ANSI/ASME B16.5 & B16.47 Ring Type Joint Flange

What is Ring Type Joint Flange?

In the realm of high-pressure and high-temperature applications, where the demands on sealing mechanisms are rigorous, the Ring Type Joint (RTJ) flange emerges as a crucial component, especially prevalent in industries such as oil and gas. Recognized for its capacity to establish a robust and dependable seal, the RTJ flange plays a pivotal role in ensuring the integrity and safety of critical piping systems.

When selecting ANSI/ASME RTJ flanges, it is essential to refer to the specific standard (B16.5 or B16.47), identify the correct series (A or B), and choose the appropriate pressure class based on the requirements of your piping system. Adhering to these standards ensures that the flanges meet industry specifications, promoting safe and reliable performance in diverse industrial applications.

1. ANSI/ASME B16.5 RTJ Flange:

   • ANSI/ASME B16.5 covers flanges up to NPS 24 and provides pressure-temperature ratings. For RTJ flanges, common pressure classes include 150, 300, 600, 900, 1500, and 2500. Each pressure class corresponds to a specific maximum allowable working pressure at a given temperature.

2. ANSI/ASME B16.47 Series A and Series B RTJ Flange:

   • ANSI/ASME B16.47 is divided into Series A (MSS SP-44) and Series B (API 605). Each series includes a range of RTJ flange pressure classes. Series A typically covers larger diameter flanges, and Series B covers smaller diameter flanges. Pressure classes include 150, 300, 400, 600, 900, 1500, and 2500.

3. API 6A RTJ Flange:

   • API 6A is a standard specifically for wellhead and Christmas tree equipment. It includes specifications for RTJ flanges used in oil and gas applications. API 6A pressure classes range from 2,000 to 20,000 psi.

different types of RTJ Flanges ?

1. Raised Face (RF) RTJ Flange:

   • This type of RTJ flange features a raised face around the bore in addition to the special groove for the metal ring gasket. The raised face provides a visual indication and helps with proper alignment during installation.

2. Flat Face (FF) RTJ Flange:

   • Unlike the raised face, the flat face RTJ flange does not have a raised surface around the bore. It provides a flat mating surface for the installation of the metal ring gasket.

3. Male and Female RTJ Flange:

   • Male and female RTJ flanges have complementary grooves and protrusions on their faces, allowing them to mate securely. The male flange has a raised portion, while the female flange has a corresponding recess to accommodate the raised portion.

4. Tongue and Groove RTJ Flange:

   • Tongue and groove RTJ flanges have a design similar to male and female flanges but with a tongue-and-groove configuration. The tongue of one flange fits into the groove of the mating flange, creating a secure connection.

5. API Type RTJ Flange:

   • RTJ flanges conforming to API (American Petroleum Institute) standards are commonly used in the oil and gas industry. These flanges are designed to meet specific requirements outlined by API, ensuring compatibility with industry practices and standards.

6. Hub Type RTJ Flange:

   • Hub type RTJ flanges have an extended hub on one or both sides, providing additional reinforcement and support for the connection. The hub adds strength to the flange, making it suitable for high-stress applications.

7. Subsea RTJ Flange:

   • Subsea RTJ flanges are designed for use in underwater applications. They are constructed to withstand the unique challenges of subsea environments, including corrosion resistance and pressure considerations.

8. Compact RTJ Flange:

   • Compact RTJ flanges are designed to be more lightweight and space-efficient while maintaining the pressure-energized sealing mechanism. They are suitable for applications where space or weight constraints are critical.

9. Compact Flange System (CFS) RTJ Flange:

   • The Compact Flange System is a specific design of RTJ flange that provides a compact and lightweight alternative to traditional flange systems. CFS RTJ flanges offer significant weight and space savings while maintaining high-pressure capabilities.

Advantages of RTJ Flange?

Ring Type Joint (RTJ) flanges offer several advantages, making them a preferred choice in specific high-pressure and high-temperature applications. Here are some key advantages of RTJ flanges:

1. High Pressure and Temperature Resistance: RTJ flanges are designed to withstand extreme pressure and temperature conditions, making them suitable for applications in industries such as oil and gas, petrochemicals, and power generation.

2. Pressure-Energized Seal: The pressure-energized seal provided by the metal ring gasket in the RTJ flange ensures a reliable and tight seal even under fluctuating or high-pressure conditions. This contributes to the overall integrity and safety of the piping system.

3. Reliability in Critical Environments: In critical environments where standard gaskets may fail to provide adequate sealing, RTJ flanges excel. They are particularly effective in applications where maintaining a leak-free seal is essential for safety and operational efficiency.

4. Reusability: RTJ flanges and their metal ring gaskets are often designed for reuse, provided they are not damaged during the disassembly process. This can be advantageous in situations where equipment needs to be periodically inspected, maintained, or reconfigured.

5. Suitability for High-Stress Applications: The RTJ flange design, with its metal ring gasket providing a robust sealing solution, makes it well-suited for high-stress applications. This includes environments with cyclic loading, thermal cycling, and other challenging conditions.

6. Compatibility with Various Materials: RTJ flanges can be manufactured from a variety of materials, allowing for compatibility with different types of fluids and gases. The choice of materials can be tailored to meet the specific requirements of the application, considering factors such as corrosion resistance and chemical compatibility.

7. Versatility in Design: RTJ flanges come in various types, including different facing configurations such as raised face (RF) and ring type joint (RTJ). This versatility allows for customization based on the specific needs of the system and the industry standards in use.

8. Consistent Sealing Surface: The use of a metal ring gasket in the groove of the RTJ flange provides a consistent and uniform sealing surface. This contributes to the effectiveness of the seal and reduces the likelihood of leaks.