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Shurafa

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Reply with quote  #1 
Phase Angle of 2X, 3X, 4X ...

How frequently do you analyze phase angle of components other than 1X?

Regards- Ali M. Al-Shurafa
OLi

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Reply with quote  #2 
Phase of 2xRPM are important on major machines like turbines as phase shift at steady state can if the machine is stable detect and warn you for a shaft crack and failure, otherwise I don't use them.
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MarkL

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Reply with quote  #3 
I only do Phase if I'm doing 'One off' trouble shooting type stuff, or in rare case I have a 'funny' 1x that I can't differentiate between unbalance and misalignment. Otherwise I seldom use it.
It's too time consuming as a regular route tool. IMO
Vibe-Rater

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Reply with quote  #4 
I don't know precisely why but on GT set we look at 1x and 2x phase, nothing further up.  But comments from turbine gen set full on people might shed better light. rgds
John from PA

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Reply with quote  #5 
Quote:
Originally Posted by Vibe-Rater
I don't know precisely why but on GT set we look at 1x and 2x phase, nothing further up.  But comments from turbine gen set full on people might shed better light. rgds


1X and 2X phase, as OLI has mentioned, can be a useful tool for shaft crack diagnostics.  For details, use the link at https://www.gemeasurement.com/sites/gemc.dev/files/orbit_v31n3_2011_q3.pdf and load the October 2011 issue of the BN/GE Orbit magazine.  Specifically go to page 55 for the article titled The Importance of Filtered Vibration Data.  Page 56 shows an acceptance region plot where "normal" machine behavior can be defined in an acceptable region.  If the machine passes outside the defined region, then appropriate alerts can be configured.

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