Method of in-tube ultrasonic flaw detection
First Claim
1. A method of in-tube ultrasonic flaw detection of pipelines by passing inside the pipeline an inspection pig carrying ultrasonic transducers, devices for measurements, processing and measured data storage, by emitting probing ultrasonic pulses during the pig travel and receiving the reflected pulses corresponding to said probing pulses, by obtaining data on the time intervals corresponding to the transit time of said pulses, by conversion and storage of the measured data;
- during said data conversion a sequence of the obtained values of the transit time of the ultrasonic pulses is formed, the number of obtained values of said sequence within a certain range is calculated and recorded in a storage device, wherein in the process of data conversion an area of values of a certain width is found, which has the maximum number of obtained values of said sequence, said range of values is found, in which at least one value relates to the found area of values, said number of obtained values of said sequence within said range is recorded in said storage device together with a code uniquely corresponding to said area of values and/or said range of values.
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Accused Products
Abstract
The claimed method of in-tube ultrasonic flaw detection of pipelines is effected, in accordance with one embodiment, by placing inside a pipeline an inspection pig or flaw detector having ultrasonic transducers, devices for measurements, processing and storage of the measured data. During the pig travel, the transducers emit probing ultrasonic pulses and receive the reflected pulses corresponding to said probing pulse thus deriving data on the time intervals corresponding to the transit time of said pulses, the measured data being converted and stored. In the process of the data conversion a sequence of values of the transit time of the ultrasonic pulses is formed, an area of values of a certain width is derived, in which the maximum number of the obtained values of said sequence is located, the range of values uniquely corresponding to the found area of values, in which at least one value relates to the derived area of values, the number of obtained values of the sequence laying in said range of values is recorded in said storage device together with a code uniquely corresponding to said area of values and/or said range of values. The obtained values beyond the limits of said range of values are directly recorded in the digital data storage device. The implementation of the claimed method allows one to, for example, increase the efficiency of compression of the ultrasonic data, especially when detecting the flaws in the linear part of trunk pipelines including pipe with different nominal thickness of the walls, and in the presence of flaws such as <<lamination>> and similar flaws in the pipeline.
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Citations
13 Claims
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1. A method of in-tube ultrasonic flaw detection of pipelines by passing inside the pipeline an inspection pig carrying ultrasonic transducers, devices for measurements, processing and measured data storage, by emitting probing ultrasonic pulses during the pig travel and receiving the reflected pulses corresponding to said probing pulses, by obtaining data on the time intervals corresponding to the transit time of said pulses, by conversion and storage of the measured data;
- during said data conversion a sequence of the obtained values of the transit time of the ultrasonic pulses is formed, the number of obtained values of said sequence within a certain range is calculated and recorded in a storage device, wherein in the process of data conversion an area of values of a certain width is found, which has the maximum number of obtained values of said sequence, said range of values is found, in which at least one value relates to the found area of values, said number of obtained values of said sequence within said range is recorded in said storage device together with a code uniquely corresponding to said area of values and/or said range of values.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
Specification