In-line inspection detects early cracking on Canadian crude-oil line

Susan E. Miller Interprovincial Pipe Line Inc. Edmonton Michael A. Gardiner, Clive R. Ward BG Technology Loughborough Leicestershire, U.K. An elastic wave in-line inspection (ILI) tool has arrived at a pig-receipt station after a run to detect cracks along Interprovincial Pipe Line's Line 3 (Fig. 2). [52,683 bytes] A fatigue crack, like this one shown in cross-section from a 1989 Line 3 fatigue crack, can grow gradually over years and fail under normal line operation (Fig. 3). [45,470 bytes] Crews excavate a section of Line 3 to verify results of the EW-vehicle analysis (Fig. 5). [58,438 bytes] Defects repaired by sleeving in 1996 [21,1...

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