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常用管道公称直径和外径对照管道公称直径管子外径外套管规格保温层厚度（mm）长度（m）DN1518DN2025DN2532DN3238DN4045DN5057603.01252.5306DN6576763.01403.029.56DN8089894.01603.032.56DN1001081144.02003.239.86DN1251331404.52253.5396DN1501591654.52503.938.66DN2002192196.03154.943.112DN2502732736.03655.640.412DN3003253257.04207.040.512DN3503773777.05007.853.712DN4004264267.05508.853.212DN4504804787.06008.852.212DN5005305298.06559.853.212DN6006306308.07601153.912DN7007207209.0850125312DN80082082010.0960135712DN90092092010.01054145312DN1000102010201211551453.512DN120012201220121380156512DN14001420