DIN 1092-1 is a key European standard (by Deutsches Institut fur Normung) for circular flanges in pipe systems. It specifies dimensions, materials, pressure-temperature ratings, and connection types (e.g., welding neck, slip-on, blind flanges) for sizes from DN 10 to DN 4000.

The standard uses PN (Pressure Nominal) ratings (e.g., PN 6, PN 10, PN 16) to define pressure capabilities, ensuring compatibility across European and global applications. Widely adopted in chemical, water treatment, and process industries, it guarantees interchangeability, structural stability, and safe operation of flanged joints, supporting consistent design and installation of piping systems.