WHAT IS A MAJOR STRUCTURAL DISCONTINUITY?

摘要

Every part of API 579 has rules addressing the case where a defect is too close to a "Major Structural Discontinuity" (MSD). But I've noticed in the API 579 training I've conducted for the last 15+ years, that most of the people in the course are unclear on exactly what constitutes an MSD. In this column, I'll discuss the MSD: what an MSD is, and why it is so important in fitness-for-service (FFS) assessments.