DIN 28020
DIN 28020 Horizontal pressure vessels 0.63 m<(hoch)3> up to 25 m<(hoch)3> - Dimensions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2007
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2007