Quantitative risk analysis method of pressure bearing equipment containing surface crack defects

Abstract

The invention discloses a quantitative risk analysis method of pressure bearing equipment containing surface crack defects. The method comprises the following steps of: 1) carrying out non-destructive inspection on pressure bearing equipment to be analyzed; 2) calculating a stress strength factor KI of the pressure bearing equipment containing surface crack defects; 3) calculating plastic fracture degree Lr of the pressure bearing equipment; 4) calculating fracture failure degree Kr' of the pressure bearing equipment; 5) establishing a failure equation, substituting the Lr value and Kr' value into the equation, and carrying out calculation according to a formula Z=Kr'-(1-0.14Lr2)(0.3+0.7exp(-0.65Lr6); 6) calculating failure probability including surface cracks by using a Monte-Carlo method; and 7) determining a correction factor FD including surface crack defects and calculating failure probability of the pressure bearing equipment. According to the invention, the influences of the surface crack defects on the pressure bearing equipment are taken into consideration, the accuracy of risk analysis result is improved and the the pressure bearing equipment is inspected and maintained in a more target and more reasonable way.

Description

technical field [0001] The invention relates to the field of risk analysis of pressure equipment, and relates to a method for quantitative risk analysis of pressure equipment with surface crack defects. Background technique [0002] Pressure-bearing equipment refers to equipment with fluid pressure as the basic load, such as pressure vessels, pressure pipes, pressure boilers, and pressure-bearing accessories. With the advancement of science and technology and the development of industrial production, the use of pressure equipment is becoming more and more extensive. At present, pressure equipment has become the chemical industry, petroleum industry and petrochemical industry, coal, metallurgy, atomic energy, aerospace, marine engineering, light industry, Important equipment in various departments such as textiles, food, and urban construction not only affects the development of the national economy, but also has potential dangers. Once an accident occurs, it often causes ser...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the impact of surface crack defects is ignored when using risk inspection-based standards for risk analysis in the use of pressure-bearing equipment in the prior art, and the risk assessment of pressure

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