History shows that change is a catalyst for innovation; it challenges existing norms and encourages the exploration of new possibilities. The development and commercialization of spirally magnetized inline inspection (ILI) tools did exactly this; challenged existing norms.

This paper explores the enhancement of pipeline inspection results using a spiral field magnetic flux leakage (SMFL) technology. Traditional axial and circumferential MFL tools, while commonly employed for detecting pipeline anomalies, exhibit specific limitations. Axial MFL is effective in identifying circumferential features but struggles with axial anomalies, while circumferential MFL can detect axial features yet may misclassify volumetric defects. To address these shortcomings, this paper reviews SMFL technology, which magnetises the pipe in a helical direction, enabling the combined benefits of both axial and circumferential MFL. By doing so, it improves detection of seam-weld and axially oriented crack-like anomalies and features, offering greater accuracy in anomaly classification. Additionally, the integration of spiral MFL, axial MFL, and other ILI technologies provides a more comprehensive assessment, reducing false positives and unnecessary excavations. The benefits of SMFL technology are confirmed with nearly 15 years of field results and incorporation into API1160 and API 1176 industry standard references. It is clear that SMFL technology significantly enhances pipeline integrity assessments, ultimately improving operational efficiency and reducing costs.