SeaTec can provide a comprehensive structural analysis service for all types of engineering problems, from large scale ship structures to detail design issues. Although such analysis can be undertaken manually using Beam Theory, Plate Theory and other approximation methods, the modern approach is to carefully model the structural problem in detail on computer and apply Finite Element Analysis (FEA) techniques using specialist software. FEA essentially breaks down a structure into a fine mesh model of interconnecting plates or beams, which is then restrained and loaded to recreate the actual problem, then solved by straight forward mathematical stiffness calculations based on the material properties of the structure under consideration. The large number of equations generated by even a simple model are solved using matrix methods. SeaTec use the established Strand7(TM) software for FEA assessments, and have had several significant successes in solving difficult structural problems using this tool. On several occasions we have used FEA to investigate fatigue cracking issues on vessels in service to good effect. The FEA has identified the areas with, and magnitude of, peak stress causing the fatigue, which we have then re-analysed with our proposed modifications to the local structure, and measured the stress reductions. By iterating through several structural modifications, the affects on peak stress can be noted, and the optimum solution for an in-service repair found. We also use FEA at an early stage for newbuilding and concept designs, using a course mesh and smeared thickness technique to quickly derive stresses or deflections that will affect the development of the ship design.