Standard Gasket Research Articles

Design method of enhancing the tightness of a spiral wound gasket with PTFE filling

The paper presents the experimental research results and numerical computations of two constructions of a spiral wound gasket with a PTFE filling. The first construction was a standard one in which the shape of the spiral’s windings in a cross section view resembles the shape of the letter ‘V.’ The second solution has an original, asymmetric shape of windings’ profile. Based on the vast experimental research tests, it was proved that the gasket with an asymmetric shape of windings is characterized with larger stiffness than the standard design, as well as increased tightness. Numerical calculations and a topography analysis of the contact surface of the gaskets showed that the asymmetric gasket under load is characterized with a larger effective contact surface when compared to the standard gasket. The gasket of an asymmetric construction can have a special application at small contact stress, which allows to avoid an excessive stress of flanges and bolts.

Analysis of sealing performance of a kind of profiled rubber gasket used in the radial contact seal structure

Sealing performance of standard rubber gaskets in the radial contact seal structure are observed through the experiment. A kind of profiled rubber gasket is proposed to replace the standard gasket. Leakage experiment and numerical simulation are carried out to study the sealing performance and failure mode of the profiled gasket. Several equations are presented to help analyze the failure reason. Results show that sealing performance of the profiled rubber gasket is more reliable than that of the standard rubber gasket. The failure reason of the profiled rubber gasket is that the friction force between the gasket external face and tube wall cannot balance the tube internal pressure. Dimension precision of the metal compressive ring has a great effect on the failure pressure.

The elastic serrated gasket of the flange bolted joints

The paper presents the experimental as well as numerical research of a bolted flange joint with an elastic serrated gasket. Two constructions of a metal core were proposed. Their cross-section shapes were different in relation to the standard solution. Results of the experimental research showed that the elastic core provides a considerable increase of the joint tightness compared to the tightness of the joint sealed with a standard gasket. Next, numerical analysis was conducted whose aim was to determine contact pressure on the interfacing surface between the gasket and flange. It appeared that proper forming of the core cross-section provides quite regular distribution of contact pressure along the gasket width. The final part verified the numerical computation and explains the effect of the increased tightness of the joint with an elastic core.

Improving performance of fibre-based gaskets at elevated temperatures – the sandwich approach

The type and quantity of the constituent parts primarily dictate the property profile of a sheet gasket. In a compressed fibre material there are at least 20 types of raw materials, and hence the main focus for innovation surrounds material developments and formulations. Less focus is placed on development of the manufacturing processes. A novel material concept for compressed fibre materials is presented here which significantly decelerates the ageing of elastomer-bound gasket materials by the use of special elastomers and an adapted material structure, the Multi-Layer Structure. Steam testing, as opposed to standard gasket testing, has been used to demonstrate this improvement.

On peculiarities of plastic loosening of gasket materials at pressure generation by diamond anvil technique

Abstract In this paper standard gasket materials are studied to estimate the plastic loosening intensity at the deformation centre during uniaxial compression in the diamond-anvil high-pressure apparatus using the mathematical model of plastic yield and stress-strain state parameters of metallic gaskets.