Vibration velocity limits?
Vibration velocity limits?
(OP)
What are the standard alarm / trip levels of vibration velocity for 2 pole generators as per different standards (MIL, ISO, API etc.)? In one 2 pole generator, after balancing by one of the leading vibration analysts, the final vibration velocity on vertical direction was about 22 mm/sec (0.75 in/sec) and he says it is okay as per standards. Any comments ?





RE: Vibration velocity limits?
RE: Vibration velocity limits?
Patrick
RE: Vibration velocity limits?
RE: Vibration velocity limits?
Patrick
RE: Vibration velocity limits?
I was wondering about your unit conversion.
22 mmsec.
Would be 22/25.4 = 0.866 ips IF both numbers expressed in peak/0.
My understanding is the international folks use velocity in mm/sec RMS units and US uses velocity ips in PK/0 units, which means the ips number would be even 1.41 times higher
22mm/sec rms => 1.22 ips pk/0.
If that is really what you have I don't see how anybody can look at you with a straight face and tell you it's ok. Compare it to the new motor (rigid base) NEMA standard above and you see a factor of 10 difference!
RE: Vibration velocity limits?
Thanks for the correction about the unit conversion. The velocity I mentioned was peak.
I have posted this query in reliability forum and got some good suggestions about relevant standards.
Thanks
RE: Vibration velocity limits?