METHOD OF MEASUREMENT ERROR COMPENSATION OF COVERED DISTANCE BY PID ODOMETRIC SYSTEM BRINGING DIAGNOSTIC DATA TO RATED LENGTHS OF PIPE SECTIONS Russian patent published in 2017 - IPC G01B11/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the process of processing the results of inline diagnostic surveys of oil and oil product pipelines, performed by all methods of nondestructive testing, namely, to the method for constructing the display of diagnostic data on a pipe scheme. Claimed method of measurement error compensation for covered distance of PID (pipe inspection device) odometric system bringing diagnostic data to rated lengths of pipe sections, which is based on the availability of reference scheme of the diagnosed area of the pipeline in accordance with the rated lengths of pipe sections and consists of hardware: pipe inspection device; workstation with a program-terminal, designed for data upload; file server for data storing; workstation with diagnosed data interpretation program; and works on the basis of the following algorithm: - "Calculation of deviation in coordinate information data from the rated values of pipe sections", and in order to calculate compensation values, they construct the scheme of pipelines based on the corrected diagnostic data, and the reference scheme is used as integrated infomration. Then the pipe sections are sequentially selected calculating the difference in the ranges of transverse joints of the pipe sections, an object dictionary is built, where the key is the number of the pipe section, and the tuple value with the following information: - difference with the absolute ranges in meters; - concordance coefficient of odometric speed; - the range of lengths of a pipe section in odometer impulses; - "Data correction of coordinate information", for that they check the object dictionary for records, if there are none, bringing of the coordinate information is not required; then the correction is done in the cycle in all records of the dictionary in each range of odometric information considering the concordance coefficient and based on the defects, detected earlier, and features of the area with newly received diagnostic data. Then the measurement error compensation for the covered distance of the pipe inspection device odometric system is done along with bringing the lengths of the pipe sections and, accordingly, the whole diagnosed area of the pipeline to the rated data of the pipe sections. When updating the odometric information, the data of angular position are not changed, the information on the motion speed of the pipe inspection device becomes actual.

EFFECT: development of a measurement error compensation method for the covered distance of the odometer system of the pipe inspection device and bringing the length of the pipe sections and, accordingly, the length of the entire diagnosed area of the pipeline to the rated lengths of the pipe sections, and also simplification of combining information on previously detected defects and features in this area with newly received diagnostic data.

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