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