IX Sealing Rings
IX Seal Rings are designed and used where NORSOK
CFC(Compact Flange Connections) are in use.The rings come in
three different kinds of steel and are coated with PTFE in varying
colors in order to distinguish between them
(Standard identification NORSOK) The designed or materials
shall be selected, so that main sealing ares can not be subject to
corrosion.
How IX Ring Seal Works
IX Seal Ring axial forces are exerted on the taper of the metal seal ring and translated into a
radial sealing force. Furthermore with increased pre-load, the bevel is closed and face to face
contact is achieved at the outer wedge while most of the bolt pre-load is transferred as
compressive forces between the flange faces at the heel. There are two independent seals. The
first seal is created by application of seal seating stress at the flange heel. The flange also
remains in contact along it`s outer circumference at the flange faces for all allowable load
levels. The main seal is the IX Seal Ring. The seal ring force is provided by the elastic stored
energy in the stressed seal ring. Any hell leakage will give internal pressure acting on the seal
ring inside intensifying the sealing action. The design aims at preventing exposure to oxygen
and other corrosive agents. Thus, this prevents corrosion of the flange faces, the stressed
length of the bolts and the seal ring.
Typical Seal Ring Materials
Typical minimum yield stress and ultimate stress of the seal ring material shall at maximum
design temperature be 300MPa and 360MPa, respectively, in order to allow for reasonably
elastic spring-back. Lower strength may be used, but is not recommended.
The user is responsible for selecting a seal ring material which is suitable for the service
medium and the design temperature conditions. Seal ring materials are commonly chosen to
be compatible with the flange material.