Differences between DIN2503 and DIN2501 About Plate Flange

DIN 2503 and DIN 2501 are two different standards designed by the German Organization for Standardization (DIN) for flat welding flanges. These standards define the specifications, dimensions, materials, and manufacturing requirements for flange connections. Here are some of the main differences between them:

Flange form

DIN 2503: This standard applies to flat welding flanges, also known as plate type flat welding flanges. They have no raised necks.
DIN 2501: This standard applies to flanges with raised necks, such as those with threaded holes used in flange connections.

Sealing surface

DIN 2503: The sealing surface of flat welding flanges is generally flat.
DIN 2501: The sealing surface of raised flanges usually has a certain inclination or chamfer to easily fit with the sealing gasket to form a seal.

Application field

DIN 2503: Commonly used in situations that require economy, simple structure, but do not require high sealing performance, such as low-pressure, general-purpose pipeline connections.
DIN 2501: Suitable for applications that require higher sealing performance, such as high pressure, high temperature, high viscosity media, etc., because its sealing surface design can better match with the sealing gasket to provide better sealing performance.

Connection method

DIN 2503: Generally, flat welding is used for connection, which is relatively simple and usually fixed with rivets or bolts.
DIN 2501: Usually threaded connections, such as bolts, screws, etc., are used to connect flanges more tightly and provide better sealing performance.

Applicable pressure level

DIN 2503: Generally suitable for applications under low or medium pressure conditions.
DIN 2501: Suitable for a wider range of pressure levels, including high-pressure and ultra-high-pressure systems.

Overall, the main differences between DIN 2503 and DIN 2501 standards lie in the design of sealing surfaces, connection methods, and applicable scenarios. The selection of appropriate standards depends on specific engineering requirements, including pressure levels, sealing performance requirements, and connection methods.