Combined with the finite element method

stress analysis on lamination defects of the high-pressure heater shell was conducted

by series of tests on 16MnR material which is used for the high-pressure heater

such as normal temperature tensile test

high temperature tensile test

and COD test.Based on the "fitness for service" principle

safety evaluation

fatigue assessment

remaining life assessment and stability analysis were carried out according to the British Standard BS 7910.Results show that

evaluating points of 10 lamination defects on high-pressure heater shell for the No.2 300 MW unit in a power plant are all in the safe zone;the maximum stess intensity factor is 923 N/mm3/2;the residual life is 1 250 times;membrane stress of the shell is smaller than the bulkling stress.Under normal operation condition

the vessel's lamination defects will not affect its safe and stable operation.