I checked a lot of standards and marked a F1, but I couldn't find the corresponding size in the corresponding manual! Good halo
Only the weld ring loose flange is marked with a higher flange flange height. Moreover, different levels of C in the standard flange thickness has been set to die, your height suddenly face protruding at the flange thickness meet the appropriate process to face, is usually a value of experience, what is the scope of a DN, but the protruding height is not high, are generally small according to DN, increased, increasing
Generally, this size is not fixed, should be depending on the actual use of the occasion, it seems to have an empirical formula to
You need to understand the flange protruding this piece is why, suddenly face RF, itself protruding surface it is used to put a car washer, water bursting on the surface, to seal gasket and better. Flange strength requirement is flange thickness of C, not protruding out of the thickness, too thick, coupled with the gasket, exposing a large gap, easy to rain or water rusty.
