IX Seal Ring

At Kriloha Ltd., we recognize that the future of offshore engineering is “Compact.” In the punishing environment of the North Sea and deepwater basins, every kilogram of steel and every centimeter of space saved translates to massive cost efficiencies. The Kriloha IX Seal Ring is the core component of the NORSOK compact flange system. As a premier global supplier of high-performance rubber seals and gaskets, Kriloha Gaskets manufactures IX rings with the extreme dimensional precision required for these high-integrity joints.

The IX Seal Ring is fundamentally different from a standard R-series gasket. It is designed to be installed in a Compact Flange, which features a slightly convex face. When the bolts are tightened, the flange faces meet first at the outer diameter and then “close” toward the center. The IX ring sits in a precision-machined groove and is compressed during this closing process. It features a “Heel” (the outer edge) and a “Toe” (the inner edge). The initial seal is created by the mechanical force of the bolts, but the primary long-term seal is pressure-energized. As fluid enters the joint, it forces the lips of the IX ring outward, creating a gas-tight, metal-to-metal barrier.

Manufacturing a Kriloha IX Seal Ring requires metallurgical mastery. Because these rings are often used in “Sour Service” (H2S) or with highly corrosive seawater, we utilize vacuum-annealed Super Duplex or Nickel Alloys. We ensure that the surface finish is polished to a mirror-like Ra 0.8 μm, ensuring that there are no microscopic leak paths. One of the critical technical advantages of the Kriloha IX ring is its ability to handle “Bending Moments.” In offshore piping, waves and currents cause pipes to flex; the IX ring is designed to stay energized even as the flange faces undergo slight mechanical stress.

By choosing Kriloha Ltd., you are investing in a “Fit-and-Forget” technology. Our IX rings are often supplied with specialized PTFE or MoS2 (Molybdenum Disulfide) coatings to reduce friction during installation and prevent galling. Whether you are building a subsea template or an offshore production module, Kriloha IX Seal Rings provide the high-pressure stamina and space-saving efficiency required for modern maritime engineering.

Primary Use Cases

Offshore Oil & Gas Platforms: The standard for topside and subsea piping where weight and space savings are critical.
Subsea Production Systems: Providing a high-reliability, maintenance-free seal for underwater manifolds and flowlines.
High-Pressure Gas Injection: Managing extreme pressures in gas lift and secondary recovery systems.
Chemical Processing Modules: Used in modular plant construction where compact footprints are required.
FPSO (Floating Production Storage and Offloading): Ideal for the high-vibration and space-constrained environments of offshore vessels.

FAQs

Can I use an IX Seal Ring in a standard ASME flange?

No. IX Seal Rings are specifically designed for Compact Flanges (NORSOK L-005). They will not fit into the trapezoidal grooves of standard ASME B16.5 or API 6A flanges.

What is the benefit of a Compact Flange with an IX ring?

A compact flange assembly is typically 70% to 80% lighter than a standard flange of the same pressure rating. The IX ring ensures this lighter assembly maintains a higher sealing integrity, even under bending loads.

Are IX rings reusable?

According to NORSOK standards, the IX ring should be replaced whenever the flange is disassembled. Because the seal relies on precise metal-to-metal interference, a used ring may have lost the necessary “spring-back” to re-seal.

What does “Pressure-Energized” mean for an IX ring?

It means the shape of the ring allows the internal pipe pressure to actually push the seal against the flange more firmly. The higher the internal pressure, the tighter the seal becomes.

How do I prevent corrosion on an IX ring?

Kriloha recommends manufacturing IX rings from materials that match or exceed the pipe’s corrosion resistance (e.g., Duplex or Inconel). We also provide specialized coatings to prevent crevice corrosion in the flange groove.