Abstract: Hydrogenation reactor suffers from a combination of high temperature, high pressure and cyclic load in the process of service, and the effects of creep and fatigue must be taken into account in design. ASME code case 2605 provides a creep fatigue life design method for hydrogenation equipment made of 2.25Cr1MoV steel. With the aid of finite element analysis software ANSYS, a design example of the joint of cylinder and nozzle is introduced to elaborate the design idea and method of the case, and the effects of operating temperature and pressure on the design life are discussed. The results show that creep fatigue damage evaluation meets the safety requirements, and the joint of cylinder and nozzle appears stress concentration. Due to creep strain, the stress value and the rate of creep damage accumulation decrease with the increase of creep time. At the same time, the creep damage increases with the increase of operating temperature and pressure. In addition, the fatigue stress amplitude has greater influence on the life of structure. According to the results, some improvements on creep fatigue life of structure are proposed.

Key words: 2.25Cr1MoV, creep fatigue, hydrogenation equipment