Abstract: With the development of finite element method, it has become a trend for the design of electrothermal tank, but the finite element analysis method and checking criterion of electrothermal tank have not formed the industry standard. Based on the stress analyzing of electrothermal tank, a method is proposed that according to the stress classification of pressure vessel, linearize the finite element analysis results of the tank and check it with the corresponding standards.

Key words: Electrothermal tank, Finite element method, Pressure vessel, Stress linearization