* asme/ansi b16.47 : welding neck flange, blind flange. (series a & b)
Pressure class : 75, 150, 300, 400 , 600 , 900
Pressure class :300, 400 , 600 , 900
* api 6a : welding neck flange, thread flange, blind flange.
* size:1/2"-48"as
11000*11000*11000
