Simplified algorithm for abnormal situation prevention in load following applications including plugged line diagnostics in a dynamic process
AssigneeFisher-Rosemount Systems, Inc.
InventorJohn P. Miller
Life of this patent
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Abstract
Systems and methods are provided for detecting abnormal conditions and preventing abnormal situations from occurring in controlled processes. Statistical signatures of a monitored variable are modeled as a function of the statistical signatures of a load variable. The statistical signatures of the monitored variable may be modeled according to an extensible regression model or a simplified load following algorithm. The systems and methods may be advantageously applied to detect plugged impulse lines in a differential pressure flow measuring device.
Claims5
A method of detecting a plugged impulse line in a process measuring device, the method comprising:
- detecting a pressure in a process flow line, and generating a pressure signal indicative of the pressure;
- calculating mean values of sampled values of the pressure signal collected over predefined sample windows;
- calculating standard deviation values of sampled values of the pressure signal collected over the predefined sample windows;
- creating a model of standard deviation values of the pressure signal as a function of mean values of the pressure signal;
- predicting standard deviation values of the pressure signal based on mean values of the pressure signal and the model;
- comparing predicted standard deviation values of the pressure signal to calculated standard deviation values of the pressure signal;
- and
- detecting a plugged impulse line when a predicted standard deviation value of the pressure signal differs from a corresponding calculated value of the standard deviation of the pressure signal by more than a predefined amount.
Dependencies are inferred from the claim text.