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Anonymous Poster

Failure of Thrust pads in TG

11/30/2009 1:13 PM

Dear All, Kindly let me know complete details about effect of Magnetic Center shift in Alternator on Thrust bearings. Will magnetic center alignment offset, cause instant damage of Thrust pads. If any case studies on the subject are available on net? Failure of Thrust Pads is noticed when a 162 MW set is loaded upto 10MW. This has happened two times. On opening both Turbine and Alternator, it is observed to be having an offset of Alternator Magnetic Center by +2mm and failure of one of the HP Stage retaining rings. What may be the culprit for the above failure? Urgent solution is requested.
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mayt2u
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Join Date: Aug 2007
Location: N.E. Alberta 55.6329 N Lat. 111.0729 W Long. Canada
Posts: 216
Good Answers: 7
#1

Re: Failure of Thrust pads in TG

12/01/2009 5:39 AM

Kind of weird you would have trust issues with the alternator, they are usually magnetically balanced. (even poles, windings etc) I can think of a few things for the turbine; first critical, miss alignment, holding bearing wrong location, lack of lubrication. Send a drawing of the layout and maybe someone can point out the fault. Bearing locations, lube system, speed, temp etc.

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