Mark Olson, Director, ENTEGRA, USA, presents pinhole assessment utilising UHR axial MFL ILI. Shifting paradigms is difficult, yet the advent of ENTEGRA ultra-high-resolution (UHR) magnetic flux leakage (MFL)/caliper combination tools has helped to change industry perception regarding the detection, characterisation, and sizing of true pinhole/pilferage anomalies. Prior to the advent of UHR ILI systems, the typical 'pinhole' metal loss detection and sizing specification for axial MFL was limited to probability of detection (PODs) and probability of identification (POIs) of 'maybe' with an accuracy of 'detectable'. According to Pipeline Operators Forum (POF) and API 1163, a pinhole shaped anomaly is defined as being smaller than or equal to 10 mm x 10 mm (axial length x circumferential width). ENTEGRA's definition considers internal and external pinhole metal loss anomalies with a minimum size of 3 mm x 3 mm.
展开▼
