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  1. sms

    Understanding Resonance

    Resonance occurs when a forcing function frequency is equal to a natural frequency. A simple example of excitation of a natural frequency is plucking a guitar string. The string vibrates at its natural frequency and because of damping the vibration reduces in amplitude over time. An example...
  2. sms

    illinois license...expired stamping

    Yes and Yes...report it immediatly. "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball, "Kelly's Heros" 1970 Please see FAQ731-376 for tips on how to make the best use of...
  3. sms

    Dealing with "Overachiever Stress"

    Ask lots of questions of those who have "it" stored in their heads. Many of us old guys like it when the whipper snappers figure out that they don't know it all, and start asking questions. Use reading eng-tips as a relaxation tool... Read trade journals and other papers or what not as well...
  4. sms

    how to resolve cavitation problem

    As has been said, increase NPSHa... "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball, "Kelly's Heros" 1970 Please see FAQ731-376 for tips on how to make the best use of...
  5. sms

    How many times have you changed Jobs?

    First company: 2 very different jobs in 5 years. Second company: 2 fairly different jobs in 9 years. Third Company: Same job for 7 years. Fourth Company (hopefully last): same job for the last 3 years. "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it...
  6. sms

    First job not so great

    It would help to know where you are and what kind of piping you are working on (natural gas pipline? Refinery piping? Steam piping in power plants?). Also, are you at an engineering contractor or a operating company? I would suggest that one approach is to get out of the piping design business...
  7. sms

    weak link between gearbox and PM generator

    Here is what happens when it doesn't work.... http://www.liveleak.com/view?i=cdd_1203701257 "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball, "Kelly's Heros" 1970...
  8. sms

    high 2rd harmonic frequency

    It is a hard flange coupling, not a clutch. "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball, "Kelly's Heros" 1970 Please see FAQ731-376 for tips on how to make the...
  9. sms

    high 2rd harmonic frequency

    Ok, this generator is built like its bigger cousins... I assume that orbit is off shaft probes... If the 2x suddenly showed up on synchronization would say that this is related to the generator rotor. That 2X in the probe trace is too symetric to be due to preload or misalignment and looks...
  10. sms

    VRU-Liquid Ring Compressors

    If it is any consolation I have had a hell of a time with screw compressors in VRU service as well... Cracked silencers, blown seals, other nasty problems. And then there are the standard recip compressor issues in VRU service, failed valves, rings and riders... So maybe a liquid ring is no...
  11. sms

    VRU-Liquid Ring Compressors

    We are beginning to look at using them for VRU, but I can't say I like the idea.. One of my main concerns is that my experience has been that they don't much like entrained solids. I am concerned that if you have gunk in the gas stream, which you always do on VRU, then you may wreck the machine...
  12. sms

    Failure of rotor for centifugal blower

    What leads you to believe it is bore stress? Were the interference fit done improperly? Was the blower subjected to an operating condition it was not designed for? Over speed? My experience with this sort of impeller failure is that it is much more often a funtion of impeller resonance...
  13. sms

    high 2rd harmonic frequency

    Based on the 2X bode plot it looks like a structural resonance frequency excited by 2X running speed. I assume that you do not have proximity probe data... Would be nice to see what the shaft is actually doing. Since there have been repairs made, I would suggest looking for soft foot in the...
  14. sms

    Business Travel

    Anything over 6 hours is business class, no questions asked. "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball, "Kelly's Heros" 1970 Please see FAQ731-376 for tips on...
  15. sms

    The SPY

    Dave this is the VP of HR, You are fired for firing someone on a public forum on the interenet. "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball, "Kelly's Heros" 1970...
  16. sms

    FE Help... please?

    I taught for Testmasters for a while. I taught for fun, and extra money to buy guitar gear. I stopped because I just did not have the extra time in my schedule anymore. I think their program is pretty good, and at least when I taught for them if you didn't pass you could retake the course for...
  17. sms

    Expired License

    Me too, I sign my name Steven M. Schultheis, PE (Texas) so there is no confusion as to where I am registered. "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball...
  18. sms

    Acceptable oil temperature for journal bearing lubrication

    BTW GE Bently publishes lots of stuff on condition monitoring right on their web site.... http://www.ge-energy.com/prod_serv/products/oc/en/orbitmagazine.htm "Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something...
  19. sms

    Acceptable oil temperature for journal bearing lubrication

    1) Vibration and bearing metal temp alarm and shutdown recommendations are in the GE operations manual. BTW maybe you posted a different thread, but your OP here mentions nothing about vibration. A conservative recommendation for vibration is to shut down at 50% bearing clearance (to avoid...
  20. sms

    Is it worth it to get PHD in Mechanical Engineering

    No you're fine, Greg and I are long time participants here and the management likes us to put that FAQ message in our signature lines. No way will GE or other turbomachinery manufacturers hire a PhD and put him in a field service job. If you want to do field service, do it now with a BSME...

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