The piping sketches comprise all those activities needed to develop all the workshop drawings and the material lists required for the workshop production of the pipes. After the necessary checks between the piping model and the functional diagrams, the hull and the furniture lay-out have been carried out in order to reduce potential discrepancies and interferences, installation and workshop drawings are made. They will include pieces mark-up and material lists for each piping sketch. Related accessory items are listed in dedicated tables.