HX Seal Ring (Pressure-Energized)

At Kriloha Ltd., we understand that as global energy demands push equipment into deeper waters and higher temperatures, the “static” seal is no longer enough. The modern industrial landscape requires a seal that can adapt. The Kriloha HX Seal Ring is our answer to the challenges of dynamic pressure and thermal fatigue. As the top supplier of high-performance rubber seals and gaskets, Kriloha Gaskets has engineered the HX series to be the most resilient metal-to-metal seal in our portfolio.

The HX Seal Ring is a masterclass in “Active Sealing” architecture. While it shares the same footprint as the standard R and RX series, its internal geometry is far more sophisticated. The “H” profile consists of two flexible sealing lips connected by a central bridge. When installed, the lips make initial interference contact with the flange groove walls. As the system is pressurized, the fluid enters the cavity of the “H” and pushes the lips outward against the groove. This pressure-energized effect means that the sealing force increases in direct proportion to the internal pressure, ensuring a fail-safe barrier at the highest operating limits.

Manufacturing a Kriloha HX ring requires metallurgical precision that few can match. Because the lips must flex to achieve their energizing effect, the material must possess a perfect balance of yield strength and ductility. At Kriloha, we utilize Single-Source Forgings and precision vacuum-annealing to ensure the gasket always remains softer than the flange face. This prevents “coining” of the expensive flange grooves while ensuring the HX ring has the “spring-back” memory to recover during thermal expansion or contraction.

By choosing Kriloha Ltd., you are investing in a technology designed for the most extreme “Bad Actor” joints. Our HX rings are available in a variety of high-spec materials, including 316L Stainless Steel, Super Duplex, and Inconel 718. Every ring is polished to a mirror finish of Ra 0.8 μm, eliminating the micro-leak paths that plague lesser gaskets. Whether you are managing a high-pressure subsea manifold or a critical refinery unit, Kriloha HX Seal Rings provide the mechanical intelligence and metallurgical stamina required for undisputed safety.

Primary Use Cases

Subsea Wellhead Equipment: Providing high-reliability sealing for underwater trees and manifolds where intervention is costly.
High-Temperature Thermal Cycles: Ideal for applications that undergo rapid heating and cooling, such as steam injection or refinery reactors.
Large Diameter Manifolds: Ensuring a balanced seal across large-scale oil and gas distribution headers.
Offshore Riser Connections: Managing the dynamic loads and pressures of deepwater drilling risers.
Critical Chemical Reactors: Reliable containment for volatile and hazardous chemical synthesis at high pressures.

FAQs

Can I replace my standard R-series gasket with an HX ring?

Yes. The HX ring is designed to be dimensionaly interchangeable with R and RX series gaskets, allowing you to upgrade your sealing performance without changing your existing flanges.

What makes the HX better than the RX series?

While both are pressure-energized, the HX profile typically offers better elastic recovery (“spring-back”). This makes it superior for applications with frequent thermal cycling or where flanges may experience slight separation.

Does the HX ring require special bolt torque?

Because it is a high-efficiency seal, the HX ring can often achieve a seal at lower bolt loads than solid rings. However, Kriloha recommends following our specific torque charts to ensure the lips are properly energized.

Is the HX ring reusable?

Like all metal-to-metal interference seals, the HX ring undergoes plastic deformation during installation. Kriloha strongly advises using a new ring for every assembly to guarantee a gas-tight seal.

How does the HX ring handle sour gas (H2S)?

Kriloha manufactures HX rings in full compliance with NACE MR0175/ISO 15156. We use corrosion-resistant alloys like Inconel 625 with strictly controlled hardness levels to prevent sulfide stress cracking.