Detection method of fixed pressure vessel

A pressure vessel and detection method technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as unfixed pressure vessel judgment, and achieve the effect of accurate calculation methods

Active Publication Date: 2019-04-09
张磊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Detection method of fixed pressure vessel
  • Detection method of fixed pressure vessel
  • Detection method of fixed pressure vessel

Examples

Experimental program
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Effect test

Embodiment 1

[0045] For a petroleum storage tank made of 16MnR steel, its diameter is 7m, and the measured actual average wall thickness is 30mm. For detection, the specific steps are as follows:

[0046] Measure the inner diameter R of the pressure vessel, the allowable stress amplitude of the pressure vessel wall material at the service temperature and the weld coefficient α of the pressure vessel, use the formula (1) to calculate the theoretically thinnest allowable wall thickness of the pressure vessel:

[0047]

[0048] In the formula, D 1Indicates the theoretically thinnest allowable wall thickness of the pressure vessel, P is the maximum bearing pressure of the pressure vessel;

[0049] Substituting relevant parameters, the thinnest allowable wall thickness is 20.6mm. Since 20.6mm<0.8*30mm, proceed to step 3, scan the entire wall of the pressure vessel by ultrasonic measurement, determine existing defects, and locate all defects and mark it;

[0050] Step 4: Perform ultrason...

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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....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01B17/00
CPCG01B17/00G01N29/048
Inventor 张磊
Owner 张磊
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