Predicting method of leakage rate of bolted flange connection structure with anti-loosing washer

A bolted flange and connection structure technology is applied in the field of leakage rate prediction of bolted flange connection structures, which can solve problems such as unpredictable leakage rate.

Inactive Publication Date: 2010-03-10
NANJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0012] The technical problem to be solved by the present invention is, aiming at the defect that the leakage rate of the existing bolted flange connection structure with anti-loosening washers cannot be predicted, by establishing the deformation coordination equation of the bolted flange connection with anti-loos

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  • Predicting method of leakage rate of bolted flange connection structure with anti-loosing washer
  • Predicting method of leakage rate of bolted flange connection structure with anti-loosing washer
  • Predicting method of leakage rate of bolted flange connection structure with anti-loosing washer

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Embodiment

[0071] The pipeline is bolted and flanged, the working pressure is 3.88MPa, the working temperature is 500°C, and the medium is hydrogen, hydrogen sulfide gas and hydrocarbon mixture. The connecting flange is a concave-convex face-to-face welded steel pipe flange in accordance with GB / T 9115.2-2000 standard, PN16, DN200, and the material is 0Cr18Ni9; the connecting element is 12 M33 studs, and the material is 25Cr2MoVA; the sealing gasket Spiral wound gasket for flexible graphite Refer to the relevant provisions of GB150-1998 to take the pre-tightening stress of the gasket as 70MPa; 24 anti-loosening washers, and its structural parameters are: inner diameter D 1 =34mm, outer diameter D 2 =75mm, thickness S=6.5mm, washer inclination α=7°.

[0072] When the working temperature is 500°C, the basic properties of the flexible graphite wound gasket are:

[0073] Compression performance: S K = 38.7 D ...

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Abstract

The invention relates to a predicting method of the leakage rate of a bolted flange connection structure with an anti-loosing washer. Aiming at the defect that the leakage rate of the prior bolted flange connection structure with the anti-loosing washer can not be predicted, by establishing the deformation compatibility equation of the bolted flange connection with the anti-loosing washer and calculating the pretightening force and the working stress of a gasket, and according to the tightness principle, the predicting method of the leakage rate of the bolted flange connection structure with the anti-loosing washer is established, so that the prediction of the leakage rate of the connection structure is realized. The predicting method of the invention has simple calculation principle and method and accurate prediction result, and can be widely applied to the prediction and calculation of the leakage rate of the connection structure in the circumstance of high temperature and high pressure and larger fluctuation of temperature and pressure.

Description

technical field [0001] The invention relates to gasket sealing technology, in particular to a method for predicting the leakage rate of a bolted flange connection structure with an anti-loosening washer. Background technique [0002] Bolt flange gasket seals are widely used in equipment and pipeline connections in the process industry. The failure of the connection structure is rarely caused by insufficient strength, and leakage is the main cause of failure. Especially under high temperature conditions, due to the deterioration of the performance of the gasket, coupled with the elongation of the bolt and the deflection of the flange under the combined action of medium pressure and temperature, the compression stress of the gasket caused by the relative separation tendency between the flange sealing surface and the gasket It is more likely to cause the sealing performance of the connection system to decrease or even cause leakage. [0003] In the bolted flange connection sys...

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Application Information

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IPC IPC(8): G06F19/00G01M3/00
Inventor 顾伯勤周剑锋刘麟陈晔邵春雷陆晓峰黄星路张育朱瑞松孙振国
Owner NANJING UNIV OF TECH
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