Prediction method of leakage rate of bolted flange connection structure

A technology of bolted flange and connection structure, which is applied in the field of accurate prediction of leakage rate, and can solve problems such as strength evaluation and inability to predict leakage rate.

Inactive Publication Date: 2012-06-27
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem solved by the present invention is to overcome the shortcomings of the traditional bolted flange connection structure design method that its strength can only be evaluated and its leakage ra

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  • Prediction method of leakage rate of bolted flange connection structure
  • Prediction method of leakage rate of bolted flange connection structure
  • Prediction method of leakage rate of bolted flange connection structure

Examples

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Example Embodiment

[0065] Example

[0066] A material inlet and outlet pipe of a platinum reformer reactor of a petrochemical enterprise is connected with flanges. The working pressure is 1.19MPa, the working temperature is 543℃, and the medium is a mixture of hydrogen and hydrocarbons. The flange is a NPS30Class150 necked butt welding flange that meets the ANSI B16.47 standard. The inner diameter of the sealing surface is 720mm, and the outer diameter of the sealing surface is 858mm. The material is 10CrMo910; the bolts are standard stud bolts that comply with ANSI N18.2.1a. Size NPS1-3 / 4, quantity is 28, material is 25Cr2MoVA; gasket is stainless steel flexible graphite spiral wound gasket that meets ASME B16.20a standard. Nominal gasket size NPS30, outer diameter D o =846mm, inner diameter D i =794mm, preload specific pressure y=70MPa, gasket coefficient m=3.0.

[0067] At working temperature, the basic performance of stainless steel flexible graphite wound gasket is:

[0068] Compression characte...

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Abstract

The invention relates to a prediction method of a leakage rate of a bolted flange connection structure, and belongs to the technical field of sealing. A gasket is an important sealing element in bolted flange connection, and the tightness width of the gasket is a key factor which determines the sealing performance of the connection structure. In order to solving the defects that the leakage rate of the connection structure can not be predicted in the traditional bolted flange standard design method, and under the conditions that the connection structure bears an external load, and high temperature and pressure and temperature and pressure have greater fluctuation, and the like, the predication is inaccurate in the traditional predication method of the leakage rate, so the prediction method of the leakage rate of the bolted flange connection structure is provided according to the relationship among the calculated tightness width of the gasket and the material of the gasket, the connection form of the connection structure, the load, working conditions and the like, and a numerical example and experimental verification are provided. The predication method has the characteristics of simple calculation method and high accuracy, and the leakage rate of the bolted flange connection structure can be accurately predicated under different working conditions according to the calculation method, and thus the security, stability and long-period operation of process equipment are ensured.

Description

Technical field [0001] The invention relates to a method for accurately predicting the leakage rate of a bolted flange connection structure under different working conditions. It belongs to the field of sealing technology. Background technique [0002] Bolted flange connection is widely used in industry, agriculture, national defense and daily life. It is the most important connection form in process industry equipment, and its failure mode is mainly manifested as leakage. [0003] In the early 1980s, PVRC proposed a bolted flange connection experimental research program, by adopting a new gasket coefficient G based on tightness b , a and G s to replace the traditional m, y coefficients. [0004] ASME VIII-1 "Code for Boiler and Pressure Vessels" and my country's GB150 "Steel Pressure Vessels" in the design method of bolted flange connection are based on strength design. Although the ASME standard introduces the gasket coefficient G based on tightness b , a and G s , wh...

Claims

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Application Information

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IPC IPC(8): G01M3/00
Inventor 刘麟张锁龙宋敏霞
Owner CHANGZHOU UNIV
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