On the assessment of non-metallic inclusions by part 13 of API 579 -1/ASME FFS-1 2016

Improvement of nondestructive inspection techniques has made more frequent the detection zones containing closely spaced non-metallic inclusions in pressure vessels low carbon steel. In present study, an in-service cylindrical horizontal vessel were detected by Scan-C ultrasonic and considered as laminations to be assessed Part 13 API 579-1/ASME FFS-1 2016 standard. The outcoming results rejection for Level 1 assessment, a repair or replacement component was required, even though it retained significant remaining strength. Thus, alternative procedure assess mechanical integrity is proposed with adequation some criteria standard procedure, taking into consideration dimensioning grouping characteristics inclusion zones, providing reasonable results.