With the use of FEA software, pressure vessels and pipelines can be designed according to a code (e.g. ASME or PED) to obtain certification from a Notified Body (e.g. AIB-Vinçotte, Apragaz, TüV, Stoomwezen, DNV, Lloyd’s Register, Bureau Veritas).
Sometimes the design requires approval of elements that are beyond the standard sizes covered by the Code (e.g. a nozzle reinforcement that is outside the standard range). In that case, the correct design procedure using FEA permits approval.
In the illustration below, the stress distribution is shown in a pressure vessel (7 bar) with additional mechanical load on the flange.