A total of 19 program modules (Microsoft Excel) enable the user to perform reliable calculations for key components or assemblies in pressure vessels. The results of each calculation are directly presented. The user can then modify the input data to optimize the evaluation of variants. Materials databases for the most important types of steel and seals together with characteristic values from the latest standards are stored in the system. A User's Guide is included with the CD-ROM, which shows a sample calculation for each of the 19 modules.