Method and device for girth weld evaluation

Abstract

The invention discloses a circumferential weld assessment method and device and belongs to the field of pipeline assessment. The method comprises the steps that a plurality of assessment data of a to-be-assessed circumferential weld are obtained and comprise the at least one detecting datum and the at least one construction datum; from the multiple assessment data, the at least one risk assessment datum is obtained, and the risk assessment data conform to the preset risk conditions; at least one risk value is obtained and corresponds to the risk conditions which the risk assessment data conform to; according to the at least one risk value, the to-be-assessed parameter is determined and is the sum of the at least one risk value or the number of the at least one risk value; whether the to-be-assessed parameter is larger than the preset parameter threshold value or not is judged; and if the to-be-assessed parameter is larger than the preset parameter threshold value, the to-be-assessed circumferential weld is marked as the dangerous circumferential weld. According to the circumferential weld assessment method and device, the accuracy of the assessment of the circumferential weld is improved, and the circumferential weld located in the dangerous state can be accurately and comprehensively recognized.

Description

technical field [0001] The invention relates to the field of pipeline evaluation, in particular to a girth weld evaluation method and device. Background technique [0002] Girth weld refers to the butt weld between pipe and pipe. Among them, the girth weld has always been an important factor affecting the safe operation of pipelines. Since the girth weld is welded on site, its quality is difficult to guarantee due to the limitation of technical level and site construction conditions. In recent years, there have been many cracking accidents of girth welds of oil and gas pipelines in China. Due to the characteristics of long crack length and large leakage, girth weld cracking accidents are likely to cause serious threats to the safety of surrounding personnel and the environment, especially for some pipelines. There are problems such as difficulties in emergency repair work, strict requirements for pipeline shutdown, and many environmentally sensitive points. Once a girth w...

AI Technical Summary

Problems solved by technology

[0005] The magnetic flux leakage internal detection technology can only detect a limited number of factors that lead to the failure of the girth weld, such as the depth of the girth weld defect, but it cannot detect some key factors that are difficult to quantify and lead to the failure of the girth weld , which leads to the low accuracy of evaluating the girth welds by using the magnetic flux leakage internal detection technology, that is, it is impossible to accurately and comprehensively mark the girth welds in a dangerous state

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