DIN 86037-3
DIN 86037-3 Loose flanges and welding necks for pipes of copper-nickel-alloys - Part 3: Loose flanges
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/1995
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/1995