Pipelines failures during its service life caused by the impact of multiple corrosion defects are most probable to occur, which may induce severe consequences as compared to single defect acting alone. Interaction rules were developed for multiple defects in the longitudinal and circumferential directions previously, but the knowledge on two or more defects aligned radially is still not well understood. This paper aims at investigating new interacting limits when corrosion defects are acting both on the internal and external wall, separated by a radial spacing, S_R. The studies were carried out using burst test experiments as well as numerical modelling using pipe specimens of type API 5L X42. Six colonies of radial interacting corrosion defect arrangements were tested. The paper investigates the effects of the radial interaction by means of radial limit, $S_R^{\mathit{Lim}}$. It was found that increasing the defect depths of internal and external defects would highly reduce the failure pressure, P_multiple. Depending on the orientations of the multiple defects acting radially, the failure pressure may be less or more than the case of single defect, P_single. Thus, the failure pressure ratio of P_multiple/P_single should be used as a measure, with any values larger than 0.99 depict no interaction taken place among those multiple defects. From the six colonies, only two colonies showed the significance of radial interactions. The paper then suggests that when radial interaction does not presence, multiple corrosion defects acting radially may then be treated as single defect.

与多个单独的缺陷相比，在管道的使用寿命中，由于多种腐蚀缺陷的影响而引起的管道故障最有可能发生，这可能会导致严重的后果。先前已经针对纵向和圆周方向上的多个缺陷开发了交互规则，但是对沿径向排列的两个或多个缺陷的知识仍未很好地理解。本文旨在研究当腐蚀缺陷同时作用于内壁和外壁时（以径向间距S _R隔开）的新的相互作用极限。使用爆破试验实验进行了研究，并使用API​​ 5L X42型管道样品进行了数值建模。测试了六个径向相互作用的腐蚀缺陷排列的菌落。本文通过径向极限研究了径向相互作用的影响，${\mathrm{小号}}_{\mathrm{[R}}^{\mathit{林}}$。已经发现，增加内部和外部缺陷的缺陷深度将极大地降低破坏压力P_倍。取决于径向作用的多个缺陷的取向，破坏压力可能小于或大于单个缺陷P _{single的情况}。因此，P_倍/ P_单的破坏压力比应该用作度量，任何大于0.99的值都表示在多个缺陷之间没有发生相互作用。在六个菌落中，只有两个菌落显示出径向相互作用的重要性。论文然后提出，当不存在径向相互作用时，则可以将多个径向作用的腐蚀缺陷视为单个缺陷。