Safety Assessment for Reaction Vessel Containing Cracks Based on the Principle of Fit-for-Service

This paper is about safety assessment for the pre-hydrogenation reactor with a surface crack. The pre-hydrogenation reactor contains a weld-crack defect. Safety assessment of in-service pressure vessel is based on the principle of "fit-for-service". The author has safety assessment in accordance with Chinese national standard Safety Assessment for In-service Pressure Vessels Containing Defects (GB/T 19624-2004 ). The pre-hydrogenation reactor with crack defect is in the margin of safety through the safty assessment and result analysis.