Vertical single-wall steel tanks with less than 1000 litre capacity, for the above ground storage of flammable and non-flammable water polluting liquids
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/1989

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