... diameter: 6 ~ 4000mm c, Flange structure type: welding, socket welding, threaded connection, loose, butt weld and blind flange ... of Americas flange system 2) Nominal diameter: 10mm ~ 4000mm 3) The flange structure: Integral flange Unit flange a, threaded flange b, welding ... flange, welding neck flange, welding neck flange, socket weld flange with neck ...