Corrosion Risk Assessment Model of Gas Pipeline Based on Improved AHP and Its Engineering Application

The paper is aimed at establishing a corrosion risk assessment model for the buried gas pipeline. To realize the forecast of the gas pipeline corrosion damage risks, the adverse factors of the safe operation were classified, and the index evaluation system of possibility of gas pipeline failure was established based on five first-level indicators and six second-level indicators. According to the index evaluation system, improved analytic hierarchy process (I-AHP) method was used to determine the weight of each indicator, and then the fuzzy comprehensive evaluation was proposed based on improved AHP. The calculation and analysis were carried out, and the membership function of the fuzzy comprehensive evaluation suitable for gas pipeline corrosion risk assessment was obtained, which had improved the practicability. Taking the buried gas pipeline network of Suzhou Industrial Park, China, as an example, the assessment was carried out. Some buried gas pipelines were randomly selected for excavation to verify the degree of conformity between the observation results and the calculation results. The results show that: the evaluation results of this method are consistent with the field detection results. In addition, the evaluation model established in this paper can provide a reference for the establishment of accident database and the management for the pipeline operation enterprise.