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Overall airtightness detection method for pressure vessel

A technology for air tightness testing and pressure vessels, which is applied in liquid tightness measurement using liquid/vacuum degree, testing of machine/structural components, fluid tightness testing, etc. , time-consuming problems in the test process, etc., to achieve accurate and reliable judgment results, save the cost of measuring devices and measurement time, and make the measuring devices and implementation steps simple and common.

Active Publication Date: 2021-04-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, due to the problems mentioned above, the measurement results of the pressure drop method are difficult to distinguish, and the test process takes a long time; the bubble method and mass spectrometry are limited by the volume requirements of the pressure vessel, and their applicability is limited.

Method used

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  • Overall airtightness detection method for pressure vessel
  • Overall airtightness detection method for pressure vessel
  • Overall airtightness detection method for pressure vessel

Examples

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Effect test

Embodiment 1

[0046] When the pressure vessel can be equipped with a temperature detection point, combined with figure 1 and figure 2 As shown, as a specific embodiment of the present invention, a method for detecting the overall airtightness of a pressure vessel includes:

[0047] Through the pressure gauge and thermocouple, obtain the time t of the pressure vessel at the completion of the boost max The corresponding maximum pressure value p max and the maximum temperature T max ;

[0048] According to the maximum pressure value p max and the maximum temperature T max , use the Refprop9.0_NIST physical property query software to determine the gas density ρ in the pressure vessel g , that is, ρ g =f(p max ,T max );

[0049] Through the pressure gauge and thermocouple, obtain the pressure vessel at the detection time t 1 Corresponding actual pressure value p 1 and the actual temperature value T 1 ;

[0050] According to the gas density ρ g and the actual temperature value T ...

Embodiment 2

[0054] When the pressure vessel cannot be equipped with temperature measuring points, first assume that the pressure vessel has good airtightness, and obtain the change law of pressure with time according to the pressure measurement data at different times, and obtain the theory at any time according to the change law of pressure with time Finally, compare the theoretical pressure value with the actual pressure measurement value of the detection point to verify the airtightness of the pressure vessel, as follows:

[0055] to combine figure 1 and image 3 As shown, as a specific embodiment of the present invention, a method for detecting the overall airtightness of a pressure vessel includes:

[0056] Through the pressure gauge, obtain the boosting completion time t of the pressure vessel max and at the boost completion time t max The corresponding maximum pressure value p max .

[0057] Obtain the first moment t of the pressure vessel during the pressure holding process t...

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Abstract

The invention discloses an overall air tightness detection method for a pressure vessel. The method comprises the following steps: acquiring a maximum pressure value pmax and a maximum temperature value Tmax corresponding to a boosting completion moment tmax of the pressure vessel; determining the gas density [rho]g in the pressure vessel according to the maximum pressure value pmax and the maximum temperature value Tmax; obtaining an actual pressure value p1 and an actual temperature value T1 corresponding to the pressure vessel at the detection moment t1; determining a theoretical pressure value pc corresponding to the pressure vessel at the detection moment t1 according to the gas density [rho]g and the actual temperature value T1; comparing the actual pressure value p1 with the theoretical pressure value pc, and when the actual pressure value p1 is smaller than the theoretical pressure value pc, determining that a leakage problem exists in the pressure vessel; and when the actual pressure value p1 is equal to the theoretical pressure value pc, determining that the air tightness of the pressure vessel is good. According to the invention, the overall air tightness of the pressure vessel can be detected more accurately.

Description

technical field [0001] The invention belongs to the field of airtightness detection of pressure vessels, and in particular relates to an overall airtightness detection method of pressure vessels. Background technique [0002] For pressure vessels, leak detection is an important link before they are put into use. During the equipment manufacturing process, connection problems such as flanges and threads, or welding problems such as incomplete penetration, pores, and cracks often lead to leakage of pressure vessels. Leak detection generally includes hydraulic test and air tightness test, and the air tightness test should be carried out after the hydraulic test is passed. For pressure vessels whose medium is extremely toxic, highly hazardous, or designed to not allow a small amount of leakage, an airtightness test must be carried out. [0003] Compared with the hydraulic test detection method, the air tightness detection has the problems of being difficult to identify and qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/32
CPCG01M3/3272
Inventor 李会雄常福城王乐乐产文李熙
Owner XI AN JIAOTONG UNIV
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