Abstract
Abstract The paper presents a new design of semimetal gasket, which has been subjected to the optimization process. The main objective function was to achieve the maximum elastic recovery of the gasket at imposed functional and strength limitations. The objective function was described indirectly in the form of the required minimum angle of the gasket’s unload curve inclination, which was a measure of the average value of the elastic modulus at unloading. Strength limitations resulted from not exceeding the ultimate stress of the materials, while functional limitations imposed the achievement of proper contact pressure that ensures a given level of tightness class. The characteristic dimensions describing the cross-section of the gasket’s core were described by five descriptive parameters. As a result of the interrelationship of these parameters, 210 construction models were created that were subjected to compression simulations. This problem was solved using the Finite Element Method. The variant of the gasket fulfilling the imposed limitations and the required minimum objective function was tested experimentally.
Highlights
The condition for a proper function of any pressure installation is that the medium stored in tanks or transported in pipelines cannot get out of them
The paper presents a new design of semimetal gasket, which has been subjected to the optimization process
The objective function was described indirectly in the form of the required minimum angle of the gasket’s unload curve inclination, which was a measure of the average value of the elastic modulus at unloading
Summary
The condition for a proper function of any pressure installation is that the medium stored in tanks or transported in pipelines cannot get out of them. Each pressure installation has a defined acceptable level of leakage or, which is a more precise definition, can operate at a permissible tightness class. The tightness class defines the permissible leakage level of the sealed medium, referred to as the nominal dimension of the gasket. In accordance with the EN 13555 standard, three basic tightness classes have been defined in pressure installations: L1.0, L0.1 and L0.01. A flange-bolted joint is the most popular sealing node in many pressure installations. The most popular solutions of the gaskets used in medium and high-pressure installations are the so-called semimetal gaskets. This work analyzes the construction of a new solution for the semimetal gasket The purpose of this analysis was to determine an optimal shape of the metal core, which will translate into maintaining a high level of tightness class
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