To effectively use an , you must understand its core technical requirements. The standard breaks down the inspection into three distinct phases.
For onshore and offshore pipelines, ISO 17637 is used before and after each weld pass. Lack of fusion at the root is a frequent reject reason. iso 17637 pdf
| Standard | Scope | Key Difference | |----------|-------|----------------| | | Fusion welds in metals | Global standard; references ISO 5817 | | AWS D1.1 | Structural steel welding | US-centric; has its own visual acceptance criteria | | ASME Section V | Pressure vessel and piping visual exam | More focused on nuclear and boiler codes | | EN 970 | (Withdrawn, replaced by ISO 17637) | Historical European standard | To effectively use an , you must understand