B9 module
Openings in pressure vessels reduce the pressure resisting surface of the base area. If the area reserve of the basic shell is unsufficient, a stiffener must be attached. Nozzles can be considered up to a maximum load-bearing length. If the ligament length between two openings is smaller than the shared load-bearing width of the base shell, it must be checked whether the load-bearing cross-sectional area suffices to support the pressure of the pressure loaded surface.
With the module B9 round openings in cylinders, cones, and spheres can be designed according to the equivalent pressure area method. Pad-type flanges, set-on or protruding nozzles as well as set-on discs are taken into account as reinforcing area.
AD 2000 Merkblaetter