pump bearing problem
pump bearing problem
(OP)
dear fellows,
I have problem with a multistage centrifugal pump known as VEB pump the problem is that from one month ago it was found that loud noise come from the rear bearing so pump was shut down and dis assembled to view what is wrong with it
there were bad deterioration in back bearing and mechanical seal damaged
we install new bearing and mechanical seal identical with its manual recommendations but the new bearing work only for 3 hours and then damaged this problem occurred 3 times and untl now i cant find where is the real problem with the pump despite the pump was install with high degree of alignment check and when stars no high vibration
i need your expert to help in this problem
I have problem with a multistage centrifugal pump known as VEB pump the problem is that from one month ago it was found that loud noise come from the rear bearing so pump was shut down and dis assembled to view what is wrong with it
there were bad deterioration in back bearing and mechanical seal damaged
we install new bearing and mechanical seal identical with its manual recommendations but the new bearing work only for 3 hours and then damaged this problem occurred 3 times and untl now i cant find where is the real problem with the pump despite the pump was install with high degree of alignment check and when stars no high vibration
i need your expert to help in this problem





RE: pump bearing problem
Is this a new or existing installation - has anything been changed in the system, pipe work added or reduced, more equipment installed or removed etc.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: pump bearing problem
RE: pump bearing problem
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: pump bearing problem
RE: pump bearing problem
RE: pump bearing problem
1- the pumping system is existing one contain 3 pumps
2- H=700 psi Q=20000 BPD RPM=3000 no. of stages =5 HZ=50
Booster pump pressure = 75 psi
3- working fluid: crude oil @ T=50 Celsius degree
RE: pump bearing problem
RE: pump bearing problem
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: pump bearing problem
the application of my pump is to charge crude oil
it has closed loop lubrication system
RE: pump bearing problem
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: pump bearing problem
Otherwise it's a pump strip down to check shaft run out, alignment, damage to any of the impellers, any blockage etc
If your process conditions changes that could cause problems, but not for three running hours before failure.
A pump bisection drawing would help...
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: pump bearing problem
Some assembly errors might also fall in same category.
Along with other requested info (drawing, description of bearing configuration), perhaps some pictures:
Would like to see the OD of outer ring and ID of inner ring.
Would like to see the axial faces.
Would like to see if possible mating surfaces on bearing housing and shaft for all the above.
Would like to see the inner and outer races of all available bearings (not just the failed one) to see if there is a sign of the loading pattern prior to damage.
The info may or may not be available. If not, I want to at least point out the value of close inspection of the damaged bearing by an experienced bearing evaluator (I'm not saying that's me...I send a lot to OEM for inspection/evaluation). You'd be surprised at what kinds of clues may be there.
Other miscellaneous shotgun questions
alignment checked ok, but is there thermal growth?
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(2B)+(2B)' ?
RE: pump bearing problem