American Standard Flange ANSI B16.5

The commonly used standard for American standard flanges is ANSI B16.5

ANSI B16.5 Class 150 Threaded Flanges

a. Nominal pressure: 150psi (2.0Mpa), 300psi (5.0Mpa), 400psi (6.8Mpa), 600psi (10.0Mpa), 900psi (15.0Mpa), 1500psi (25.0Mpa), 2500psi (42.0Mpa),
b. Calculated diameter: 6~4000mm
c. Flange structure type: bar welding, socket welding, threaded connection, loose sleeve, butt welding and flange cover d, flange sealing surface: concave surface, concave and convex surface, tongue and groove surface, metal ring connection surface