Visualisation Of The Real Contact Area At
Gasket Surfaces Using Thin PC Films
Author(s)
I. Nitta & Y. Matsuzaki
Abstract
Leakage rates and real contact areas of the seal surfaces were measured under
several closing loads. The static seal consisted of a ring-shaped copper gasket
and the two carbon steel flanges, the surfaces of which were finished on a lathe.
With increasing closing load, the leakage flow in the radial direction ceased and
only that in the circumferential direction remained. To determine the closing load
at which radial leakage flow ceases, it is necessary to determine the real contact
conditions on the gasket surface. In the present study, the real contact area
between the copper gasket and the steel flange was measured using a thin
polymer film 1 µm in thickness. The contact pressure over which the radial
leakage ceased could be predicted from observations of the thin polymer film. In
addition, the cross-section of the channel for leakage flow in the circumferential
direction was evaluated from the measured real contact area, and the leakage
rates were estimated by assumption of laminar flow. The results agreed well with
the measured leakage rates.
Keywords: tribology, coupling, flat metallic gasket, leakage, thin polymer film,
real contact area, surface roughness, gas leak test.
1 Introduction
Solid metal flat ring gaskets are used extensively in industry where, depending
on the process medium, temperature, pressure and/or allowable leakage rate, soft
materials (or combination gaskets consisting of soft material with metal) cannot
be used. It is difficult to estimate leakage rates accurately, as both the flanges and
)
Keywords
tribology, coupling, flat metallic gasket, leakage, thin polymer film,
real contact area, surface roughness, gas leak test.
Related Book
Other papers in this volume
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