DIN 6623-1
DIN 6623-1 Vertical steel tanks with less than 1 000 litre capacity, for the above ground storage of liquids - Part 1: Singlewall
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2017
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2017