Thanks. You know, during coke drums working, it is from 480centi grade(temperature)to 50centigrade(temperature)continously for coking and decoking. So there exists thermal stress, forther more, the coke drun endures internal pressure. The coke drum will failure because of thermanl fatigue through many cycles someday.We need analyzing the continous thermal stress changing. That is the heat transient analyze. Who can do it? Who owns such software. It is said there is an american company which can do it? Who could tell me in detail? Many thanks.