The CD-ROM contains calculation modules (Microsoft Excel) for the design and construction of pressure vessel components according to EN13445-3: 2012. The systematic input of the parameters creates verifiable data sheets with a clear calculation structure. Each calculation allows the immediate assessment of the results, the change of the input values and thus an optimal view of the variants. Databases with important substance values and parameters are stored and can be extended by user-defined values. Drop-down menus for retrieving material data, stored technical information via mouse over, input conditions for protection against error entries, details sketches and error messages support the user in the safe input of values.