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Metropolis Reality Forums « High pressure flange bolt seal design with gasket »

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   Author  Topic: High pressure flange bolt seal design with gasket  (Read 136 times)
qizhen0926
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High pressure flange bolt seal design with gasket
« on: Nov 21st, 2017, 7:50pm »		 Quote Quote Modify Modify Remove Remove
In order to design failure prevention of high pressure large diameter flange seal, from the factors affecting the effect of flange sealing gasket gasket characteristics and stress inhomogeneous 2 parameters; coefficient to the gasket and gasket preload than pressure based on Characteristic Analysis of ratio and coefficients of the 2 new concepts reflect the combination of characteristics of the pad; the structure and material performance of gasket gasket characterization of safety coefficient under different calculation under the pressure of safety. A typical safety factor curve is drawn, and the safety factor decreases with the increase of the calculation pressure, and there is a single inflection point in the curve decline; the applied pressure of the gasket is greater than the inflection point pressure, which is less than the calculation pressure when the gasket safety factor is equal to 1. The sealing design of the sealing structure can be guaranteed by applying various gaskets to the corresponding design values under different safety factors.§ª§ß§Õ§Ú§Ó§Ú§Õ§å§Ñ§Ý§î§ß§í§Ö §Þ§Ñ§Ý§Ö§ß§î§Ü§Ú§Ö §ä§à§ß§Ü§Ú§Ö §á§Ý§Ö§ß§Ü§Ú PVD §Ó§Ñ§Ü§å§å§Þ§ß§à§Ô§à §ß§Ñ§á§í§Ý§Ö§ß§Ú§ñ §á§à§Ü§â§í§ä§Ú§Ö §Þ§Ñ§ê§Ú§ß§í
Flange bolt forced compression gasket seal is a widely used sealing form in petrochemical equipment (as shown in Figure 1). With the large equipment and complex working conditions, a large number of flange sealing failures caused by gasket have appeared in the project. The different conditions based on the reliability of Xu bolt gasket sealing in pressure vessel static strength safety coefficient is analyzed, but not related to the safety coefficient of gasket; literature only analysis the reliability of parameters of gaskets of metal skeleton structure, the result is not applicable to other design factors and gasket structure; the manufacturing factors respectively from the face of high pressure bolt sealing failure analysis, no analysis of gasket in-depth literature respectively; quality problems of wave tooth composite graphite metal pad and the technical countermeasures were studied; the literature suggests that the gasket coefficient m and gasket preload than pressure y value of the 2 parameter values generally very low, the bolt load calculation is the design load, and the load applied is usually the design value of 2 ~ 3 times, to a certain extent complement Compensate for the lack of design. The paper points out the problem of flange design with Waters method, but does not involve the gasket design in the sealing system.
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At present, the vast majority of manufacturers only rely on experience to design gaskets, lack of scientific theoretical basis, resulting in a significant difference in gasket performance, product safety and reliability can not be guaranteed. In the long-term practice of failure of pressure equipment in the control of mechanical design, introduced a series of safety factor, but the gasket design as the main application of safety factor is still a blank, the vacuum technology network that has important engineering significance to research on the safety coefficient of the gasket.
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