KSB CHTR3/10 Boire Feed Pump Locked Rotor

Poor alignment, poor seals, broken seals, poor maintenance staff.

Get good maintenance staff that can properly assess and remedy pump problems and tell you what is breaking the seals and locking the pump.

How did asking the forum to cure your High Vibration of Boiler Feed Pump work out for you? You never gave any feed back.

Nighty night. I grow weary.

thanks for your reply,

but as per suggested by that maintenance staff is poor is not the case, as mechanical seal was replaced in presence of vendor also no other part was open, so can you tell any other reason for the jamming of shaft.

I can't. The vendor can. What did (s)he say to you? After all, no-one here can see this pile of junk.

I am appalled by your lack of any reasonable action in these two cases.

You said, "as mechanical seal was replaced in presence of vendor" and then you have the gall to ask anonymous forum on the other side of the world, "so can you tell any other reason for the jamming of shaft"?

Seriously????? You had the vendor ON SITE and you are asking strangers to tell you what the problem is?

You are a fool, and no lame excuse you can offer will change that!

I hope you and Legohead have a long relationship.

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Yes, night, night... to you.

You did not replace the motor? See if shafts were bent, because you would definitely repeat the same defects.

Why not conduct double check on the pump (especially the shaft) replace the motor with on stock inventory. Then check the motor integrity both mechanical and electrical after the removal from site.

I advice replace both with new replacement on standby, if you can not do intermittent operation and I assume there is available replacement in inventory.

I BELIEVE YOUR PUMP OR MOTOR SHAFT IS BENT.

Here's your thread Last July 2015

Your previous post said you have consequent horizontal vibration.

Did you check feeding mechanism to the boiler.

Is the boiler regularly maintained?

When is the latest descaling of the boiler tubes?

Any abnormalities of the controls of water feeding, say the lag of the pump turning on or off and the opening and closing of the feed valve. Check might be some guys play the timing of control and let your pump running with out even opening the feed valve or it keeps running with close feed valve.

Who maintains your boiler? Prefer some experts on the field.

Sounds to me like you managed to screw up the spacings of the rotating portions of the pump when it was rebuilt and... expansion due to the introduction of the 100 deg feed water is causing the rotating parts to lock up. The seal may not be the cause of the binding. Investigate the rotors.

You may be driving the motor rotor out of magnetic center, which leads to all sorts of problems.

Have you 100% verified that you are turning the motor in the correct direction? This sounds like it is running (or trying to) run backwards.

This is assuming that it has been put back together correctly.

Just a thought!!

I had a similar thought, but then op said the vendor was there....

...and now a seal is broken...again.

Smoke on the water and fire in the sky too.

Like, it's just a boiler feed pump, how hard could this be to sort?