压力管道标准(DN—Ф 对比)规格(大外径系列):DN—公称直径 ;Ф-外径DN15—Ф22mm,DN20-Ф27mm;DN25-Ф34mm,DN32-Ф42mmDN40—Ф48mm,DN50-Ф60mm;DN65-Ф76(73)mm,DN80-Ф89mmDN100-Ф114mm,DN125-Ф140mm;DN150—Ф168mm,DN200-Ф219mmDN250-Ф273mm,DN300-Ф324mm;DN350-Ф360mm,DN400-Ф406mmDN450-Ф457mm,DN500-Ф508mm;DN600-Ф610mm 规格(小外径系列):DN-公称直径 ;Ф-外径DN15-Ф18mm,DN20—Ф25mm;DN25-Ф32mm,DN32-Ф38mmDN40—Ф45mm,DN50—Ф57mm;DN65-Ф73mm,DN80-Ф89mmDN100—Ф108mm,DN125-Ф133mm;DN150—Ф159mm,DN200-Ф219mmDN250-Ф273mm,DN300-Ф325mm;DN350-Ф377mm,DN400-Ф426mmDN450-Ф480mm,DN500-Ф530mm;DN600—Ф630mm