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I tried to use vibration readings collected by portable from bearing housings of horizontal pumps to detect signs of mechanical seal failures. I had no success using the standard signal processing configurations. It's even more difficult with vertical machines. I used US in one case and it showed a much clearer indication but we do not use US that much anyways. So, I could not form an opinion with a wider variety of machines, operating parameters, vibration signal interference etc.

Regards- Ali M. Al-Shurafa

Akashri, your initial inquiry was concerning β€œmetallic seal wear” and I was thinking more along the lines of a mechanical seal.  Your pointing to content by MotorDoc (Howard Penrose) makes me think otherwise.  Were you asking about the typical seal arrangements as might be encountered on a motor?

By the way some of the content by MotorDoc where he mentions detection of seal issues can be found in an old thread at https://www.maintenance.org/to...9#399590942963646579.  Once there scroll down a bit to the content by MotorDoc.

I am very skeptical of detection of seal wear by motor current spectrum analysis. My skepticism extends to vibration analysis and other technologies, such as ultrasound, when hind-sight diagnosis is made my using other unreported tests/measurements, teardown inspection, or simple guesses. This is not intended to discredit the success of others or to discourage folks from seeking new methods, instruments and software for machine diagnostics.

Walt

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