Assessment of corroded API 5L X52 pipe elbow using a modified failure assessment diagram

Pipe elbows (bends) are considered critical pressurized components in the piping systems and pipelines due to their stress intensification effect of bend curvature. They prone hence more exposed different corrosion failure modes than straight pipes. Late detection such elbow damages can lead dangerous emergency situations which cause environmental disasters, pollution, substantial consumer losses a serious threat human life. A comprehensive safety reliability assessment pipe elbows, including usage prediction models, provide significant increases service life pipelines. It is well known that limit pressure an important parameter assess integrity. In this paper, integrity damaged pipeline made API 5L X52 steel was done within framework numerical modeling using finite element method (FEM) analysis (FEA). The evaluation numerically FEM modeled corroded containing rectangular parallelepiped-shaped defect with rounded corners at intrados section compared codes for calculating pressure. Moreover, area defects relative depth wall thickness ratios where highest hoop exists. results showed pipes could not be applied significantly higher error obtained value results. However, modified codes, adapted case Goodall formula calculation pretty consistent FEA notch diagram (NFAD) also used bends ratios, while further highlighted criticality as essential component. • Integrity investigated based on parallelepiped borders created section. analyses (FEA) were modify codes. Two models (modified B31G DNV RP-F101) agrees confirms criticality.