75 psig For pipe flanges the class rating is the pressure rating for the flange, in pounds per square inch - gauge (psig).
It's #150.
Raised Face Flanged End
Raised face through bolted ends
Protection class codes in Washington are determined by the Washington Surveying and Rating Bureau.
what is the freight class for a metal flange? I think it is class 80 but I can't be sure
Pressure Nominal 40; 40 bar pressure rating for European flange
The term"counter flange" is used in Europe to refer to a mating flange to make up a flange pair. For example a "counter flange" attached to a pipe must have the same bolt circle diameter, number of bolts, and size of bolts and pressure rating at the equipment nozzle flange provided by an equipment manufacturer.
To find out the area of flange the farmula is = (3.142/4)*((o.d sq.- i.d sq.)*1.1
class
Stub class is where the seat is located, the higher the rating the better the seat.
The DK-2600D Phantom Series Class D Monoblock has a 4 out of 5 star SPL rating currently. You can find more information at http://www.nextag.com.