* ASME/ANSI b16.5: Welding neck flange, slip-on flange, blind flange, high hub blind flange, socket weld flange. Lapjoint flange, threaded flange. Ring type joint flange.
Pressure class: 150, 300, 400, 600, 900, 1500, 2500

* ASME/ANSI b16.47: Welding neck flange, blind flange. (series a & b)
Pressure class: 75, 150, 300, 400, 600, 900

* ASME/ANSI b16.36: (orifice flanges) welding neck flange, slipon flange, threaded flange.
Pressure class: 300, 400, 600, 900, 1500, 2500

* ASTM/ANSI b16.48: ( figure-8 blanks)
Pressure class: 150, 300, 400, 600, 900, 1500, 2500

* MSS SP44: Welding neck flange, blind flange.
Pressure class: 300, 400, 600, 900

* API 6A: Welding neck flange, thread flange, blind flange.
Pressure: 2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20000psi, 25000psi.