Abstract

The fitness-for-service procedures for local thin areas in pipelines trade complexity for conservatism, with more complex procedures being less conservative. In this paper, we outline a procedure for automating the advanced Level 3 assessment procedure outlined in API 579-1/ASME FFS-1 for local thin areas. The outlined procedure is bundled into a web-enabled, industrial trade tool where the minimum data requirements are the same as those for a Level 2 assessment. The procedure can be applied to an entire in-line inspection scan of UT thickness readings and, after calculation, can identify hotspots of local damage. By reducing the inputs to those of a Level 2 assessment procedure, the Level 3 procedure presents as an attractive alternative to the current Level 2 approaches.

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