DIN CEN/TS 1591-4 Flanges and their joints - Design rules for gasketed circular flange connections - Part 4: Qualification of personnel competency in the assembly of bolted joints fitted to equipment subject to the Pressure Equipment Directive; German version CEN/TS 1591-4:2007

standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2007