一、尺寸：DN15（4分管）、DN20（6分管）、DN25（1寸管）、DN32（1寸2管）、DN40（1寸半管）、DN50（2寸管）、DN65（2寸半管）、DN80（3寸管）、DN100（4寸管）、DN125（5寸管）、DN150（6寸管）、DN200（8寸管）、DN250（10寸管）等。二、把1英寸分成8等分:1/81/43/81/25/83/47/8英寸。相当于通常说的1分管到7分管,更小的尺寸用1/16、1/32、1/64来
表
关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf
示，单位还是英寸。如果分母和分子能够约分（如分子是2、4、8、16、32）就应该约分。英寸的表示是在右上角打上两撇，如1/2"如DN25（25mm，下同）的水管就是英制1"的水管，也是以前的8分水管。DN15的水管就是英制1/2"的水管，也是以前的4分水管。如DN20的水管就是英制3/4"的水管，也是以前的6分水管外径与DN，NB的关系如下：公称管子尺寸(NPS)/in0.250.50.751.01.251.52.02.53.04.06.0公称直径(DN)/mm61520253240506580100150公称管子尺寸(NPS)/in8.010.012.014.016.018.020.024.036.042.048.0公称直径(DN)/mm20025030035040045050060090010001200管子规格及有关数据公称直径英寸外径近似内径壁厚相当于无缝管普厚/加厚mm＂mmmmmmmm154分21.25152.75/3.2522206分26.75202.75/3.525251寸33.5253.25/432321.2寸42.25323.25/438401.5寸48403.5/4.2545502寸60503.5/4.557702.5寸75.5703.75/4.57680388.5804/4.758910041141064/5.010812551401315/5.513315061651565/5.5159200821920762192501027325972733001232530984353501437794854001642695354501847895905002052996406002463010755700287201086080032820975国际管道尺寸对照表N.DINCHSTANDARDMETRICINCHCOPPERPVCPEDUCTILE15A1/2"21.72021.5-22.02220A3/4"27.2/28.52627.0-27.62625A1"34.03028.24303234.0-34.73432A1-1/4"42.73834.59353842.0-42.84840A1-1/2"48.644.540.95454848.0-48.96050A2"60.657.054.05556060.0-61.17665A2-1/2"76.376.166.75707676.0-77.38980A3"89.188.979.85858989.0-90.59890A3-1/2"101.6100A4"114.3108.0106.27110114114.0-115.9118125A5"139.8133.0131.67140140140.0-142.3144150A6"165.2159.0157.68160165165.0-167.6170200A8"216.3219.0208.48216216.0-218.8222250A10"267.4267.0260.50267267.0-270.1274300A12"318.5323.9312.11318318.0-321.3326350A14"355.6368.0363.72378400A16"406.4419.0414.52429450A18"457.2457.2465.32480500A20"508.0508.0516.94532550A22"558.8558.0567.74600A24"609.6619.0619.35635650A26"660.4700A28"711.2
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