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Instrument meter freezing fault rapid detecting method

A detection method and instrument technology, applied in the direction of instruments, etc., can solve the problems of inability to effectively detect the failure of instruments and frozen meters

Inactive Publication Date: 2009-05-06
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiency that the existing instrument fault detection method cannot effectively detect the fault of the frozen meter, the present invention provides a rapid detection method for the fault of the frozen meter that can effectively detect and alarm after the fault of the frozen meter occurs

Method used

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  • Instrument meter freezing fault rapid detecting method
  • Instrument meter freezing fault rapid detecting method
  • Instrument meter freezing fault rapid detecting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] refer to figure 1 , a quick fault detection method for an instrument frozen meter, comprising: 1), setting the sampling data window time of a measured variable A, collecting n measured variables, and removing gross errors from each measured variable;

[0049] 2), establish a linear equation of unary regression, the host computer adopts a linear regression method to fit the DCS data within the sampling data window time, and the fitted linear equation is (1):

[0050] A ^ = a ^ + b ^ t - - - ( 1 )

[0051] in,

[0052] b ^ = Σ i = 1 n t ...

Embodiment 2

[0124] refer to figure 1 , in the present embodiment, calculate residual sum of squares in step 2):

[0125] Q = Σ i = 1 n ( A i - A ^ i ) 2 ;

[0126] The fault detection method also includes:

[0127] 4) The sum of squared residuals of the fitted straight line is compared with the historical data of the meter to be tested when it is in normal operation. If the ratio is less than the threshold, it is judged to be a fault of the frozen meter.

[0128] The upper computer calls the data of DCS through the OPC server interface, which can realize the call and analysis and calculation once a minute. For the data within 5 minutes, the d...

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Abstract

The invention provides a method for quickly detecting the failure of freezing a meter, comprising the following steps that: (1)a sampling data window time of measured variable A is set, n measured variables are acquired, and each measured variable is subjected to gross error elimination; (2) an equation of linear regression in one unknown is established; (3) the meter failure is judged by using a comparison method, comprising that: (3.1) when the meter to be detected is in the adjusting loop, the measured value of the meter to be detected is set to vary in the same direction or opposite direction to the measured value of other meters; when it is detected that the measured values of the meter to be detected and other meters vary in opposite direction or the same direction, the failure of freezing a meter is judged; (3.2) when the meter to be detected is not in the adjusting loop, the variable quantity within the sampling data window time is calculated according to the linear equation (1); when the variable quantity surpasses the upper limit threshold value, the failure of freezing a meter is judged. The invention provides a method for quickly detecting the failure of freezing a meter, which can effectively detect and alarm after the failure of freezing a meter appears.

Description

technical field [0001] The invention relates to the field of instrument fault detection, in particular to a fault detection method for frozen meters based on a DCS distributed control system and APC advanced control prediction technology. Background technique [0002] In the process of petroleum and petrochemical production, most of the water system and steam system are in the open air, and the sampling pipelines of the detection instruments of these systems basically use water as the conducting medium. Such as steam system pressure, flow measurement, water system pressure, flow measurement, etc. In the north, the sampling pipelines and transmitters of these testing instruments need to be equipped with heat tracing insulation systems to ensure that the water medium in the sampling pipelines of the instruments does not freeze in the severe winter, so that the pressure conduction is normal, so that the instruments work normally. However, the maintenance workload of the heat t...

Claims

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Application Information

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IPC IPC(8): G01D18/00
Inventor 王慧
Owner CHINA NAT OFFSHORE OIL CORP
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