pm

[mickeyrench]

does anyone think doing pm on motors every month, check, tighten nuts and bolts, take temp. and vibfation readings is too much? Should it be every 2 or 3 months?

We do amp ,and voltage, and megging quarterly. We have a good 100 motors from 1-200hp . This seems resonable.

 

[Mule]

does anyone think doing pm on motors every month, check, tighten nuts and bolts, take temp. and vibfation readings is too much? Should it be every 2 or 3 months?

We do amp ,and voltage, and megging quarterly. We have a good 100 motors from 1-200hp . This seems resonable.

There are books that have recomended frequencies depending on RPM and HP. See NETA..Or NFPA PM maintenance (help me guys on this number). However your PM program should include the cost of the reliability impact for each motor. Motors under 200hp are hard to justify PM's , but the cost of the downtime is likely much greater and brings justificiation clearly back into the picture. Ive seen management "run to fail" 200hp mtrs, and Ive seen them check critical motors daily...so go figure. Whats important is trending the vibration readings and insulation PI, and being trained well enough to make predictions based upon that info.

 

[iwire]

Or NFPA PM maintenance (help me guys on this number).

http://www.nfpa.org/catalog/product...Maintenance&pid=70B06&src=nfpa&order_src=A292

 

[zog]

does anyone think doing pm on motors every month, check, tighten nuts and bolts, take temp. and vibfation readings is too much? Should it be every 2 or 3 months?

We do amp ,and voltage, and megging quarterly. We have a good 100 motors from 1-200hp . This seems resonable.

Depends on environment and criticality.
http://www.netaworld.org/Category.cfm?CategoryID=27

 

[billsnuff]

Depends on environment and criticality

I would start with a risk anaylsis (criticality). There are times when it is acceptable to run to failure.

here's a link to a brief article on failure anaylsis

http://www.plantservices.com/articles/2007/073.html