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Research on Fuzzy Comprehensive Evaluation Technology of Corrosion Protection for Buried Steel Pipeline

Author: LiuChunBo
Tutor: WangXinHua
School: Beijing University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Buried steel pipeline Fuzzy Comprehensive Evaluation Grey Relational Analysis Evaluation criteria
CLC: TG174
Type: Master's thesis
Year: 2007
Downloads: 428
Quote: 4
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Abstract


Pipeline transportation for its high efficiency, low-cost, safe and reliable advantage plays an increasingly important role in the national economy. With the operating loss of the pipeline for a long time, the natural aging of the equipment, geography and climate changes in the environment, as well as man-made damage and other reasons, the leakage failure occurred, and brought a huge potential threat to people's life, property and living environment, while can also cause a serious waste of resources. Therefore, in order to guarantee the safe operation of the pipeline, the need for timely and accurate detection of pipeline operating conditions, to improve the effectiveness and evaluation of pipeline corrosion protection status classification accurate and scientific, with its economic losses and minimize environmental pollution. Paper analyzes the various detection of pipeline corrosion protection technical principles, advantages and disadvantages as well as the detection instrument characteristics, in accordance with the relevant instrument information, engineering practice and field trials explicitly different technical methods covering layer inspection applicability of buried steel pipeline and buried steel pipeline outer cover inspection, a combination of technical methods. The paper analyzes the surroundings of buried pipeline corrosion grading evaluation stray current strength evaluation, covering layer condition evaluation and cathodic protection effectiveness evaluation. Grading evaluation criteria for the three-layer PE insulation resistance of asphalt overlay rate, based on the exchange of current decay method, considering the effects of the pipe diameter db / m evaluation criteria of the current decay rate for three-layer PE asphalt overlay and does not consider the influence of the pipe diameter to db / m ~ 3 units of the current decay rate evaluation standards. On the basis of detailed analysis of the impact of buried steel pipeline corrosion factors, to establish a comprehensive evaluation model based on the theory of fuzzy evaluation of buried steel pipeline corrosion protection status. Reasonable selection of typical factors affecting pipeline corrosion, according to certain hierarchical evaluation criteria, to establish the evaluation set. Significant rights theory to determine the effects of factors established by subordinate function single factor evaluation matrix, fuzzy processing of each factor using analytic hierarchy process and gray relational analysis. In considering the weight of each factor on the basis of selecting the appropriate fuzzy operator, through the quantitative analysis method to evaluate the corrosion protection status of the pipeline. The gray relational analysis and engineering data and mathematical statistics to study the detection parameters (soil resistivity, pipeline burial depth) affect the status of the overlay. The practice shows that the fuzzy evaluation system and the establishment of the covering layer condition and testing parameters correlation analysis method has certain value of engineering applications and reliability. Paper prepared for buried steel pipeline corrosion protection evaluation software for pipeline inspection evaluation criteria, the results of the evaluation of information management, single factor evaluation of the pipeline, the calculation of the fuzzy comprehensive evaluation and coating defects status and detection parameters related Analysis calculated.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection
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