One of the main reasons for the failures of pipelines is corrosion. Several methods have been developed for assessing the internal pressure of failure in corroded pipes. Among the semi-empirical analytical methods, ASME B31G, modified B31G and RPA stand out. These methods are deterministic in nature and therefore, do not consider uncertainty in the variables involved and consider only simplified configurations for defects. The First Order Reliability Method (FORM) was used to assess the probability of failure of a pipeline subject to corrosion defects. Multiple parameters of the pipeline and the defect's geometry: such as, diameter and thickness of the pipe's ultimate stress, drainage of the duct material, defect length and depth, and fluid pressure were considered as random variables. One example using all of the methods was given to demonstrate the feasibility of this procedure. Radial corrosion rate was the most significant contributor to the pipeline failure in the long term.
Corroded pipelines; safety assessment; FORM
