What are the starting pressure and the \"overpressure limit\" for the overpressure limit?

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What are the definitions of the \"starting pressure for overpressure limit\" and \"overpressure limit\" for containers mentioned in clauses B3.1 and B3.2 of GB150.1? The overpressure limit of a container refers to the maximum allowable pressure increase within the vessel when the overpressure relief device activates, relative to the maximum allowable operating pressure (or design pressure). It is a pressure parameter that indicates the vessel’s maximum load-carrying capacity after the relief device operates, and it should not be used in normal operating conditions. Generally, no specific calculations are required for this value during design. The starting pressure for the overpressure limit can be understood as the maximum pressure that a container is allowed to withstand before the pressure relief device activates; it is determined by the designer, and the basis for this determination may be the design pressure or the maximum allowable operating pressure.