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Introduction
DIN flanges are one of the flange standards. DIN is a standard developed by the German Standards Association and is commonly used in Europe. If you are engaged in the industrial piping industry, you must know some knowledge about DIN flanges. They are in metric units.
In this article, we will introduce DIN flanges, such as types, features, and similarities and differences with other standard flanges.
What Is a DIN Flange?
DIN flanges are based on the German Standards Association and are mostly used in Europe. Like AMSE and other standards, they are a basis for producing flanges.
Key Features of DIN Flanges:
Unit: DIN flanges are in metric units, i.e. millimeters.
Pressure level: The nominal pressure is expressed in PN units. That is, PN6, PN 10, etc.
Quality standards: Flanges produced according to DIN standards meet industrial requirements.
Types of DIN Flanges
1. Welding Neck Flange (DIN 2633, DIN 2632)
It has a long neck, and the neck can be welded when welding.
It is mostly used in high-pressure pipeline systems, such as refineries, power plants, etc.
2. Slip-On Flange (DIN 2576, DIN 2642)
It has a shorter neck, and the pipe needs to be inserted into the flange before welding.
It is easy to install, but it can withstand lower pressure than welding flanges.
3. Blind Flange (DIN 2527)
It is solid and is mostly used to close the end of the pipeline.
These flanges are easy to disassemble at the end, which is more convenient for expanding the pipeline.
It is a good choice for temporary testing of pipeline pressure.
4. Lap Joint Flange (DIN 2641, DIN 2642)
It consists of two parts and is supported by a flange, which is conducive to rotational alignment.
It is widely used in pipes that need to be frequently disassembled.
5.Threaded Flange (DIN 2565, DIN 2566)
The flange has threads inside and can be screwed directly onto the pipe.
It is mostly used in pipes with smaller diameters and lower pressures.
DIN Flange Pressure Ratings (PN)
DIN flanges use PN to indicate pressure ratings. The larger the PN value, the greater the pressure it can withstand.
The following are some common ratings:
| DIN Flange Class | Pressure Rating (bar) | Common Applications |
|---|---|---|
| PN6 | Up to 6 bar | Low-pressure systems, HVAC |
| PN10 | Up to 10 bar | Water supply, irrigation |
| PN16 | Up to 16 bar | Industrial piping, compressed air |
| PN25 | Up to 25 bar | Oil & gas, chemical plants |
| PN40 | Up to 40 bar | High-pressure steam, power plants |
What Is the Difference Between DIN and ANSI Flanges?
DIN flanges are German standard flanges, mostly used in European countries.
ASNI is a flange standard established by the American National Standards Institute, mostly used in the United States and some Asian regions.
The following is a comparison between the two:
| Feature | DIN Flanges | ANSI Flanges |
|---|---|---|
| Measurement | Metric (mm) | Imperial (inches) |
| Pressure Ratings | PN (e.g., PN16, PN40) | Class (e.g., 150, 300, 600) |
| Common in | Europe, Asia | North America |
Can DIN and ANSI Flanges Be Interchanged?
The two cannot be directly interchanged. Because their sizes and pressure ratings are different. If they must be interchanged, special adapters or conversion flanges are required to connect them.
What Is the Difference Between DIN and ASME Flanges?
ASME is a flange standard established by the American Machinery Association. It is mostly used for some high-temperature and high-pressure industrial pipelines.
DIN is a flange standard formulated by the German Standards Association. It is mostly used in conventional pipeline systems.
What Is the Difference Between DIN Flange and PN Flange?
DIN flange is a flange standard.
PN flange refers to the flange pressure level.
Choosing the Right DIN Flange
When choosing a DIN flange, you can refer to the following 4 points for selection:
1. Pressure level: Make sure that the pressure level you choose is suitable for the pipeline system.
2. Material selection: The materials include carbon steel, stainless steel and alloy steel.
3. Size: Choose the appropriate flange size and diameter according to the pipeline.
4. Installation: Choose the appropriate installation method according to the actual use environment and size. Such as welding, sleeve or threaded connection.
Summary
This article introduces what DIN flange is and its characteristics, types, etc. The nominal pressure of DIN flange is expressed in PN. It also introduces the difference between ASME and ANSI. The three cannot be directly interchangeable. The corrosion resistance and high pressure resistance of flanges of different materials are also different. I believe you must have some understanding of how to choose flanges. When choosing, you should consider whether it is used for industrial pipelines such as oil and gas, and HVAC systems.
