Ring Joint Gaskets Suppliers & Manufacturers in China

The Ultimate Guide to Ring Joint Gaskets

ASME B16.20 API 6A NACE MR0175 Up to 25,000 psi

In the demanding world of industrial sealing, where extreme pressures, temperatures, and volatile media are the norm, failure is not an option. For critical applications in oil and gas, petrochemical, and high-pressure processing industries, the integrity of a flange connection is paramount. This is where the Ring Joint Gaskets (RJGs) stand as the undisputed engineering solution. Unlike conventional gaskets that rely on compressive force across an entire surface, the ring joint gasket employs a precision metal-to-metal seal, creating an exceptionally reliable barrier against leakage in the most severe service conditions.

At Kaxite Seals, with decades of specialization in high-performance sealing solutions, we engineer ring joint gaskets that set the benchmark for safety, durability, and performance. Our commitment is to provide sealing components that not only meet but exceed the stringent requirements of global standards and client specifications.

Understanding Ring Joint Gasket Design and Function

A ring joint gasket is a solid metal ring with an oval or octagonal cross-section. It is designed to fit into a machined groove in the flange faces of both mating flanges, also known as RTJ flanges. When the flanges are bolted together, the gasket is compressed into the groove, creating two continuous lines of contact and forming a high-integrity seal. The primary sealing action is achieved through the plastic deformation of the gasket's raised contact points, which flow into any micro-imperfections in the flange groove, resulting in a leak-tight seal.

Key Advantages

• Superior Leak Tightness: Provides a hermetic seal suitable for toxic, flammable, and expensive fluids under high pressure.
• High-Pressure and High-Temperature Resilience: Capable of performing in services exceeding 25,000 psi and temperatures from cryogenic to over 1000°F (538°C).
• Reusability: Well-maintained ring joints can often be reused several times, offering long-term cost efficiency.
• Self-Energizing Seal: Internal system pressure acts to further enhance the sealing force, improving performance as pressure increases.
• Blowout Resistance: The confined groove design mechanically locks the gasket in place, preventing blowout under sudden pressure surges or fire conditions.

Product Specifications

Kaxite Seals manufactures ring joint gaskets in strict compliance with ASME B16.20 and API 6A standards. We offer a comprehensive range to suit all standard RTJ flange profiles, including R, RX, and BX styles, in both oval and octagonal cross-sections.

1. Material Grades and Specifications

Material selection is critical for corrosion resistance, temperature capability, and mechanical strength. Our standard offerings include:

2. Ring Joint Gasket Types and Profiles

Kaxite Seals provides all standard profiles to match your flange specifications, including Oval, Octagonal, RX, BX, and Lens Ring Joint Gaskets.

3. Dimensional Data Table: Sample R45 Ring Joint Gasket

*Note: This is a representative sample. Always consult Kaxite Seals for the exact dimensional chart corresponding to your ring number and specification.

How to Select the Right Ring Joint Gasket

1. Confirm the flange standard: Check whether the flange is ASME B16.5, ASME B16.20, API 6A, or another project specification.
2. Identify the ring profile: Select R, RX, or BX style based on pressure class, groove design, and whether a self-energizing or pressure-energized seal is required.
3. Choose oval or octagonal: Octagonal RTJ gaskets are generally preferred for reliability and reusability. Oval rings may be specified in older or specific flange designs.
4. Select the material grade: Match material to media corrosivity, H2S and CO2 content, operating temperature, pressure, and NACE MR0175/ISO 15156 requirements for sour service.
5. Verify dimensions: Confirm ring number, pitch diameter, width, height, and tolerances against the latest ASME or API dimensional table.
6. Review documentation: Request material test certificates, dimensional inspection reports, and third-party inspection when required.

Installation, Torque, and Reuse of RTJ Gaskets

• Ensure flange grooves and the gasket are clean, dry, and free of debris, rust, and old gasket material.
• Lightly lubricate the gasket with an approved anti-seize compound suitable for the service media and temperature.
• Position the gasket carefully in the flange groove. Do not force or damage the sealing surfaces.
• Use calibrated torque wrenches and follow a cross-pattern bolting sequence in multiple incremental steps, such as 30%, 60%, and 100% of final torque.
• Reuse only after careful inspection. Measure gasket height at multiple points and check for corrosion, scratches, grooves, or deformation.
• Replace any gasket compressed beyond the dimensional tolerances specified in API 6A, ASME B16.20, or the relevant project standard.

Quality Assurance at Kaxite Seals

At Kaxite Seals, quality is integral to our manufacturing process. We start with certified raw materials. Our CNC machining guarantees precise dimensional accuracy to ASME and API standards. We perform 100% dimensional inspection and surface finish checks. For critical applications, we provide Material Test Certificates per EN 10204 3.1 and can arrange third-party inspection. Our quality management system is designed to deliver traceable, reliable, and compliant ring joint gaskets for every order.

Related Sealing Solutions

• Spiral Wound Gaskets for standard flange sealing and heat exchangers.
• Serrated Gaskets and Kammprofile gaskets for high-pressure heat exchanger service.
• Expanded Graphite Gaskets for high-temperature and chemical resistance.
• Flange Insulation Gasket Kits for cathodic protection and electrical isolation.

Frequently Asked Questions