NPS4-Class150 SORF 20 ANSI B16.5 flange I know is American Standard hubbed flange 4 inch, the production standard for ANSI B16.5 but the 20 is what? I'm not sure. Some manufacturers say they represent Steel No. 20, and some say the thickness of the pipe connection. Some say the pressure of 20KG. Trouble professionals on behalf of doubts
20#, that is, carbon steel, means carbon steel is also right, carbon steel including 20#. Hope to be of help to you.
Carbon steelSome manufacturers say that steel number 20 is correct
There is no doubt that the pressure is 20# steel kg has been given and whether it is Class150 or American Standard American Standard GB no 20 kg standard will be marked as PN2.5 or PN16 PN1.6 standard flange PN25 like no PN20 or PN2.0.In addition SO with diameter flange sealing surface is a process of RF on behalf of the form
