Abstract:

A urea reactor of which the lining has a round pit defect under the leak detecting hole was studied through finite element analysis and stress corrosion threshold value calculation. The results showed that the stress concentration causedby the round pit could provide an external condition for stress corrosion. So thestress corrosion crack happened under the simultaneous actions of stress concentration and chloride ions.

Key words: urea reactor; lining; ANSYS; chloride ion; stress corrosion