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Hi guys, We are having an issue with a centrifugal pump which needs your advice. The motor has an abnormal sound, the vibration of both motor and pump are fluctuating from 4.6 to 5.7 mm/; the dominant vibration frequency is 100 Hz and the strange frequency range of 2800 to 3500 Hz appears. The brief information of equipment as follows: In May 2016, the vibration increased at both the motor and pump from 3 mm/s to around 6 mm/s and fluctuated from 5.3 to 6 mm/s, the dominant frequency at 100...Read More...
Last Reply By Vastocean · First Unread Post

An unknown frequency observed at Gearbox

Hi, This is equipment of Steel Industry from Bar Rod Mill unit. Equipment is Mill Stand, Which is having reducer gear. The Input shaft have 24teeth and mating gear has 63teeth. Intermediate having 19,66 teeth and output shaft having 31,31teeth. I didnt have any problem with vibration whenever the higher dia bar is rolled vibration will be 4.0mm/sec peak and during lesser dia bar rolled it will 2.5mm/sec peak. The spectrum is showing a high amplitude dominant peak of 73.1orders of input speed...Read More...
Last Reply By Beatnik · First Unread Post
We have 5 identical pumps running side by side all at the same speed, and I know what you're going to say... "Their vibration frequencies are modulating each other!" Unfortunately I don't think that's case (but I could still be wrong). We've only noticed on one of the motors that there is this relatively long beat frequency. See attached. Bearing faults aren't lining up, rotor bar and stator slot frequencies aren't lining up either. The motor is a 400HP, GE L5011VP, 460Volts, 1180 RPM. It is...Read More...
Last Reply By Walt Strong · First Unread Post

Oil Vapour Extraction Fan - High Vibration

Dear Friends, I need your suggestion regarding oil vapor extraction fan. Motor speed 2900 R.P.M, we are frequently facing high vibration in the fan. Spectrum indicates unbalance 1X. High radial & axial vibration. Especially after P.M The vibration was very high.in P.M we are replacing the filters only. Sometime new Fan itself high vibration .Yearly 3 times we are replacing new fan drum,Due to high vibration. It’s very expensive. What necessary action or modification required in this fan.Read More...
Last Reply By Walt Strong · First Unread Post