Method for assessing safety of pressure bearing apparatus after fire hazard

Abstract

The invention belongs to the field of the safety assessment of pressure bearing apparatuses, and concretely relates to a method for assessing the safety of a pressure bearing apparatus based on damage thermal stimulation. The method concretely comprises the following steps: carrying out onsite examination of the hardness and the metallographic phase; carrying out a thermal simulation experiment to obtain the hardness and the metallographic structure critical value; comparing the onsite examination measure values of the hardness and the metallographic phase with the metallographic structure critical value and a normal value, carrying out a next step if conditions are satisfied, and directly discarding if the conditions are not satisfied; carrying out macroscopic inspection and nondestructive detection: determining a standard exceeding defect, directly carrying out strength check if there is no standard exceeding defect, and carrying out fracture and fatigue evaluation if there is a standard exceeding defect; and determining an allowed work condition after the strength check and fracture and fatigue evaluation are qualified, afresh allowing the apparatus to run, and directly discarding or maintaining if the strength check and fracture and fatigue evaluation are unqualified. The method has a high evaluation efficiency, and can rapidly and effectively evaluate whether the pressure bearing apparatus subjected to the fire hazard can be used or not.

Description

technical field [0001] The invention belongs to the field of safety assessment of pressure equipment, and in particular relates to a safety assessment method for pressure equipment after fire based on damage thermal simulation. Background technique [0002] Pressure equipment is widely used in petrochemical, electric power, metallurgy, gas, aerospace and other pillar fields of the national economy. Pressure-bearing equipment generally faces the threat of high pressure, high temperature, low temperature, flammable, explosive, toxic and other media. Once leakage or explosion occurs, it is often accompanied by catastrophic accidents such as fire, explosion, poisoning, environmental pollution, and radioactive pollution. Social, economic, production and people's lives bring losses and harm, directly affecting social security. [0003] There are two main cases of overfire in pressure equipment, one is due to overheating caused by operating conditions and process fluctuations duri...

AI Technical Summary

Problems solved by technology

API579’s suitability evaluation process for fire and pressure equipment is very complicated and does not conform to the national conditions of our country. On-the-spot sampling, and then test the samples in the laboratory, which not only damages the pressure-bearing equipment, but also cannot systematically study the influence of factors such as heat exposure temperature, heat exposure time, and cooling rate on the mechanical properties and microstructure of materials

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