预埋套管中的DN是什么意思?例如DN600一般要安装多大直径的套管,而需要通过套管的直径有什么多少?求详 dn600防水套管的DN是什么意思
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关于管道标识中DN的定义,在国家标准《GB/T 1047-2005 管道元件DN(公称尺寸)的定义和选用》中有明确解释:代号后的数字只是个参考,不代表外径也不代表内径,不能用来计算。
不过,如不是准确计算,根据经验可以估计出内外径,方法是:将这个数字当做壁厚中心线的值,例如DN600的钢管,壁厚20,那么可估算出其外径=600+20=620、其内径=600-20=580。DN既不是外径也不是内径,而是指管道的公称直径。
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