Ring Type Joint Face Flange

Ring type joint flanges (RTJ flanges) are special flange types designed for high pressure, high temperature, and strict leakage prevention applications. Their sealing surface features precision-machined annular grooves that work with metal ring gaskets, achieving reliable sealing through initial line contact and pressure self-energizing action. The nickel alloy ring type joint flanges supplied by Hefei Tailan Metal Co., Ltd. are manufactured from high-quality nickel-based alloy forgings through multiple precision processes including forging, solution heat treatment, precision machining, annular groove milling, drilling, and pickling/passivation. Featuring high sealing pressure, excellent high-temperature performance, reliable sealing, and reusability, they are the ideal choice for pipe connections in demanding applications such as petrochemical, offshore engineering, nuclear power energy, and high-pressure gas processing.

Working Principle:

The sealing principle of RTJ flanges is based on initial line contact of the metal ring gasket and pressure self-energizing effect. When bolts are pre-tensioned, the metal ring gasket forms initial line contact with the flange grooves; when media pressure enters the inner side of the ring, it creates an outward expanding force, making the contact between ring and grooves tighter, achieving the effect of tighter seal with higher pressure.

Flange Types:

1. Welding Neck RTJ Flange: Butt-welded to pipe, optimal stress distribution
2. Slip-On RTJ Flange: Slides onto pipe end for welding, easy installation
3. Blind RTJ Flange: Closing pipe ends or equipment openings
4. Lap Joint RTJ Flange: Used with stub end

Supply Range

Nominal Diameter (DN/NPS): DN15 – DN600 (1/2 inch – 24 inches); Larger sizes negotiable

Pressure Class: Class 150, 300, 600, 900, 1500, 2500 (ASME); API 2000-20000

Ring Groove Number: R, RX, BX series (determined by pressure class and diameter)

Ring Groove Roughness: Ra ≤1.6μm, ensuring good contact with metal ring gasket

Ring Groove Dimension Tolerance: Strictly controlled according to ASME B16.5 or API 6A standards

Surface Condition Machined, Pickled

Ring Groove Type Description:

1. R Series: Standard octagonal or oval ring gaskets, suitable for Class 150-2500
2. RX Series: Pressure self-energizing ring gaskets, suitable for Class 2000-20000
3. BX Series: Pressure self-energizing ring gaskets, suitable for API 5000-20000, groove depth control required