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Design method for bolt flange connecting structure of homogeneous gasket

A technology for connecting structures and bolted flanges, which is applied in flange connections, mechanical equipment, pipes/pipe joints/fittings, etc. It can solve the problems of ignoring the influence of sealing performance and not fully considering the mechanical and sealing characteristics of connected structural elements. , to achieve the effect of reducing the design workload, avoiding casualties and material and financial losses, and accurately designing the structure

Inactive Publication Date: 2013-02-13
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All these design methods either do not take the leakage rate of the connection structure as the design basis, or do not fully consider the mechanical and sealing characteristics of the connection structure components, and then ignore the influence of the tightness and the characteristics of the gasket itself on the overall sealing performance of the connection structure

Method used

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  • Design method for bolt flange connecting structure of homogeneous gasket
  • Design method for bolt flange connecting structure of homogeneous gasket
  • Design method for bolt flange connecting structure of homogeneous gasket

Examples

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Embodiment

[0041] A pipe is flanged, the inner diameter of the pipe is 200mm, the working pressure is 2.0MPa, the working temperature is 20°C, the internal medium is hydrogen, the connection structure does not bear the action of external bending moment, and the allowable leakage rate is 2×10 -3 cm 3 / (s mm), design a bolted flange connection.

[0042] The design process is as follows.

[0043] ①According to the on-site working conditions and the pipe diameter, PN2.5, DN200 raised-face welded steel pipe flanges are initially selected for the flange, which conforms to the GB / T 9115.1-2000 standard, and the material is 20# steel; 12 M24 bolts are used , stud bolts made of 35CrMo, gaskets made of asbestos rubber sheet gaskets, the size is According to the standard calculation, the preload of each bolt is 206kN.

[0044] ② When the connection structure does not bear external bending moment, the maximum stress S of the gasket is obtained from the deformation coordination equation Gmax is ...

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Abstract

The invention discloses a design method for a bolt flange connecting structure of a homogeneous gasket, belonging to the technical field of sealing. The gaskets are used as important sealing elements in bolt flange connection, wherein the gaskets are divided into homogeneous gaskets and non-homogeneous gaskets according to structural styles. As such factors as conquassation and stress redistribution of the homogeneous gasket are not taken into consideration in the conventional design method, the invention discloses a design method for a bolt flange connecting structure using a homogeneous gasket as a sealing element by taking such factors as tightness, additional bending moment and gasket conquassation limit of the designed connecting structure into consideration while the bolt flange connecting structure uses the homogeneous gasket as the sealing element; moreover, a calculation example is given to verify the experiment. The design method has the characteristics of simple calculation method and high accuracy, so that not only the design workload can be reduced, but also the design efficiency can be improved; besides, the design method can effectively reduce resource waste during the using process of the bolt flange connecting structure, can avoid terrible accidents, casualties and material and financial resource loss, and is of very important practical significance.

Description

Technical field [0001] The invention relates to a design method of a bolted flange connection structure using a homogeneous gasket as a sealing element. 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. Its failure mode is leakage and strength failure, and leakage is the main failure mode. [0003] As a key component of the bolted flange connection structure, the gasket plays a vital role in the tightness of the bolted flange connection structure. According to the material and structure of the gasket, the gasket can be divided into homogeneous gasket and non-homogeneous gasket: homogeneous gasket means that the material of the overall structure of the gasket is composed of uniform material from the inner diameter to the outer diameter, such as Non-asbestos rubber plate gaskets, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L23/18
Inventor 刘麟张锁龙宋敏霞王冲廖坤
Owner CHANGZHOU UNIV
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