RTJ — Ring Type Joints

Ring Type Joints are widely used in petrochemical, oil and gas, high-pressure equipment and assemblies with RTJ grooved flanges.

The ring deforms locally against the groove to create the seal. Performance therefore depends heavily on:

• the correct profile;
• the ring material grade;
• dimensions;
• surface finish of the ring and groove;
• tightening;
• flange integrity.

The current range includes:

• API 6A for many oilfield applications;
• ASME B16.20;
• versions corresponding to ASME, BS and DIN flanges, depending on the profile.

The standard and ring number must be clearly stated on every enquiry where available.

R Oval

Traditional oval-section profile used in matching grooves.

R Octagonal

Octagonal profile with different contact geometry. Never consider R Oval and R Octagonal interchangeable without checking the groove and standard.

RX

Pressure-energised profile used in certain API flanges and classes.

BX

Profile for specific very-high-pressure flange systems to API requirements.

Depending on equipment design, EST can also supply or assess:

• transition rings;
• Weld Rings;
• Lens Rings;
• other machined metal rings.

These solutions are covered in more detail on the Special metal gaskets page.

Available materials include:

• soft iron;
• low-carbon steel;
• F5;
• 304 / 316 / 347 / 410 stainless steel;
• Grade 2 titanium;
• alloys 600 / 625 / 800 / 825;
• Hastelloy;
• C276;
• SMO 254;
• Zeron 100;
• Super Duplex.

Material selection depends on flange material, fluid, temperature, required hardness and applicable standards.

Certain alloys can be supplied with traceability and specific certification, particularly where NACE requirements apply.

Material certificates and specific requirements are available on request and confirmed case by case at quotation stage.