基于外检测的新投产管道合于使用评价实践

目的落实油气管道定期检验工作,确保管道安全平稳运行,方法通过对西南管道公司所辖某天然气管道进行外腐蚀直接检测,包括管线敷设环境调查、防腐层状况不开挖检测、管道阴极保护有效性评价检测以及开挖直接检验。根据检测结果进行合于使用评价,包括应力分析计算、剩余强度评估、管道剩余寿命预测等。结果管道允许使用,再评价间隔5年。结论直接检测方法采用多种检测手段对管道外腐蚀情况和防腐保护系统进行管道全面检验,并出具合于使用评价,是一种综合的完整性评价方法,符合法定检验的要求,其评价结果可作为管道完整性管理的可靠依据,可据此制定管道的维修方案和预防措施。

Practice of Applicability Evaluation of New Production Pipelines Based on External Detection

Objective To carry out periodic inspections of oil and gas pipelines and ensure safe and stable operation of the pipelines. Methods Direct detection of external corrosion was carried out on a natural gas pipeline under the jurisdiction of the Southwest Pipeline Company, including investigation of pipeline laying environment, detection of condition of anti-corrosion layer and effectiveness of cathodic protection of pipeline and direct inspection of excavation. According to the test results, it was used for use evaluation, including stress analysis calculation, residual strength assessment, pipeline residual life prediction and so on. Results The pipeline might be used and the evaluation interval was 5 years. Conclusion A variety of detection methods are used as direct detection methods to conduct comprehensive pipeline inspection on external corrosion of the pipeline and the corrosion protection system. It is also a comprehensive assessment method for integrity. It is a comprehensive integrity assessment method that meets the requirements of statutory inspections. Its evaluation results can be taken as a reliable basis for pipeline integrity management. Pipeline repair plans and preventive measures can be formulated accordingly on this basis.