Well Head Ring Gasket
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R octagonal gasket refers to the metal gasket of octagonal-shaped section by processing metal materials.
It is of pressure energized seal in radial direction. The
average diameter of the gasket is slightly larger than the average diameter
of the gasket groove. The angle between ring gasket and bevel face of gasket
groove is around 23o. It has good sealing as the contact between gasket and the
ring joint faces, especially the outside face, and is pressed tightly to keep
good sealing performance.
The octagonal metal ring gasket is installed inside the ring joint groove of flange face. When the connecting bolt
is fastened, it is compressed in axis direction and is pressed close to the
upper and lower ring joint grooves, which result in the plastic deformation to
create the seal. After pressure is raised, the ring gasket expands in radial
direction under the force of media pressure. The gasket sticks more tightly to
the bevel face of ring joint groove to form self-tightening. However, the rise
of media pressure will deform the flange and connecting bolt, it will cause the
relative separation between the sealing surfaces, and the sealing ratio of
gaskets is reduced accordingly. So the metal ring gasket is regarded as
semi-pressure energized ring gasket.
of 'R' Steel Ring and Flange as follows
1.R octagonal ring gasket is the type of mechanical compression, that
is to say it is sealed only by the tightening torque of flanged bolt;
2.R octagonal ring gasket is used
in 6B flanges, with standard flanged connections and line seal, and it is easy
for storage and transport;
3.R octagonal ring gasket can be used interchangeably with R oval ring
gasket and RX ring gasket;
4.R octagonal ring gasket can be
reused in the field in the case of the appearance with
5.The hardness of R octagonal ring gasket must be15~20HB lower than the mating
flange face hardness;
6.The seal faces of R octagonal ring gasket, including the bevel faces, shouldn't have
the scratches, knock marks,cracks and defects. Its surface roughness shouldn't
be larger than Ra1.6.