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Anonymous Poster

Bearing Abnormal Temperaure

10/26/2010 4:17 AM

reasons for boiler feed water pump motor front end bearing abnormal temperature

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#1

Re: Bearing abnormal temperaure

10/26/2010 5:06 AM

replace the bearing , worn out

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#2

Re: Bearing abnormal temperaure

10/26/2010 5:37 AM

Many reasons for abnormal temperature, below are the most common;

1. Lubrication, oil (or lack there of) if it is oil lubricated.

2. Lubrication, Grease-too little

3- Lubrication, Grease-too much (this leads to #2 as excessive grease causes the grease to melt out)

4- Excessive Load, C-Face motor/pump application, in some cases the pump bearings are wore to the point that the motor is acting as a pump shaft bearing.

5- Excessive Load, belt driven applications due to belt tension.

6- Worn out as the previous post had suggested. When you replace the bearing (as you should before major failure occurs), do this carefully to closely inspect the old bearing and associated components. The condition of the rollers and races will paint a clear picture in most cases.

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#3

Re: Bearing abnormal temperaure

10/26/2010 7:16 AM

UsmanS, Is this you? Is this the same steam plant?

http://cr4.globalspec.com/thread/61525#comment644614, if so, it's likely that this situation, that is now fixed, caused damage to the bearings. They need to be replaced.

I think it would be money well spent to find a qualified technician and hire that person to:

A) Get your plant set up properly.

B) Stay long enough to train your personnel to both run the plant and troubleshoot any problems that arise in the future.

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#4

Re: Bearing Abnormal Temperaure

10/27/2010 2:05 AM

Hi, I am in line with Tim In Mexico. All the points he said must be noted and these are well works with antifriction bearing. I am giving some other inputs regarding bush type split journal bearing which are generally used in high capacity & high speed multistage boiler feed pump as we have in our plant-

1) Excessive bearing clearances can cause it and remidy is to replace it.

2) Bearing clearances less than working values and you have to made it proper. Be careful during the bedding of shaft on bearing. Improper bedding can cause high temp.

3)Any scoring on brg. bottom half or low clearance on crown- polishing required to exact clearance value.

4)Check motor & pump alignment to your standard keeping it in mind that motor must be a bit lower than pump shaft to facilitate it's float to magnetic center during operation otherwise crown clearance will suffer causing abnormal heating of brg. and subsequent damage.

5)Lubrication is one most important criteria. Lack of lubrication, contamination in lub oil, restriction in ring rotation in case of ring lubrication is also causes high temp. and damage. Generally BFP brg. are water cooled. Service cooling system and be sure that cooling system is absolutely healthy. Its all about ring lubricated split journal brgs.

6)BFP gland leak is another frequent occurence which I have experienced many time that it has it's contribution to shooting up brg temp. In that case attend the gland leakage immidiately. Also the gland quenching system has it's roll. Be sure that supply of gland quenching water supply is uninterrupted otherwise heat of feed water will flow to the bearings causing high tempareture.

Hope it will help you. Get your pumps healthy.

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#7
In reply to #4

Re: Bearing Abnormal Temperaure

10/27/2010 7:35 AM

GA

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#5

Re: Bearing Abnormal Temperaure

10/27/2010 2:27 AM

How much is the temp, More info is required to do proper diagnosis, load, amp, kind of lubrication, vibration level, is it noisy?

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#6

Re: Bearing Abnormal Temperaure

10/27/2010 5:57 AM

If you go through below important vibration analysis plots during transient and startup it will be better to diagnose and found the exact problem.

1- Spectrum

2- Waterfall

3- Orbit

4- Shaft Center line

5- Cascade

6- Process data suction, discharge and flow design and actual.

7- Current bearing temperatures reading at DE and NDE.

8- Motor current

9- Lube oil analysis result to know the condition of oil.

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#8

Re: Bearing Abnormal Temperaure

10/30/2010 6:48 AM

Not enough information you have provided. Question is very general one not even indicating type of bearing or type and size of pump.

Answers to your question you can get at any trouble shouting chart for bearing or pump. You may get it in manufacture's manual also. By such questions efforts of learned respondants for replying your question is wasted. Also there is no response from the Guest who is un-identifiable.

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Anonymous Poster
#9

Re: Bearing Abnormal Temperaure

02/12/2011 3:01 AM

seals are tight

un balanced load

poor lubricaton

check bearing type and arrangement

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Users who posted comments:

Anonymous Poster (1); Fahad (1); kramarat (1); pritam (1); Suranjan Chattopadhyay (1); Tim in Mexico (2); timelord (1); VCM INSPECTOR (1)

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