RTJ Flanges / Ring Type Joint Flanges

Stainless Steel | Carbon Steel | Alloy Steel | Duplex | Nickel Alloy Ring Type Joint Flanges Manufacturer & Exporter in Mumbai, India

What Are Ring Type Joint (RTJ) Flanges?

A Ring Type Joint Flange is a precision-machined flange featuring a deep groove cut into its face. A metallic ring gasket with an oval or octagonal cross-section is seated in this groove. As connecting bolts are tightened, the ring undergoes plastic deformation creating intimate metal-to-metal contact resulting in a leak-proof, pressure-energised seal. The seal actually improves as internal pressure increases, making RTJ Flanges the preferred choice for severe service conditions.

There are different faces for a flange. These faces have the preliminary use as contact surfaces. Usually, the sealing gasket sits on this face and thus seals the connection. The Flat Faced Ring Type Joint Flanges have a flat face that is not raised. The RTJ flange dimensions vary according to standards and needs. We have a detailed RTJ flange weight chart for our clients to make the selection easy. The standards for RTJ Flanges make them fit under 24 inches. Ring Type Joint Weld Flange has a groove in the ring so that the gasket often squeezes into the groove. Ring Type Joint Raised Face Flanges have a raised face for extra grip and easy handling as well as strength. ANSI B16.5 Class 150 Ring Type Joint Flanges are one of the low pressure class flanges. Stainless Steel Ring Type Joint Flanges can also come in other dimensions.

What are B16.5 Ring Type Joint Flanges?

B16.5 Ring Type Joint (RTJ) Flanges are used in high pressure and high temperature applications. They have a specially designed groove on their face that accommodates a metal ring gasket, which provides a secure & leak-free seal.

Per ASME B16.5, the groove sidewall angle is 23° and the surface finish must not exceed 1.6 µm Ra to ensure reliable metal-to-metal sealing. Key groove tolerances: Depth E (+0.40 mm / -0.00 mm), Width F (±0.20 mm), Pitch Diameter P (±0.013 mm).

ASME B16.5 RTJ Flange Standard Specifications

Complete specification details for our Ring Joint Flanges:

Material Grades for Ring Type Joint Flanges

We manufacture RTJ Flanges in the following materials and grades:

ASME B16.5 RTJ Flange Dimensions - Class 150

Dimensional data (all measurements in mm) for Class 150 Ring Type Joint Flanges:

Note: For complete RTJ flange dimensions for Class 300, 400, 600, 900, 1500, and 2500, please contact our technical team or request our detailed dimension chart PDF.

RTJ Flange Pressure Ratings - ASME B16.5 (MPa)

Maximum allowable working pressure (in MPa) for Ring Type Joint Flanges across all pressure classes:

At ambient temperature (-29°C to 38°C), Class 2500 RTJ Flanges are rated at 431 MPa (approximately 62,500 psi), making them suitable for the most extreme high-pressure applications in oil & gas and petrochemical industries.

RTJ Flange Gasket Ring Number Chart (ASME B16.20)

Ring Type Joint Flanges require metallic ring gaskets manufactured per ASME B16.20. Selected ring numbers for common sizes and classes:

Ring gaskets are available in oval and octagonal cross-sections in materials including Soft Iron, Low Carbon Steel, F304/F316 Stainless Steel, Monel, Inconel, and more. Octagonal rings provide a better seal for higher pressure classes.

Types of Ring Type Joint Flanges Available

Amardeep Steel supplies all standard RTJ Flange types:

• Weld Neck RTJ Flanges (WNRTJ): Most common type; the tapered hub provides excellent stress distribution, ideal for high-pressure and cyclic service.
• Slip-On RTJ Flanges: Slides over the pipe and is welded inside and outside. Lower cost than weld neck. 
• Blind RTJ Flanges: Used to blank off pipeline ends, valves, or pressure vessel openings. 
• Socket Weld RTJ Flanges: For small-bore high-pressure piping; pipe inserted into socket before welding.
• Threaded RTJ Flanges: Screwed onto threaded pipe ends; no welding required. 
• Orifice RTJ Flanges: Fitted with tapped holes for pressure measurement; used in flow metering applications. 
• Reducing RTJ Flanges: Allow connection between pipes of different sizes.

