×

Simplified algorithm for abnormal situation prevention in load following applications including plugged line diagnostics in a dynamic process

  • US 8,055,479 B2
  • Filed: 10/10/2007
  • Issued: 11/08/2011
  • Est. Priority Date: 10/10/2007
  • Status: Active Grant
First Claim
Patent Images

1. A system for detecting a plugged impulse line in a process measuring device, the system comprising:

  • a sensor for detecting a pressure in a process line, the sensor providing a pressure signal indicative of the pressure; and

    one or more processors implementing a first statistical process monitoring (SPM) block, a second SPM block, and a plugged line diagnostic block;

    the first SPM block configured to calculate mean values from a plurality of pressure signal sample values collected during predefined sample windows, and the second SPM block configured to calculate standard deviation values from a plurality of pressure signal sample values collected during the predefined sample windows; and

    the plugged line diagnostic block configured to mathematically model the standard deviation values as a function of corresponding calculated mean values, to predict standard deviation values based on the calculated mean values, compare predicted standard deviation values to corresponding calculated standard deviation values, and detect a plugged impulse line when a predicted standard deviation value differs from a corresponding calculated standard deviation value by more than a predefined amount.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×