... which used for connecting pipe.Flange Type: Welded flange, Welding neck flange, Male and female facing flange, Hubbed flange, Blind ... ANSI B16.47A/B <Large Diameter Steel Flanges> ,B16.36 etc.. a, ... a, threaded flange b, welding flange, welding neck flange, welding neck flange, socket weld flange with neck , slipon plate flange c, Loose flange ...