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  1. spciesla

    Electrical motor with rotor issue

    Assuming this is an induction motor, the CBM team should be able to take high resolution spectrum data to separate the running speed (1X) peak from pole-passing frequency peaks and the 2X peak from the 2xLF (Line Frequency) peak, assuming that this is a 2 pole motor. The pole passing frequency...
  2. spciesla

    A couple of questions about rotor balancing

    Does your blower have fluid film or rolling element bearings? What kind of vibration transducers are you using to monitor and balance the unit. It is recommended to use a pair of transducers or orthogonally (90 degrees apart) mounted at each radial bearing to quantify the vibration. The...
  3. spciesla

    Help identifying the source of vibration

    I interpret "we fixed the issue by tightening the alignment bolts horizontally. Now the vibration at motor feet reduced to about 2.5 mm/s." as using the jacking bolts to restrain the horizontal motion of the motor. Jacking bolts are used to move the component (motor in this case) while it is...
  4. spciesla

    Other equipment than ADRE to monitor vibration of turbo-alternator

    ADRE is software that is used to collect vibration data from a 408 data acquisition system. Both the hardware (408) and software (ADRE) are Bently Nevada products. Typically, critical turbo-machinery has permanent vibration instrumentation (proximity probes, velocity sensors, accelerometers...
  5. spciesla

    Training Requirements for evaluating vibration monitors

    Although technology is necessary, the most important part of your vibration analysis program is the people. They need the proper training and experience (hopefully with some mentorship mixed in) to be successful. Standard vibration training (in the US, there is Vibration Institute, Mobius...
  6. spciesla

    How to determine force from wind on flags

    I appreciate the recommendations for preventing this happening again, although my solution will probably be take the flag down when it's windy. I was more interested in the engineering analysis of the situation, out of curiousity.
  7. spciesla

    How to determine force from wind on flags

    Been windy the last couple of days and I left my flag up until mother nature decided it needed to be on the ground. I have a flag bracket that was secured to a facia board with three screws. It appears that the force from the wind on the flag caused the screws to loosen/backout, which then...
  8. spciesla

    How do you know when your are ready to make a big career change

    Lots of good advice provided in this thread, specifically there's no "right decision" and it's up to you (and your family) to make the decision. As others have mentioned, the decrease in commute time could be very beneficial. Speaking about a leap into the unknown, I certainly feel like that...
  9. spciesla

    Motor's high vibrations on vertical pump unit

    Just based upon the description (vertical motor/pump, highest amplitude at the top of the motor (NDE), in one direction) suggests resonance. Recommend performing a bump test or impact test (using a modal hammer) to identify natural frequencies.
  10. spciesla

    How to deal with co-worker

    Jboggs - I haven't heard this one "There's an old engineering proverb: "There comes a time in the course of every project when its time to shoot the engineers and start production." I think you have arrived at a similar point in this issue." but I like it. LPS for you! Steve
  11. spciesla

    High 1X vibrations in all 3 axes in decoupled motor

    Could it be unbalance associated with the manner in which the unit is uncoupled? An issue with the key/coupling in the uncoupled state? That would fit the characteristics of high radial 1X vibration. The 2X vibration in the axial direction could result from an overhung unbalance condition...
  12. spciesla

    Is vibration analysis over rated ?

    There is not enough information in your post to make an assessment of the situation. "New turbine tripped on high vibrations during startup." Did it trip when attempting to transition through a critical speed, at full speed no load, after being synchronized to the grid and at X% of base load...
  13. spciesla

    looking for squirrel cage motor rotor root cause analysis expert

    Pete - A "tiny" bit of disagreement is an understatement. Maybe try Isidor "Izzy" Kerszenbaum, I know that his expertise is in generators and transformers, but he may be able to help you or direct you to someone else. http://izzytech.com/blog/staff/ 949-230-5986
  14. spciesla

    Massive fire at Notre Dame Cathedral - Paris

    Very sad news!
  15. spciesla

    Reality Check Please

    Being the only engineer and new to the company is definitely a "red-flag" to me.
  16. spciesla

    Turbine vibration

    byrdj - 1 mil is 25.4 micron, nevertheless, the specification of 34 microns seems pretty tight. I haven't heard of a 2580 MW steam turbine either. It is typical for vibration on a turbine to change with load. This can be related to thermal affects, a change in forces on the rotor (how steam...
  17. spciesla

    Generator operating frequencies.

    That sounds like a really bad day at the plant followed by two years of hell. Ouch!
  18. spciesla

    Repeated Feed Pump Bearing Failures

    Consider consulting the Operations and Maintenance Manual for the pump and/or the OEM regarding alignment offsets for thermal growth.
  19. spciesla

    I HATE Lunch Time Meetings

    At a previous place of employment, when new management came in they scheduled some meetings on Saturdays. Granted that this was a power plant which is a 24/7 operation, but the gist of it was to "set the tone" about who was in charge and what was required of the employees.
  20. spciesla

    Recommendations in books about generators

    "Operation and Maintenance of Large Turbo-Generators by Klempner and Kerszenbaum is a decent text and mixes the theoretical with the real-world. You might need to buy that one." I used to work with Izzy Kerszenbaum. He is a great guy and a very knowledgeable and respected electrical engineer...

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