Pipeline Integrity Management Under Geohazard Conditions (PIMG)
Chapter 31 CORRELATION OF SINGLE-RUN ILI IMU BENDING STRAIN FEATURES TO GEOHAZARD LOCATIONS
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In-line-inspection (ILI) inertial measurement unit (IMU) data have been used to identify sections of pipelines bent or deflected by an outside force (e.g., a geohazard) for over 25 years, and particularly since the recent widespread adoption of the use of the IMU tool to more accurately map pipeline centerlines. In principle, the concept is simple: the ILI vendor reviews the IMU data and excludes construction related bends (e.g., sag bends, over bends, side bends). Bends that extend across one or more girth welds are inferred not to have been deliberately constructed and are reported by the vendor as “bending...