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Nonlinear gasket-based flange bolt pre-tightening load design method

A design method and flange bolt technology, applied in computer-aided design, calculation, special data processing applications, etc., can solve the problems of reducing the rebound performance of gaskets, leakage of flange connection system tightness, increase of flange deflection angle, etc. problem, to achieve the effect of improving safety

Inactive Publication Date: 2017-07-21
WUHAN INSTITUTE OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

Although the flange connection is very practical in disassembly, there is always a potential leakage hazard. Even at normal temperature, if the working pressure and bolt pre-tightening force are not set properly, the rebound performance of the gasket will be reduced, and the stress of the gasket will be reduced. The flange deflection angle increases, and the tightness of the bolted flange connection system will be damaged due to leakage, resulting in accidents

Method used

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  • Nonlinear gasket-based flange bolt pre-tightening load design method
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  • Nonlinear gasket-based flange bolt pre-tightening load design method

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0027] A method for designing the pretightening force of flange bolts based on nonlinear gaskets, comprising the following steps:

[0028] S1. Analyze the compression and rebound performance of the gasket.

[0029] Compression resilience is the basic mechanical property of gaskets. In the pre-tightening stage of the bolted flange connection, the good compression performance of the gasket is the basic condition to ensure the initial sealing between its surface and the flange surface, and the gasket is required to have better resilience during operation, so as to effectively compensate for the operation. The separation of the sealing surface caused by medium pressure, temperature and additional load of the flange under working conditions.

[0030] The compression springback curve of the flexible graphite composite gasket at the stress level of 70Mpa a...

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Abstract

The invention relates to a nonlinear gasket-based flange bolt pre-tightening load design method. The compression resilience performance of a gasket is analyzed; a relationship between unloading performance and bolt pre-tightening force of the gasket is discussed; a flange connection system is subjected to elastic analysis, and the nonlinear performance of a gasket material can enable the bolt pre-tightening force to be nonlinearly changed; a flange connection is subjected to coordination analysis of axial displacement; a law of change of gasket pressing force along with a working pressure and the bolt pre-tightening force is solved; a law of change of a flange deflection angle along with the working pressure and the bolt pre-tightening force is solved; the tightness of the bolt flange connection system is subjected to safety assessment; and a safety region of the nonlinear bolt pre-tightening force of a flange under the condition of a certain nominal pressure is given by integrating two aspects of the gasket pressing force and the flange deflection angle, so that the tightness of the bolt flange system reaches the best. According to the method, a simple and effective quantitative assessment method is given for the tightness of the normal-temperature flange connection system; a basis is provided for design and tightness assessment of the bolt flange connection system; and the safety is improved.

Description

technical field [0001] The invention belongs to the field of flange connection systems, and in particular relates to a method for designing the pretightening load of flange bolts based on nonlinear gaskets. Background technique [0002] In pressure equipment and pipelines, due to the needs of production technology and installation and maintenance, detachable sealed connection structures are usually used. Among them, flange connection is the most typical detachable sealed connection, which is widely used in medium and low pressure vessels and pipelines. Although the flange connection is very practical in disassembly, there is always a potential leakage hazard. Even at normal temperature, if the working pressure and bolt pre-tightening force are not set properly, the rebound performance of the gasket will be reduced, and the stress of the gasket will be reduced. If the flange deflection angle increases, the tightness of the bolted flange connection system will be damaged due t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06
Inventor 郑小涛潘佳琳子喻九阳徐建民王成刚林纬汪威
Owner WUHAN INSTITUTE OF TECHNOLOGY
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