this
 

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