What does "-150# SO/FF" mean by flange 4?
Four inches, the pressure rating is 150, so is hubbed flange, FF for the whole plane sealing surface
This is a American Standard flange, corresponding to the standard ANSI B16.5, pressure 150LBS, varieties of SO (SLIP-ON, namely hubbed flange), FF refers to the sealing surface of the flange, from RF, RTJ and so on, size is 4 ", also called DN100.. Thank you.
American Standard, pressure rating of 150, hubbed flangeSealing surface plane of flange
Size: 4"Pound level: 150#SO: flat with neckFF: flat surface (flange sealing surface)
