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Plugged impulse line detection

  • US 20060206288A1
  • Filed: 02/06/2006
  • Published: 09/14/2006
  • Est. Priority Date: 03/11/2005
  • Status: Active Grant
First Claim
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1. A method to diagnose plugging of at least one impulse line carrying a process fluid therethrough;

  • said method comprising;

    receiving a digital signal from a differential pressure transmitter representative of pressure differential across at least two points of said impulse line;

    processing the signal through a filter to provide a filtered noise signal;

    calculating an absolute value of the filtered noise signal;

    arbitrating a plurality of noise threshold limit and a plurality of cross-over frequency of said absolute value of the filtered noise signal beyond said noise threshold limit to characterize plugging diagnostics of the impulse line corresponding to each of a plurality of predetermined diagnostic states pertaining to said impulse lines;

    comparing the absolute value of the filtered noise signal relative to said arbitrated noise threshold limit to obtain plugging diagnostics information; and

    discriminating among said plurality of diagnostic states as a function of said plugging diagnostic information.

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