公称通径 Nominal Pipe Size 外径 Outside Diameter 公称壁厚 T Norminal Wall Thickness NPS BN D SCH5s SCH10s SCH10 SCH20 SHC30 SCH40s STD SCH40 SCH60 SCH80s XS SCH80 SCH100 SCH120 SCH104 SCH160 XXS 1/8 1/4 3/8 6 8 10 --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- 1/2 3/4 1 15 20 25 --- --- --- ---