Failure risk evaluation of coating in pipelines based on unascertained measure theory
In order to improve the management control level of coating quality in pipelines,an evaluation index system of three-level index and five-level risk was established by considering coating performance,service environment,coating aging,and construction defects.The differences and uncertainties among evaluation indexes were eliminated by constructing a single index measure,calculating composite weight,and setting a multi-index measure.The validity was introduced to improve the identification criteria of unascertained measure theory,and the risk grade was evaluated and applied in engineering.The results show that the composite weight can reduce the disadvantages brought by the weight results from improved interval analytic hierarchy process(IAHP)and coefficient of variation methods.In the primary index,the influence of coating performance has the largest weight.In the secondary index,the influence of electrochemical impedance value,pigging frequency,service time,and construction level has a larger weight.The evaluation results are consistent with the actual situation,which proves the scientificity and validity of the model proposed in this paper and provides a new method for the risk evaluation of inner coating failure.
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维普
