如下就是钢管直径DN、NB、OD三者的对照表，这个表格在平时的工作中应用率很高，如有需要可以联系我，给你传份更详细的对照表。 DN（mm） NB(英寸) OD(mm) 15 1/2" 21.3 20 3/4" 26.7 25 1" 33.4 32 1.1/4" 42.2 40 1.1/2" 48.3 50 2" 60.3 65 2.1/2" 73

Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. Pipe size is specified with two non-dimensional numbers: a nominal pipe size (NPS) for diameter based on inches, and a schedule (Sched. or Sch.) for wall thickness.

NPS is American Standard of pipe size notation while NB is European and DN is standard from metric unit system. NPS gives information about related outer diameter of pipe, NB provides information related to internal diameter of pipe and In case of DN its niether Outer or Internal diameter but close to internal diameter of pipe.

NB：英制钢管单位的公称外径 (inch unit)，单位是inch. 具有实际代表意义 OD ：钢管的实际外径 (outside diameter)，单位是MM.具有实际代表意义。 DN: (nominal diameter)，又称平均外径 (mean outside diameter)。 单位是mm.最初应用这个数据是因为直缝钢管的管璧相对于直径很薄，直缝钢管外径与管内径相差无几，所以取直缝钢管的外径与直缝钢管的内径之平均值当作钢管公称直径的称呼。 钢管公称直径是公制mm为基准的，称 DN (metric unit)。 其实仔细一算钢管 …

2020年4月11日 · In the inch system, nominal bore is abbreviated as NB; in metric systems, it is “diameter nominal” (DN), or Nominal Pipe Size (NPS) in North America. So, how does all this help us when purchasing a pipe support system?

2024年9月2日 · Explore the differences between Nominal Pipe Size (NPS), Nominal Bore (NB), and Nominal Diameter (DN). This post breaks down how these pipe sizing standards compare and how to choose the right one for your project.

2024年8月22日 · The diameter of the pipe is generally divided into nominal diameter, inner diameter and outer diameter. ND and bore diameter are two important parameters in the pipeline industry and manufacturing field. ND are metric mm (DN) and NB (inch unit). It is often used to describe the dimensions of holes, pipes and mechanical parts.

2022年11月17日 · While NB is European and DN is a standard from the metric unit system, NPS is the American Standard of Pipe Size Notation. NPS provides information relating to the outside diameter of the pipe, NB relates to the interior diameter of the pipe, and DN is neither connected to the outer nor the internal diameter of the pipe but is near to it.

①nb、nc篇对坡口有表面检测（pt或mt）的要求，而nd篇没有要求； ②nb篇对于全焊透角接接头连接直径（dn＞100mm）的支管和管道连接件的d类接头有rt检测的要求，nc篇没有要求；nd篇不强调一定做rt检测，可做pt/mt；

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