A detection method for a fixed pressure vessel

Abstract

The invention relates to a detection method of a fixed pressure vessel. According to the method, a theoretical thinnest allowable wall thickness D1 of the pressure vessel is calculated firstly; a thickness tester is used for carrying out thickness test on the fixed pressure vessel and calculating an average practical wall thickness D2 of the vessel; the average practical wall thickness D2 is compared with the thinnest allowable wall thickness D1 to judge the safety condition of the vessel; if the vessel is safe, an ultrasonic measurement method is further used for carrying out full wall surface scanning on the pressure vessel so as to determine existing defects; all the defects are positioned and marked; ultrasonic time difference diffraction detection is carried out on the positions withdefects to obtain lengths and heights of the defects; a simulated size is calculated according to the lengths and heights of the defects; a maximum crack of the simulated size is screened; the maximumsimulated size D3 of the defects is compared with the average practical wall thickness D2; and for the safe vessel, crack propagation speed and residue life prediction is further carried out througha Paris formula. The method is capable of providing important basis for predicting safety performance of the fixed pressure vessel and preventing the generation of leakage or explosion accidents.

Description

technical field [0001] The present invention relates to a detection method of a pressure vessel, more specifically, to a non-destructive detection method of a fixed pressure vessel. Background technique [0002] A pressure vessel is a special pressure-bearing equipment with a risk of explosion. It is often used to store flammable, explosive and toxic liquids, gases, etc. Once it explodes or leaks, the consequences will be extremely serious. In recent years, with the continuous development of my country's modern industry, more stringent requirements have been put forward for the product quality, structural safety, and reliability of use of pressure vessels. The safety and reliability evaluation of fixed pressure vessels is particularly important. During the application period, under the influence of temperature, medium, pressure and other factors, various damages will gradually appear on the fixed pressure vessel, and the problem of stress concentration is very easy to occur....

AI Technical Summary

Problems solved by technology

These existing technologies cannot quickly judge the defects of fixed pressure vessels, and cannot further provide specific and detailed comprehensive judgment criteria

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