Abstract: Storage tanks serve as critical equipment for energy storage and are widely utilized in the petrochemical industry. Damage accidents caused by overpressure of medium in storage tank occur from time to time. Accurate prediction of the pressure at the roof-to-shell junction is critically important for ensuring weak roof-to-shell attachment failure occurs during overpressure scenarios. Therefore, this paper took a dome-roof tank as the research object and the failure pressure at its roof-to-shell junction using method and simulation method respectively. It conducted a analysis of the failure pressure assessments at the tank roof-to-shell junction, evaluating elastic failure versus elastoplastic failure under varying stress evaluation criteria. The calculation results indicate that the failure pressure at the roof-to-shell junction progressively decreases with increasing tank diameter; the analytical method yields the lowest failure pressure, amounting to only half of that from numerical simulation; and the failure pressure values calculated using the linear elastic strength failure assessment method are 1.2 times those obtained from the elastoplastic yield failure assessment method. The research findings can provide references for the estimation of failure pressure at the tank roof-to-wall junction and for weak roof-to-shell attachment design.

Key words: tank, roof-to-shell junction, failure pressure, linear elastic failure, elastoplastic failure