Where and how do I test for motor vibration in maintenance?

[haru87]

Hi everyone, this i my first post here. I need some help in doing a general work instruction for motor vibration analysis. I am totally new in this maintenance sector. I could do with some help :)

Basically i need to know which exact points i have to test for vibration and method to be use. Dont need to be too detailed, crucial thing is where and which position. I search the web and they don't really mention much on how to do a simple test.

I thank you guys in advance for the information you provide.

 

[Ranger Mike]

what kind of motor?
what is application?

 

[brewnog]

What sort of motor? What application?

What are you testing for vibration for?

 

[haru87]

It can be any electric motor coupled to a centrifugal pump.

It is mainly a weekly maintenance thing. To check the vibration reading to ensure it is running in good condition.
If vibration reading exceeds 0~0.10mm/s rectification will be done as a part of preventive maintenance.

Its application is commonly found at petrolchem plant. running at above 70degrees c.

I hope i answer and give enough details for you guys to help me ._.

 

[brewnog]

Well, if you've already got a criteria to indicate maintenance is required, use that.

I'd look at axial vibration on both the motor and pump and the relative phase thereof; this will indicate whether you have an issue with angular misalignment between the two machines. I'd also look at vertical and transverse measurements to indicate any rotating imbalance. You might also want to do some spectral analysis (compare to a baseline regularly) to diagnose any bearing problems.