Analysis of a pressure vessel for safety and earthquake loads ✍️ In this project, we have optimized a pressure vessel to fulfil the requirements for earthquake safety as defined in EN 1998-1 ISO standard as well as in the pressure vessel codes. The FEM analysis results show that the original design needs to be optimized, the legs of the pressure vessel that are in contact with foundation plates do not provide enough strength to meet displacement criteria for earthquake accelerations. The optimized model presents a good solution for the weak parts of the original design and the pressure vessel can meet defined criteria based on EN 1998-1 and AD 2000 / EN 13445 with a good factor of safety.