Flanges and their joints - Part 4: Qualification of personnel competency in the assembly of the bolted connections of critical service pressurized systems; German version EN 1591-4:2013— 20 стр.
23.040.60 Flanges, couplings and joints / Фланцы, муфты и соединения
03.100.30 Management. Including staff training, staff responsibilities, staff qualifications and certification / Управление трудовыми ресурсами. Включая обучение персонала и выдачу сертификатов
