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管道公称直径与外径对照表DN-公称直径Φ－外径大外径系列小外径系列DN15Φ21mmΦ18mmDN20Φ27mmΦ25mmDN25Φ34mmΦ32mmDN32Φ42mmΦ38mmDN40Φ48mmΦ45mmDN50Φ60mmΦ57mmDN65Φ76(73)mmΦ76mmDN80Φ89mmΦ89mmDN100Φ114mmΦ108mmDN125Φ140mmΦ133mmDN150Φ168mmΦ159mmDN200Φ219mmΦ219mmDN250Φ273mmΦ273mmDN300Φ324mmΦ325mmDN350Φ356mmΦ377mmDN400Φ406mmΦ426mmDN450Φ457mmΦ480mmDN500Φ508mmΦ529mmDN600Φ610mmΦ630mm