EN 13445 (the European Unfired Pressure Vessel Standard) is the most important harmonized standard for the PED (Pressure Equipment Directive). Its part 3 (Design) contains many new advanced calculation methods, such as the alternative method of Annex G for bolted flange connections and the alternative method of Annex J for tubesheets. The complete software package includes modules for the calculation of horizontal and vertical vessels on supports, local loads, rectangular vessels, columns under wind and seismic loads; specific program modules also allows the simplified fatigue assessment in accordance with Clauses 17 and the detailed fatigue assessment (after a complete DBA calculation) in accordance with Clause 18. An extensive material database with the main EN and ASME materials is supplied with the software; the allowable stresses may also be determined with the Alternative Route (i.e, higher allowable stresses with increased degree of material testing and NDT). The calculation of the test pressure required by the PED is also possible.