Unlike bolted Ring flange connections can use the sandwich joint misalignments and imperfections, such as Runouts are equalized. Furthermore, doing away with some fatigue-critical areas (hot spots), because no screws and ring flanges are available. Also, no maintenance is required to control the bolts to possibly biasing force losses. On the other hand, the assembly work at sandwich joint is rated higher. Therefore, the advantages and disadvantages for a better overview are tabulated.