ANSI/ASME B16.5 Threaded Flange

What is Screwed Threaded Flange?

Threaded flanges, governed by ANSI/ASME standards, are a type of flange commonly used in piping systems where ease of assembly and disassembly is desired. The ANSI/ASME standards provide specifications for the dimensions, materials, and performance requirements of threaded flanges.

A screwed or threaded flange is a type of flange that is designed for threaded connections in a piping system. Instead of welding, which is common for weld neck or slip-on flanges, threaded flanges have an internal thread that allows them to be connected directly to threaded pipes or fittings. These flanges are often used in low-pressure applications and are suitable for systems where frequent disassembly and reassembly may be required.

Raised Face Threaded Flange

A raised face threaded flange is a type of threaded flange that features a raised portion around the bore or opening of the flange. This raised face serves several purposes, including providing a surface for better alignment, facilitating the application of a gasket, and helping to create a more secure and leak-resistant joint. raised face threaded flange requires careful consideration of the gasket material, as it plays a critical role in achieving a proper seal. Additionally, proper installation practices, including appropriate torqueing of the bolts, are crucial for ensuring the integrity of the raised face threaded flange joint.

key characteristics and features of screwed or threaded flanges

1. Threaded Connection:

   • The flange has an internal threaded bore, allowing it to be screwed onto a threaded pipe or fitting. The most common thread types for these flanges include National Pipe Thread (NPT) in the United States and British Standard Pipe (BSP) in many other parts of the world.

2. Easy Installation and Maintenance:

   • Screwed flanges offer ease of installation and maintenance since they can be easily assembled or disassembled without the need for welding. This makes them convenient for systems where frequent modifications or repairs are necessary.

3. Low to Moderate Pressure Applications:

   • Screwed threaded flanges are generally used in low to moderate-pressure piping systems. They may not be suitable for applications with very high pressures due to the limitations of threaded connections.

4. Materials and Standards:

   • These flanges are available in various materials, such as carbon steel, stainless steel, and alloy steel, depending on the application requirements. Standards such as ASME B16.5 and ASME B1.20.1 provide specifications for threaded flanges and threads, respectively.

5. Gasket Seal:

   • Like other types of flanges, screwed threaded flanges use gaskets between the flange faces to create a seal and prevent leakage. The type of gasket used depends on the specific requirements of the application.

6. Common Applications:

   • Screwed threaded flanges are often found in applications where simplicity of assembly and disassembly is important, and where the system operates at lower pressures. They are commonly used in industries such as plumbing, chemical processing, and certain utility applications.

The Three Main Components of A SORF Flanged Joint Are?

Threaded Flange:

The threaded flange itself is a key component of the joint. It has an internal threaded bore, allowing it to be screwed onto the external threads of a pipe or fitting. Threaded flanges come in various sizes, pressure classes, and materials to suit the requirements of the piping system.

Threaded Pipe or Fitting:

The threaded pipe or fitting is the second component of the joint. It has external threads that match the internal threads of the threaded flange. The threaded connection is achieved by screwing the flange onto the threaded end of the pipe or fitting. This threaded connection provides a secure and sealed joint.

Gasket:

A gasket is used between the faces of the threaded flange to create a seal and prevent leakage. The gasket serves to fill the irregularities and imperfections in the flange faces, ensuring a tight and leak-free connection. The type of gasket used depends on the specific requirements of the application, considering factors such as pressure, temperature, and the type of fluid being transported.