Detail design

Detail design is the engineering phase that turns the approved structural and systems arrangement into fabrication-ready information: shell expansion, plate nesting, weld details, pipe spools, cable schedules, and the production drawings a yard builds from. It follows concept and basic (contract) design and precedes or overlaps production engineering. Where basic design fixes the midship section, the global scantlings, and class approval, detail design resolves every bracket, cutout, collar, and end connection, including the fatigue-sensitive details that the assessment depends on. Modern practice does it in a 3-D product model that drives CNC cutting and the bill of material, so the weight estimate firms up here from a structural rollup of actual plate and stiffener takeoffs rather than parametric formulas.