METHOD AND SYSTEM FOR DETECTING ABNORMAL OPERATION IN A STIRRED VESSEL
First Claim
1. A method for detecting an abnormal situation associated with a stirred vessel in a process plant, the method comprising:
- collecting first data associated with pressure within a stirred vessel;
filtering the collected first data to isolate a frequency component corresponding to changes in pressure associated with blade rotation in the vessel;
generating statistical data from the filtered first data;
analyzing the statistical data to detect whether one or more abnormal situations associated with an agitator of the stirred vessel exist; and
generating an indicator of an abnormal situation if one or more of the one or more abnormal situations are detected.
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Abstract
A system and method for detecting abnormal situations associated with a stirred vessel in a process plant receives statistical data associated with a pressure within a stirred vessel. A pressure signal associated with the pressure in the vessel is filtered by a digital filter to isolate a frequency component corresponding to pressure changes caused by the movement of a blade of an agitator through a fluid. For example, a pressure sensor device disposed at least partially within the stirred vessel may generate the statistical data based on a pressure signal. The statistical data is analyzed to detect whether one or more abnormal situations associated with an agitator of the stirred vessel exist. For example, the statistical data may be analyzed to detect whether the agitator is broken/unbalanced, corroded, missing a blade or multiple blades, etc. If an abnormal situation is detected, an indicator of the abnormal situation may be generated.
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Citations
25 Claims
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1. A method for detecting an abnormal situation associated with a stirred vessel in a process plant, the method comprising:
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collecting first data associated with pressure within a stirred vessel; filtering the collected first data to isolate a frequency component corresponding to changes in pressure associated with blade rotation in the vessel; generating statistical data from the filtered first data; analyzing the statistical data to detect whether one or more abnormal situations associated with an agitator of the stirred vessel exist; and generating an indicator of an abnormal situation if one or more of the one or more abnormal situations are detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detecting an abnormal situation associated with a stirred vessel in a process plant, the method comprising:
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collecting first data associated with pressure within a stirred vessel filtering the collected first data to isolate a frequency component corresponding to changes in pressure associated with blade rotation in the vessel; generating first statistical data from the filtered first data; generating second statistical data from the collected first data; and analyzing the first statistical data and the second statistical data to detect whether one or more abnormal situations associated with an agitator of the stirred vessel exist; and generating an indicator of an abnormal situation if one or more of the one or more abnormal situations are detected. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A system for detecting an abnormal situation associated with a stirred vessel in a process plant, the system comprising:
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a digital bandpass filter tuned to a frequency component corresponding to a rate at which spikes occurs in a pressure signal generated by a pressure sensor disposed at least partially within a stirred vessel; a statistical parameter generator to generate one or more first statistical parameters based on a filtered pressure signal; and an abnormal situation detector to detect at least one abnormal situation associated with an agitator of the stirred vessel based on the one or more first statistical parameters, and to generate one or more indicators of one or more abnormal situations situation are detected. - View Dependent Claims (18, 19, 20, 21)
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22. A pressure transmitter for detecting an abnormal situation associated with a stirred vessel in a process plant, the pressure transmitter comprising:
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a processor; a memory; a routine stored in the memory and adapted to be executed by the processor to receive data associated with a pressure signal generated by a pressure sensor disposed at least partially within a stirred vessel; a routine stored in the memory and adapted to be executed by the processor to filter the received data to isolate a frequency component corresponding to a rate at which spikes occur in the pressure signal; a routine stored in the memory and adapted to be executed by the processor to generate statistical data from the filtered data, wherein the statistical data comprises an indication of a standard deviation of the pressure signal at the frequency component; and a routine stored in the memory and adapted to be executed by the processor to analyze the statistical data to detect whether one or more abnormal situations associated with an agitator of the stirred vessel exist based on changes in the standard deviation of the pressure signal at the frequency component. - View Dependent Claims (23)
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24. A pressure transmitter for detecting an abnormal situation associated with a stirred vessel in a process plant, the pressure transmitter comprising:
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a processor; a memory; a routine stored in the memory and adapted to be executed by the processor to receive data associated with a pressure signal generated by a pressure sensor disposed at least partially within a stirred vessel; a routine stored in the memory and adapted to be executed by the processor to filter the received data to isolate a frequency component corresponding to a rate at which spikes occur in the pressure signal; a routine stored in the memory and adapted to be executed by the processor to generate first statistical data from the filtered data, wherein the first statistical data comprises an indication of a standard deviation of the pressure signal at the frequency component; a routine stored in the memory and adapted to be executed by the processor to generate second statistical data from the unfiltered received data, wherein the second statistical data comprises an indication of a standard deviation of the unfiltered pressure signal; and a routine stored in the memory and adapted to be executed by the processor to analyze the first statistical data and the second statistical data to detect whether one or more abnormal situations associated with an agitator of the stirred vessel exist based on changes in one or more of the group consisting of;
the standard deviation of the pressure signal at the frequency component and the standard deviation of the unfiltered pressure signal. - View Dependent Claims (25)
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Specification