The term 'Responsible Charge' is newly introduced. In a nutshell, its contents can be described as follows: MANDATORY APPENDIX 47 - REQUIREMENTS FOR PRESSURE VESSEL DESIGNERS Since this is a 'Mandatory Appendix', the rules are obligatory and must be complied with as of the effective date of Edition 2021 on January 1, 2022. In the 2021 edition of ASME Code Section VIII, Division 1, the new Appendix 47 introduces rules for this previously neglected field. ASME Code Section VIII, Division 1 lays the responsibility for the correctness of the calculation in the hands of the manufacturer - where they get the calculation from is up to them. A detailed preliminary verification, as we know it from the Pressure Equipment Directive, was carried out in very few cases only, as this was not required. In the best case, the AI also made a random check to see whether all pressure-retaining parts were included in the calculation.
Generally, the manufacturer of the pressure vessel had a calculation available and their Authorized Inspector verified that it existed. So far so good, but what about design calculations? In ASME Code Section VIII, Division 1 - the standard set of rules for pressure vessels - there were previously no criteria for personnel doing this kind of work.
