DS EN 1759-1:2004
DS EN 1759-1:2004 Flanges And Their Joints - Circular Flanges For Pipes, Valves, Fittings And Accessories, Class Designated - Part 1: Steel Flanges, Nps 1/2 To 24 Defines requirements for circular steel flanges in Class designations Class 150 to Class 2500 and nominal sizes from NPS 1/2 to NPS 24.