Pressure-bearing equipment test pressure calculation method based on differential pressure type fatigue test system

The invention discloses a pressure-bearing equipment test pressure calculation method based on a differential pressure type fatigue test system. Pressure-bearing equipment is placed in an outer container; injecting a test medium into the pressure-bearing equipment, so that the internal pressure of the pressure-bearing equipment reaches P2 and remains unchanged; injecting an inert hydraulic mediuminto the outer container, and changing the internal and external pressure difference of the pressure-bearing equipment by changing the internal pressure of the outer container so that a cyclic test similar to that of an internal pressure type fatigue test system is realized; determining the test pressure and fatigue cycle index of the pressure-bearing equipment in the differential pressure type fatigue test system on the premise that the alternating stress amplitude and damage equivalence of the pressure-bearing equipment in the differential pressure type fatigue test system and the internal pressure type fatigue test