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Fan Motor Starting Vibration

Dear all Equipment Centerhung Fan Problem :starting Vibration at motor and fan upon start lasts for 1or two seconds reaches 8 mm./sec sometimes and it doesnt give same behaviour at every start runs between (4 and 8 mm./sec) then after than it damps again to 2 mm./sec the vibration occurs only at start for few seconds and then vanishes. Motor :induction motor 3 MW with LRS (liquid resistance starter). Tests performed : Cascade plot before and during the start to capture the frequency of the...Read More...
Last Reply By John from PA · First Unread Post
Dear All, I found some gap (19 mils = 0.49 mm) on one foot of Steam Condensing Turbine. the reading was taken in cold condition, the question are: how much is permissible for this kind of gap? this gap is for bad installation (soft foot) or gap for thermal expansion? what is the cause of this kind of gap? I appreciate your comments. Best Regards.Read More...
Last Reply By Walt Strong · First Unread Post

Noise electric motor

we have a big noise in the electrical motor which it drives the lube oil pump. 45 KW, 400 V - 50Hz The hydraulic motor pump Running speed Motor: 1480 CPM Bearing roller type: DE & NDE: 6314 /C3 unfortunately we are facing a problem in our software, in fact we use the screenshot from analyser Oneprod MVP2-2C to analyse the noise come from the motor. BPFO = 3.08 BPFI = 4.92 FTF = 0.38 2BSF = 2.05 Find attached the spectrums details. i suspect that BPFO was defect, but it is modulated by...Read More...
Last Reply By Walt Strong · First Unread Post

Noise in vertical electrical motor

we have a big noise in the electrical motor which it drives the lube oil pump. 95 KW, 400 V - 50Hz Running speed : 2980 CPM Bearing roller type: DE & NDE: 6314 /C3 unfortunately we are facing a problem in our software, in fact, we use the screenshot from analyser Oneprod MVP2-2C to analyse the noise. BPFO = 3.08 BPFI = 4.92 FTF = 0.38 2BSF = 2.05 1. As showning in the attached spectrum, there is a high peak at 281 Hz. 2. the carrier frequency at 413 Hz modulated by running speed doesn't...Read More...
Last Reply By ai.engineer · First Unread Post