On the calculation of safety valve discharge volume

Analyze one or more possible accident scenarios based on three types of accident conditions: fires, human error, and equipment failures, and calculate their respective maximum release amounts. The operating condition with the highest discharge volume is the design condition of that safety valve; the maximum discharge volume should not be calculated by combining various possible operating conditions. A fire condition refers to an external fire occurring in a device whose flame height is within 7.62 meters, and it is necessary to calculate the wet surface area of the device. Regarding the leakage rate under fire conditions, it is further divided into cases with insulation and those without it. In cases with insulation, it is necessary to ensure that the insulating material does not burn or fall off within 2 hours, nor does it fall off under the impact of fire water; otherwise, such insulation is considered as having no insulation. GB 150-1998 \"Steel Pressure Vessels\" provides calculations regarding whether insulation is present in the vessel during fire conditions, as well as the discharge volume when the outlet is shut off.