Acoustic emission for detection of process-related damage in pressure vessels and piping

摘要

Abstract: Although acoustic emission testing is generally grouped with other nondestructive evaluation techniques (NDE) such as magnetic particle testing, it differs fundamentally in the way it detects defects. While common NDE methods seek to illuminate a defect using some sort of energy source, acoustic emission detects deformation processes as they occur. That is to say, only so called 'active' cracks are detected. In other words, acoustic emission testing is sensitive to sharp, process related defects and insensitive to fabrication or other blunt defects at normal service or test loads. It is this property, sensitivity to service related damage, that makes AE a good candidate for detection and monitoring of inservice equipment. !0