通过对国外管道腐蚀开裂的调研, 针对管道应力腐蚀与氢致开裂问题, 分析了二者的腐蚀评估模型及其敏感性, 针对现有标准和评估方法中对焊缝缺陷评价的适用性尚不明确的问题, 通过案例分析提出了制定符合国内应力腐蚀开裂评价标准的急迫性。通过对管道进行相控阵与射线检测的对比, 发现腐蚀缺陷评估目前主要针对体积型缺陷, 对环焊缝评估还需进行深入研究。分析表明, 相控阵与射线检测不可互相替代且各有优缺点, 对内部腐蚀、夹杂、裂纹等的检测应联合两种方法。

Aiming at the problem of pipeline stress corrosion and hydrogen induced cracking, the corrosion evaluation model and its corresponding sensitivity were analyzed through the investigation of foreign pipelines. Because the applicability of existing standards and evaluation methods for weld defects is not clear, it is proposed that the need for the domestic stress corrosion cracking evaluation standard by means of case analysis is imminent. The construction and development of hydrogen pipeline causes HIC gradually expanded, which needs a system research. Combined with the Shaan-Jing gas pipeline management practice, through the comparison of the phased array and ray detection, it was found that the corrosion defect assessment mainly is performed for volume defects, while the weld assessment needs to be further studied. The comparative analysis of array and X-ray detection showed that the two methods cannot replace each other, and each of them has advantages and disadvantages. They should be combined for the detection of internal corrosion, impurities and cracks.