Flanges and their joints - Design rules for gasketed circular flange connections - Part 4: Qualification of personnel competency in the assembly of bolted joints fitted to equipment subject to the Pressure Equipment Directive
法兰及其连接件.带垫圈的圆形法兰连接件的设计规则.第4部分:装配在符合压力设备指令的设备上的螺栓连接件的人员能力鉴定