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Water Ingression in Lube Oil

02/04/2017 9:28 AM

In recent shut down, it was revealed the journal bearings babbit surfaces of Turbine are more darker. Oil analysis indicated that there is water ingression in lube Oil. What can be possible points of water leakage ?

Oil Coolers ?

Gland Seals ?

Except that what other points can be ?

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#1

Re: Water Ingression in Lube Oil

02/04/2017 11:55 AM

You should have asked for those books and learned about maintenance before you took this job.

It's too late to ask an anonymous forum to save your bacon now.

Look for the ingression point and repair it.

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#2
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Re: Water Ingression in Lube Oil

02/04/2017 12:43 PM

I recommeded them to use Online lube oil cleaner centrifuge in service periodically. Our operations person were using it during shut down. There is also recommendation of taking online lube oil centrifuge periodically during running phase. But I am more concerned about water ingression. Just asked from people who has spent their lives with work

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#3
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Re: Water Ingression in Lube Oil

02/04/2017 4:13 PM

I get the impression that you are being paid to give "expert" advice to a client with contaminated oil.

I'd be looking for documentary advice, not advice from anonymous people who may be well intentioned but cannot see the equipment.

If it were me, I'd get some knowledgeable advice from the equipmentmanufactruer's tech service people.(And pay them)

Eliminating Moisture Damage to Bearings on Critical Steam Turbines ...

water ingress into turbine oil - Topic

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#4

Re: Water Ingression in Lube Oil

02/04/2017 6:37 PM

Lots of ways water might be in lube oil.

Water might have been in the oil when it was added to the system.

Seals and coolers as you mentioned.

Anytime the lube oil system is open humidity can be a souce of water ingress.

Interestingly, centrifugal oil purifiers, like you mention can easily be a source of water in lube oil if it is operated incorrectly.

Improper washing or steam jetting can add water.

Improper design or use of settling tanks could be another problem area.

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#5

Re: Water Ingression in Lube Oil

02/04/2017 10:31 PM

Its condensation!

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#6

Re: Water Ingression in Lube Oil

02/05/2017 12:00 AM

I seem to remember a similar question around 7 years back. The OP was really good in keeping the thread up to date.

Turned out the maintenance staff had used a cheaper desicant in the breathers AND/OR had not been maintaining or reconditioning the desicant.

Ended up to be condensation as a result of alternate breather desicant.

As others have indicated, lots of possibilities. If you have centrifuge residue, then spectro analysis might give some hints as to the source. (Look for items that are not materials in the expected wear components.)

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#7

Re: Water Ingression in Lube Oil

02/05/2017 4:54 AM

http://turbolab.tamu.edu/proc/turboproc/T24/T24147-165.pdf

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#8
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Re: Water Ingression in Lube Oil

02/05/2017 12:01 PM

Document is not opening

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Re: Water Ingression in Lube Oil

02/05/2017 1:25 PM
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#10

Re: Water Ingression in Lube Oil

02/06/2017 11:13 AM

Any chance this is a steam turbine or a gas turbine?

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#11

Re: Water Ingression in Lube Oil

02/06/2017 12:38 PM

I think you are on the right track. Obviously, if the oil is being kept cooler than saturation temperature of any steam leakage at glands and seals, there will be an issue with water entrainment.

Shockingly, Lyn is right when he states (obliquely) that you need to take a look at operational data for the time period in question, and build up a temperature chart/history for the lube oil reservoir. Other factors could be %RH, dew point vs. ambient temperature, etc. near the machine.

If you do not have time for all that, then clearly, you need to sit down with operations staff (leadership) and determine what their key operating parameters are relative to the oil cooler, oil reservoir, gland seal pressure, temperature, etc. If they do not know, then you have essentially isolated the source of the problem. Operator error.

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