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          CN 51-1183/TE

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The Method for Life Evaluation of Internal Coating of In-service Pipeline Based on Fuzzy Theory
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Key Words: pipeline; fuzzy theory; internal coating; evaluation
Abstract:Because the internal coating of pipeline unable to examine and check up directly. So, it is particularly important to carry out the dependability assessment and life evaluation for the internal coating of in-service pipeline. In order to improve the scientificity and rationality of life evaluation of internal coating on in-service natural gas pipeline, the evaluation model of life evaluation of internal coating based on fuzzy theory is proposed. The model transforms the fuzzy appraisal of zone index to the overall fuzzy appraisal by fuzzy evaluation, and the final evaluation score can be computed combined with comment set. The model structure and concrete steps have been clarified in this paper, the evaluation index system has been established by the level method and combining the literature data and the actual coating process, includes 4 first grade indexes and 24 second grade indexes according to the actual conditions of coating of a certain natural gas pipeline, and applied to the life evaluation of resistance-reducing internal coating of five-year-old in-service natural gas pipeline, the application results indicated that it is feasible.
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