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Shurafa

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Reply with quote  #1 
Equipment Admission to PdM Program

Marhaba!

I'd like to learn about your practice to include/exclude a new piece of equipment to/from your offline route based vibration program. What is your criteria to decide that?

In the plants around me, the basic filter is the horsepower. By default, any equipment < 10 HP is excluded unless a special justification is provided and approved.

Nevertheless, even these small machines can be surveyed during special events such as after overhauling. However, they are not in the regular routine data collection survey.

Regards- Ali M. Al-Shurafa
Vibe-Rater

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Reply with quote  #2 
An oil pump could be less than 10 HP and can be critical. It could be supplying a large gearbox or bearings with life saving oil. A failure of those due to small oil pump failure could cost a lot of downtime. Criticality ratings are required. Asking around the engineers or operators on site will quickly tell you which machines they can't do without. rgds
Ron Stiemsma

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Reply with quote  #3 
For the most part it is how critical it is to whatever system it is in.  Other considerations are:  Does it have a backup and is it accessible?  We do have a horsepower limit as well,  > 50 HP for us.  Most of our stuff is very large.  But we do have some 1/4 HP stuff that is critical that we do look at.  The HP size is based on the money we will spend monitoring compared to the cost to replace.  I also have a general machine setup that we can use on machines to help troubleshoot an issue.
RGf

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Reply with quote  #4 
Criticality is the key as size (HP) is  just an ancillary consideration. Even with non-critical small HP equipment or machines classified as run to failure I like to either do a vibe route or an acoustic monitoring survey 1/year so I can get a feel on how the machines are running. Of course this is greatly dependent on work load and the time to analyze the data. At my present location I have the luxury of having installed acels and desk top monitoring capability on most of my equipment so I have the time to look at the other stuff.   
Shoveldr

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Reply with quote  #5 
I did some work at a power plant that had a small oil transfer pump that never ran, its purpose was to provide fuel oil to the boilers if there was an issue with coal crushers.  It was left out of the PdM program because it was small and never ran.  Then they got a batch of wet coal and tripped off all their crushers, the pump started automatically and it was so noisy the operator immediately turned the backup on and turned off that pump.  The backup was worst, so he switched back to the main pump and by the time they got coal back it was almost destroyed.  So understanding what is truly critical is important.

The other important thing is understanding how the assets fail.

Ideally you would want to add assets where a Failure Modes and Effects Analysis (FMEA) showed vibration would detect/prevent specific faults, but that is neither a cheap or quick process.  Knowing how the assets fail and how that failure affects the plant output is key to determining a monitoring strategy. 

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