magnetic pump bearing damage

[s200792410]

hello
I have problem with Magdrive sealless centrifugal pump
the temperature increases rapidly and there big noise the efficiency is very low and always we dismantle the pump we find
journal bearing damaged and also the shaft sleeve damaged
bearing is made of silicon carbide
so what do you think can anyone help me

 

[desertfox]

Hi
Please read your post and look at the information you have provided, assuming you knew nothing about this problem as we here don't how would you respond.

Provide some proper information about the pump during operation and any photographs you might have and it's possible we might be able to help you.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[Artisi]

Agree completely about lack of detail, however the poster seems to non native speaker, hence the brief description -certainly photo's would assist initially.

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.)

 

[TenPenny]

Are there solids in what is being pumped? Does it tend to crystallize? Are you ever running the pump dry or deadheading it?

These are the most common problems I've seen with mag drive pumps.

You're not in Newfoundland by chance, are you?

 

[moltenmetal]

Internal silicon carbide parts failure is often associated with dry running. Insufficient flow, even for short periods, causes the ceramic parts to heat up from friction, and the next slug of liquid causes a thermal shock contraction and failure of the bushing/bearing.

 

[EdStainless]

Or, they are exceeding the coupling torque at elevated temp, the coupling slips. This produces more heat, low output (which makes the heat even worse), and intense vibration. It could be the combination of high temp, low flow, and vibrations that is causing bearing damage.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube