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Shoveldr

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Posts: 88
Reply with quote  #1 

I have a customer that is updating his vibration monitoring system (very outdated).  On a couple of pump bearings they have shaft riders that are no longer functioning and we are looking at an "easy" replacement.  This would be done on an outage for control system work, they are not doing a major outage on the equipment.

The though is to replace the shaft riders with a reverse mount proximity probe, the issue is the port they are using for the shaft rider is a 1-UNC where all the probe holders I've found are 3/4-24 and I haven't had any luck finding a sleeve adapter that would work.

Has any one run into a similar situation and found a practical solution?

Walt Strong

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Posts: 889
Reply with quote  #2 
Can you use a conventional pipe bushing to get from 1" down to 3/4" or 1/2" and then use one of these adapters?

https://www.stiweb.com/Proximity_Probe_NPT_Adapter_p/cmcp4190.htm

Walt
John from PA

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Posts: 963
Reply with quote  #3 
Quote:
Originally Posted by Walt Strong
Can you use a conventional pipe bushing to get from 1" down to 3/4" or 1/2" and then use one of these adapters?

https://www.stiweb.com/Proximity_Probe_NPT_Adapter_p/cmcp4190.htm

Walt


Walt is on to something with the use of pipe fittings.  Look carefully on the pump and near each bearing for two pipe plugs that are 90°.  Very often such provisions are used for the test stand when tested at the OEM.  In a pinch, I have seen pipe plugs drilled and tapped for the probe, usually a 3/8-24 thread.  I would further suggest you try this first, on one location, and see what you get.  There are many pumps out there that have had bearing journals, and the adjacent proximity probe target area, repaired with chrome plating.  If chrome plating exists in the probe target area, for all essential purposes the probe will be useless.  
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