[必看]：DN的来源和De的意义

cynthia

The pipe's dimensions are set by the American National Standards Insitute.

Wall thickness varies with schedule number, but the outside diameter remains constant for 14 inch (35.5 cm) diameter and over. As the thickness changes, the inside diameter is altered. To call out a pipe, it is necessary to give both the schedule number and the weight/strength designation for both pipes and fittings.

All pipes under 14 inch (35.5cm) in diameter are designated by the nominal inside diameter and schedule number.

Those over 14inch (35.5cm) are disignated by the actual outside diameter and thickness of walls.

The pipe sizes from 1/8 inch to 12 inch (0.31 to 0.34cm) are shown by the nominal inside diameter (which is different from the actual inside diameter). The inside diameter and the outside diameter will vary with the schedule number from 1/8 inch to 12 inch (0.31 to 0.34cm) diameters and the nominal size will equal the outside diameter from 14 to 42 inch (35.5 to 106.6cm).

The DN means nominal diameter of a pipe. The De means external diameter of a pipe.

美女蛇

DN表示公称直径，De表示外径。De用于PVC、PCR、PE较多。

孤鸿多情

还是美女蛇好啊，楼主的英文我看不懂啊！我笨！

chenhang1203

管子的尺寸被美国人国家的标准Insitute放置。

墙壁厚度随着时间表数字变化，但是关于14英寸( 35.5 cm )直径的outisdse直径残余常量和结束。 当被改变时厚度变化，在直径内部。 为了大声喊叫一piep，为了管子和试穿给时间表muber和重量与力量指派是必要。

所有在直径中的14英寸( 35.5cm )下的管子被在直径和时间表数字内部的名义指定。

超过14inch ( 35.5cm )的那些通过在直径和厚度之外的实际disignated。

从1/8英寸到12英寸( 0.31 0.34cm )的管子大小被在直径的(不同于在直径)内部的实际内部的名义显示。 在直径和外面直径内部将随着从1/8英寸的时间表数字变化成为12英寸( 0.31 0.34cm )直径，而名义的大小将与外面直径从14到42英寸( 35.5 106.6cm )等于。

willwong

还不如不翻译

孤鸿多情

四楼翻译得确实比较差啊！看得不大明白！

美女蛇

好像是用东方快车之类即时汉化软件翻译的，语句不通，更不用说专业术语了。

linj

是英语的东西。