Safety assessment method for high-temperature pressure pipeline with crack type defects

Abstract

The invention discloses a safety assessment method for a high-temperature pressure pipeline with crack type defects. The safety assessment method for the high-temperature pressure pipeline with crack type defects includes steps that 1, gathering data; 2, definitely evaluating the life span; 3, determining load and temperature; 4, analyzing elastic stress; 5, characterizing crack; 6, assessing initial crack leakage and rupture; 7, judging whether the initial crack is safe; 8, judging whether the initial crack is free of creep analysis; 9, calculating reference stress and stress intensity factors; 10, calculating creep rupture life based on the initial crack size; 11, judging whether the creep rupture life is long enough; 12, judging whether the creep is steady creep; 13, calculating steady state creep crack growth; 14, calculating unsteady state creep crack growth; 15, calculating the creep rupture life based on the current crack size; 16, judging whether the current creep rupture life is long enough; 17, assessing the current crack leakage and rupture; 18, refining and evaluating; 19, judging whether the assessed object is safe. The safety assessment method for the high-temperature pressure pipeline with crack type defects can be used for assessing the safety of the high-temperature pressure pipeline with crack type defects under creep load effect.

Description

technical field [0001] The invention relates to a safety assessment method for a high-temperature pressure pipeline with crack-like defects, in particular to a safety assessment method for a high-temperature pressure pipeline with crack-like defects under the action of creep loads. Background technique [0002] Pressure pipelines are pressure-bearing special equipment widely used in petrochemical, electric power, metallurgy, gas and other process industries to transport toxic, flammable, explosive and other dangerous chemicals. These pressure pipelines are usually welded on-site by welding methods, and there are inevitably some defects. These defects may be further expanded after long-term use. Once failure, leakage or explosion occurs, it is often accompanied by catastrophic fires, poisoning, environmental pollution, radioactive pollution, etc. Accidents will seriously affect the safety of people's lives and property, the safe operation of the national economy and social st...

AI Technical Summary

Problems solved by technology

However, for high-temperature pressure pipelines, current domestic research mainly focuses on online detection of high-temperature pressure pipeline defects, online strain monitoring, and ultimate load analysis with local thinning (pit), and no corresponding safety assessment technology has been established for crack defects. method

Images