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Online and offline vibration difference

Dear Experts, Machine tripped frequently on vibration spikes.Vibration remains 4.0 mm/s pk to 7.0 mm/s pk in online system1.Machine power 1200KW,RPM 425,coupled with reciprocating compressor. Alarm 4.7 mm/s pk Trip 7.0 mm/s pk 100 mv/g accelrometrers are installed on motor. By taking offline vibration reading it is only 1.3 mm/s pk(Online 4.0 mm/s to 7.0 mm/s pk) on same location where online sensors installed. Why offline and online vibration is too much different? This filter setting of...Read More...
Last Reply By ALI HAIDERR · First Unread Post
Hello to all, I believe some of you are in dilemma but I hope so meany of you are much more experience than I am. Making decision of changing bearing base on envelope alarms is not always the best approach but if all envelope filter are set up correctly and it is nice development of bearing fault frequency over life ob bearing what your you advice and do you have a reference to point out for correlation amplitude in envelope spectrum with level of fault in bearing. I am referring to regular...Read More...
Last Reply By Rotating Guy · First Unread Post

Vertical Motor High Vibration

Vibration_guy
Dear All , I'm Posting The vibration Details of One of my Vertical pump. The pump was running fine. But some days before we opened the Pump as we have been reported to arrest the Water Leakage. But after completing the overhauling work and mounting it on the structure high vibration observed. I have posted all related spectrum s that i have taken during Trial Run in loaded condition. However the vibration is same as No load condition. i'm Suspecting Structural/Base looseness but want to know...Read More...
Last Reply By Robert Wimberly · First Unread Post

How to eliminate EMI and RFI

Rotating Guy
We have a 6 unit of primary air fan having speed of 1780 rpm, 60 hz, with installed shinakawa CBT420 accelerometer, we are facing an frequent vibration spike which cannot captured by analyzer due to not determined when it will spike again, during investigation we found out that when using radio close to accelerometer is the vibration change rapidly and it spike. how can we eliminate this kind of problem of RFI (radio frequency interference)? regards,Read More...
Last Reply By Rotating Guy · First Unread Post