The EN13445 design code is frequently used for pressure vessel design under the PED. Often the rules are applied using automated software packages and the engineer can lose the overview of the calculation being performed.   Our course aims to explain the fundamental equations and principles in these design rules. For example: What is the area replacement rule? How is the Taylor and Forge method applied? What inter-stiffener distance is required to prevent collapse under vacuum? What is the difference between primary and secondary stresses?   This training is given by one of the experienced consulting engineers from DRG who constantly work on piping and pressure vessel problems. As well as explaining the rules and how to apply them, the trainer will also challenge the participants on why a rule is formulated in a particular way and show some important differences with ASME B&PV VIII-1.