Steel collar flanges GOST 12821-80 Pn 25

Steel collar flanges PN 25, manufactured according to the standard GOST 12821-80, are an important part of pipeline systems and are designed for connecting pipes, pipeline valves and other pipeline elements. These flanges provide reliable and tight connections at high pressures and temperatures. Their design includes the so-called "collar," which allows the flange to be joined to the pipe by welding. The connection is made by butt welding, which ensures high strength and tightness.

Designation in technical documentation

Flanges are designated as follows:
Example: "GOST 12821-80 1-80-63 St.20", where:

• “1” — product execution number;
• “80” — nominal diameter (DN), mm;
• “63” — nominal pressure (PN), kgf/cm²;
• “St.20” — steel grade.

Application

Steel collar flanges GOST 12821-80 are widely used in the following fields:

1. Oil and gas industry.
2. Chemical and petrochemical industries.
3. Energy sector.
4. Water supply and heating systems.

Advantages of GOST 12821-80 collar flanges

1. High connection strength due to butt welding.
2. Ability to operate at high pressures.
3. Versatility of application in many industrial fields.