Stainless steel fittings for the aseptic, chemical and pharmaceutical industries – Part 2: Aseptic flanged pipe connection, standard type
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2008

Stainless steel components for aseptic applications in the chemical and the pharmaceutical industries – Part 2: Flange connections
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2017