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Ring Type Joint Gaskets

HTX Products

Ring Type Joint Gaskets (RTJs)

A Ring Type Joint (RTJ) gasket is a precision-machined metallic ring used for metal-to-metal sealing applications in high-pressure, high-temperature flange connections. As torque is applied, the gasket plastically deforms to fill the flange groove, ensuring a reliable, leak-tight seal. Because of their ability to maintain integrity under extreme loads, RTJ gaskets are widely used in oil, gas, petrochemical, and industrial systems where failure is not an option.

Keep reading to learn about different types of RTJ gaskets available from HTX Products, common materials used to manufacture them, and examples of oil and gas applications that rely on them.

R-Type: Oval And Octagonal

The R-Type is the most common RTJ gasket, available in oval and octagonal cross-sections. Because these gaskets seal by deforming under pressure, they must be made from material softer than the corresponding mating flange. The oval design is compatible with bottom radius grooves, while the octagonal shape has a higher sealing coefficient. R-Type gaskets are rated up to 10,000 psi and manufactured in accordance with ASME B16.20 and API 6A. They are a dependable choice for general refinery, chemical, and pipeline service.

RX-Type

RX-Type RTJs feature a pressure-energized design that enhances the seal as internal pressure increases. This makes them ideal for systems subject to vibration or fluctuating pressure. They are interchangeable with R-Type flanges and are suitable for pressures from 1000 bar. These gaskets are well-suited to high pressures, heavy weight loads and vibration in blowout preventer (BOP) stacks.

SBX-Type And BX-Type

BX-Type and SBX-Type RTJs are used exclusively with 6BX flanges and 16BX hubs. Their trapezoidal geometry and pressure-balancing holes allow them to withstand extreme operating conditions up to 20,000 psi. These gaskets are commonly used in critical oilfield components, such as blowout preventers, choke and kill manifolds, and subsea wellhead systems.

The SBX profile incorporates modified angles and sealing geometry to improve load distribution and gasket compression under pressure. They also feature intersecting vent holes that facilitate seal formation underwater. Type Gaskets are made from non-corrosive material, in compliance with API 17D.

Kammprofile Gaskets

These gaskets combine a precision-machined serrated metal core with a soft facing material (i.e., expanded graphite, mica, PTFE). They create a high-integrity seal at comparatively low bolt loads and are frequently used in heat exchangers.

Lens Rings

Featuring spherical seating surfaces, lens rings naturally self-align under compression. They are mechanically stable and resist blow-out in high temperature and high pressure applications like heat exchangers, reactor vessels, and petrochemical operations.

Rubber-Coated RTJs

These gaskets feature a machined steel core with an oil-resistant nitrile coating that protects flange surfaces. They are often used for pressure testing of blowout preventers (BOPs), Christmas tree valves, and other wellhead components.