A Study on Fatigue Characteristics of API 5L X42 Gas Pipeline

摘要

Generally, gas pipelines are buried in depth of less than 1.5 m from the ground or are exposed on the ground to handle the process of gas. Therefore, gas pipelines are repeatedly damaged by various types of external loads. Especially, because earthquake-induced damage to the gas pipelines can lead to fire by a gas leak and damages of human lives and properties, the integrity of gas pipelines is highly significant. For these reasons, an earthquake resistant design must be applied to gas pipelines considering the importance and characteristics of structures. For this, the evaluations of mechanical properties of gas pipelines for seismic loads should be performed. Therefore, in this study, API 5L X42 gas pipelines were used for estimation of fatigue behavior of gas pipe line structures. The ASTM standard specimens and curved plate specimens were collected from an API 5L X42 gas pipeline, and the fatigue tests were performed. Also, after the Stress-Number of cycles curve was obtained, we compared and examined them.