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Replacement of displacement by Vibration sensors

Saturday, September 23, 2017   By: saeed [2182] 0 Stars
For a given boiler feed water pump, we are going to replace displacement sensors, which measure the distance between the pump shaft and the body as a measure of relative vibration,with absolute vibration sensors to installed on the pump body.

Do you think it is a proper replacement?

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Wednesday, September 27, 2017   By: Ross Burns [390] 5 Stars
In general, your boiler feed water pump vibration signatures or displacements should not change by replacing the transducers with newer displacement transducers of like kind and installed as prescribed by the vibration instrument manufacturer.

As far as the displacement probes, the set gap and gap to voltage output are proportional or proximity capacitance sensors of the threaded cylindrical type, so get this right is important since wear is what we look for by using these proximity probes. The displacement vibration probes is also called a proximity device or a proximity pickup. Two items come to mind and the proximity pickup is they must be mounted on the pump casing that is not moving and the second item is interference where if they are un-shielded then they must be separated by about three-diameters to accommodate the lateral field otherwise readings are not reliable and it is showing active or unwanted displacement. But I cannot imagine you having un-shielded.

Another important concept to remember for radial vibration is keep the transducers within three inches of the bearings at x-position and y-position, and that is axially three-inches maximum as measured from the bearings.

Ross

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