Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories - Part 1: Steel flanges, PN designated; German version EN 1092-1:2001— 71 стр.
Metal-arc welding with covered electrode, gas-shielded metal-arc welding and gas welding; joint preparations for steel (ISO 9692:1992); German version EN 29692:1994— 14 стр.