DIN Flange

What is DIN Flange?

DIN standard flanges are flanges that adhere to the specifications and standards set by the German Institute for Standardization (Deutsches Institut für Normung - DIN). DIN is a recognized standards organization that develops and publishes technical standards for a wide range of products and industries, including flanges used in piping systems. The DIN standard for flanges covers various aspects, including dimensions, materials, facing types, and pressure classes, to ensure interoperability and reliability in industrial applications. DIN standard flanges are commonly used in Europe and are widely recognized globally.

1. Nominal Pressure (PN): DIN standard flanges are categorized into different nominal pressure classes, denoted by PN values. Common PN classes include PN6, PN10, PN16, PN25, and PN40, with each class representing a specific pressure rating.

2. Facing Types: DIN standard flanges may have different facing types, such as flat face (FF), raised face (RF), and ring-type joint (RTJ). The facing type influences the gasket type and sealing characteristics.

3. Flange Types: DIN standard covers various types of flanges, including welding neck, slip-on, blind, lap joint, and threaded flanges. Each type serves different purposes in connecting pipes and components.

4. Materials: DIN standard specifies the permissible materials for flanges, considering factors such as corrosion resistance, temperature tolerance, and compatibility with the conveyed medium. Common materials include carbon steel, stainless steel, and alloy steel.

5. Dimensions: DIN standard provides detailed dimensions for flanges, including outside diameter, bolt circle diameter, bolt hole diameter, flange thickness, and face-to-face dimensions.

6. Marking: DIN standard requires flanges to be marked with essential information, including nominal size, nominal pressure, material specification, and manufacturer's identification.

Types of Flanges that fall under the DIN standard include:

DIN flanges encompass various types, each designed for specific applications and connection requirements within piping systems. These types of flanges come with different nominal pressure classes (PN), such as PN6, PN10, PN16, PN25, and PN40, allowing for flexibility in selecting the appropriate flange based on the pressure requirements of the piping system. The specific DIN standard and PN class should be considered when choosing the right type of DIN flange for a given application.

1. Welding Neck Flanges (DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635): These flanges have a long neck that is welded to the pipe. Welding neck flanges are known for their high strength and resistance to deformation under pressure. They are suitable for high-pressure applications.

2. Slip-On Flanges (DIN 2573, DIN 2576): Slip-on flanges are slipped over the pipe and then welded in place. They are relatively easy to install and are suitable for low-pressure applications.

3. Blind Flanges (DIN 2527): Blind flanges are solid disks used to close the end of pipes, valves, or equipment openings. They are commonly used to seal off a pipeline.

4. Plate Flanges (DIN 2573, DIN 2576): Plate flanges are flat and used to close the end of pipes or valves. They are commonly used in low-pressure applications.

5. Threaded Flanges (DIN 2565, DIN 2566): Threaded flanges have threads on the inner bore that match with the threads on the pipe. They are suitable for low-pressure applications.

6. Lap Joint Flanges (DIN 2641, DIN 2642): Lap joint flanges consist of two parts – a stub end and a backing flange. The stub end is welded to the pipe, and the backing flange is free to rotate.

7. Socket Weld Flanges (DIN 2558): Socket weld flanges have a socket for welding with the pipe. They are suitable for small-bore, high-pressure applications.

The most commonly used DIN flange standards:

1. DIN 2573 - PN6: Designed for low-pressure applications with a nominal pressure of 6 bar.

2. DIN 2576 - PN10: Suitable for applications with a nominal pressure of 10 bar.

3. DIN 2501 - PN16: Commonly used for medium-pressure applications with a nominal pressure of 16 bar.

4. DIN 2502 - PN25: Intended for higher-pressure applications with a nominal pressure of 25 bar.

5. DIN 2503 - PN40: Suitable for high-pressure applications with a nominal pressure of 40 bar.

6. DIN 2631 - PN6: Welding neck flanges for low-pressure applications with a nominal pressure of 6 bar.

7. DIN 2632 - PN10: Welding neck flanges for medium-pressure applications with a nominal pressure of 10 bar.

8. DIN 2633 - PN16: Welding neck flanges for medium-pressure applications with a nominal pressure of 16 bar.

9. DIN 2634 - PN25: Welding neck flanges for higher-pressure applications with a nominal pressure of 25 bar.

10. DIN 2635 - PN40: Welding neck flanges for high-pressure applications with a nominal pressure of 40 bar.

These standards specify the dimensions, materials, facing types, and other requirements for flanges to ensure compatibility and reliability in various piping systems. DIN flanges come in different types, including welding neck, slip-on, blind, and threaded, catering to different connection requirements.