Pipework on ships and marine structures – Steel pipes and fittings with spigot and socket – Laying and treatment
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/1999

Ships and marine technology – Steel pipework and fittings with spigot and socket – Installation and assembly
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2017