NDT

Common Crack Types of Pressure Vessels and Pipelines and their NDT Techniques Common crack types of pressure vessels and pipelines: Stress corrosion cracking Stress corrosion crack is a common type of crack, which is related to the interaction of internal and external stress and corrosion medium. Common in the boiler steam pipe and container seat, mainly tied in the pipeline outside. When the pressure on the outer surface of the pipeline exceeds the stress limit of the region, it will inevitably lead to the external deformation and cracking of the pressure pipeline. Mechanical Fatigue Crack Mechanical fatigue cracks are common in rotating machinery parts such as impeller, blade and shaft in boiler auxiliary system. This kind of crack mainly includes two stages, namely, the early stage of long crack propagation and the late stage of tangential crack formation. Therefore, the formation of mechanical fatigue crack is related to the running […]