Dear Khun Krit K.,
Comment a little bit of your revised at last work procedure as below.
1. Checking and fixing the soft foot procedure by feeler gauge is accuracy enough, no need the re-work process checking with 6.1, but how ever, I would like to recommend to use the plastic gauge which, it is higher accurate and saving the working time than feeler gauge.
2. Checking and fixing procedure as the step 6, is correct as theory of soft foot checking for the horizontal four motor legs. But I afraid that is not accurate enough for the 16 mounting bolts flange mounted motor because even though we loose only one bolt, while as the beside left and right loosen bolt is tighten, thus, the defection gap is not real.
I would like to have minor correction as the attached r1 file for feeler gauge which is easy to perform and r2 file for plastic gauge which higher accuracy than r1, but the motor lifting process to insert the plastic gauge is doubt.
How ever, speaking from my experience, I still be doubt that is the soft foot only one the root cause of this vibration high ?. If it is correct, the vibration should to be high and steady level of the vibration value along the working time, not be changed in the vibration value as much as this case. I afraid that is not only soft foot effect, but thermal is one of the root cause too. The thermal growth which occurred around the motor housing is not the same, it will effect the the motor barrel casing expanding in different value and then the motor casing is bent along the axis.
In order to prove this case, I would like to recommend to use take Tomography Inspection in measuring the thermal growth in the motor barrel casing. It may be useful for Siemens in the next installation like this.
Best Regards,
Sommai T.
Dear Khun Krit K.,Comment a little bit of your revised at last work procedure as below.1. Checking and fixing the soft foot procedure by feeler gauge is accuracy enough, no need the re-work process checking with 6.1, but how ever, I would like to recommend to use the plastic gauge which, it is higher accurate and saving the working time than feeler gauge. 2. Checking and fixing procedure as the step 6, is correct as theory of soft foot checking for the horizontal four motor legs. But I afraid that is not accurate enough for the 16 mounting bolts flange mounted motor because even though we loose only one bolt, while as the beside left and right loosen bolt is tighten, thus, the defection gap is not real. I would like to have minor correction as the attached r1 file for feeler gauge which is easy to perform and r2 file for plastic gauge which higher accuracy than r1, but the motor lifting process to insert the plastic gauge is doubt.How ever, speaking from my experience, I still be doubt that is the soft foot only one the root cause of this vibration high ?. If it is correct, the vibration should to be high and steady level of the vibration value along the working time, not be changed in the vibration value as much as this case. I afraid that is not only soft foot effect, but thermal is one of the root cause too. The thermal growth which occurred around the motor housing is not the same, it will effect the the motor barrel casing expanding in different value and then the motor casing is bent along the axis.In order to prove this case, I would like to recommend to use take Tomography Inspection in measuring the thermal growth in the motor barrel casing. It may be useful for Siemens in the next installation like this.Best Regards,Sommai T.
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