Advantages & Disadvantages of Ring Type Joint Flanges

Advantages

• Superior Sealing Performance: Metal-to-metal contact provides a leak-proof seal under extreme pressure conditions up to 15,000 psi (103 MPa) and beyond.
• Pressure-Energised: The higher the working pressure, the better the sealing performance - ideal for high-pressure gas and fluid pipelines.
• High-Temperature Capability: Metallic gaskets maintain integrity at temperatures far beyond the limits of elastomeric or spiral-wound gaskets.
• Suitable for Cyclic Service: Withstands cyclic stresses and temperature fluctuations without seal failure.
• Versatile Material Options: Available in Carbon Steel, Stainless Steel, Alloy Steel, Duplex, Inconel, Monel, Hastelloy, and more.
• Applicable to All Flange Types: RTJ facing can be applied to Weld Neck, Slip-On, Socket Weld, Threaded, Blind, and Reducing flanges.

Disadvantages

• Higher Cost: Precision machining of both the groove and the metallic ring gasket increases manufacturing cost compared to Raised Face flanges.
• Requires Adequate Space: Flanges must be forcibly separated to release the ring from the groove, requiring clearance space for maintenance.
• Precision Required: The groove dimensions and surface finish must be held to tight tolerances for reliable sealing performance.

Applications of RTJ Flanges

Ring Type Joint Flanges from Amardeep Steel Centre are used in critical piping systems across the following industries:

• Oil & Gas Pipelines: Wellheads, christmas trees, subsea pipelines, and refinery piping where high-pressure integrity is non-negotiable.
• Petrochemical & Chemical Processing: Reactors, heat exchangers, and process piping handling corrosive or volatile fluids.
• Power Generation Plants: High-pressure steam lines, boiler feedwater systems, and turbine connections.
• Offshore Platforms: Subsea connections and topside piping subject to extreme pressures and marine corrosion.
• LNG & Gas Transmission: Cryogenic pipelines and high-pressure gas transmission networks.
• Pharmaceutical & Food Processing: Stainless Steel RTJ Flanges for hygienic, high-purity service.
• Plumbing, HVAC & Water Supply Systems: Industrial water supply and heating systems requiring reliable long-term sealing.
• Paper & Pulp Industry: Chemical recovery and high-pressure steam applications.

RTJ Flanges by Material

Amardeep Steel Centre manufactures Ring Type Joint Flanges in a comprehensive range of materials. Explore our dedicated material pages:

• Stainless Steel Flanges - Grade 304, 304L, 316, 316L, 321, 347, 904L
• Carbon Steel Flanges - ASTM A105, A350 LF2, A694
• Alloy Steel Flanges - F11, F22, F91, F5, F9
• Duplex Steel Flanges - F51, F53, F55 (Duplex 2205 / 2507)
• Inconel Flanges - Inconel 600, 601, 625, 800, 825
• Hastelloy Flanges - Hastelloy C276, C22
• Monel Flanges - Monel 400, Monel 500
• Nickel Alloy Flanges - Nickel 200, Nickel 201

Related Flange Types

In addition to Ring Type Joint Flanges, Amardeep Steel Centre supplies the complete range of industrial flanges:

• ANSI / ASME / ASA B16.5 Flanges
• Weld Neck Raised Face Flanges
• Slip-on Raised Face Flanges
• Blind Raised Face Flanges
• Socket Weld Raised Face Flanges
• Spectacle Blind Flanges
• Groove & Tongue Flanges
• Orifice Flanges
• Reducing Flanges

Why Choose Amardeep Steel Centre for RTJ Flanges?

• Certified Manufacturer: All Ring Type Joint Flanges are manufactured and tested per ASME B16.5, ASME B16.47, MSS SP-44, and API standards.
• EIL Approved: Amardeep Steel Centre is an Engineers India Limited (EIL) approved vendor - a mark of quality recognized by major oil & gas companies.
• Wide Material Range: From ASTM A105 Carbon Steel RTJ Flanges to Exotic Alloys including Inconel 625, Hastelloy C276, Titanium, and Super Duplex F53.
• Custom Sizes: We manufacture RTJ Flanges from 1/8" to 84" NB and can produce custom dimensions per client drawings.
• Global Exporter: We export to Saudi Arabia, UAE, USA, UK, Germany, Australia, Singapore, Malaysia, and 50+ countries worldwide.
• Full Traceability: All flanges are supplied with Mill Test Certificates, heat & lot numbers, and third-party inspection support.
• Competitive Pricing: Direct manufacturer pricing with no middlemen, backed by a large in-house inventory for fast delivery.