Simplified algorithm for abnormal situation prevention in load following applications including plugged line diagnostics in a dynamic process
First Claim
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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 model the standard deviation values as a function of corresponding mean values, to predict standard deviation values based on 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.
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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.
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Citations
22 Claims
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1. A system for detecting a plugged impulse line in a process measuring device, the system comprising:
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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 model the standard deviation values as a function of corresponding mean values, to predict standard deviation values based on 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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of detecting a plugged impulse line in a process measuring device, the method comprising:
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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. - View Dependent Claims (19, 20, 21, 22)
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Specification