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管道的工程直徑、內徑和外徑的聯系

作(zuo)者: 日期(qi):2023-04-17

很多客戶買了之后(hou)(hou)對(dui)于口徑(jing)(jing)(jing)和(he)管(guan)路之間(jian)有很多的(de)疑惑,為了讓大家能理清直徑(jing)(jing)(jing)和(he)內徑(jing)(jing)(jing),法蘭外徑(jing)(jing)(jing)的(de)關系。首先,公稱通(tong)徑(jing)(jing)(jing)是管(guan)路系統中所(suo)有管(guan)路附件用(yong)數字(zi)表(biao)示的(de)尺寸(cun),公稱通(tong)徑(jing)(jing)(jing)是供參考用(yong)的(de)一(yi)個(ge)方便(bian)的(de)圓整數,與加工(gong)尺寸(cun)僅呈不嚴格的(de)關系。公稱通(tong)徑(jing)(jing)(jing)用(yong)字(zi)母“DN”后(hou)(hou)面緊跟一(yi)個(ge)數字(zi)標志。
公稱(cheng)通徑(nominal diameter),又稱(cheng)平均(jun)外(wai)徑(mean outside diameter)。
這是緣自金屬管(guan)的管(guan)璧(bi)很(hen)薄,管(guan)外徑與管(guan)內徑相差(cha)無幾,所以取管(guan)的外徑與管(guan)的內徑之(zhi)平均值當作管(guan)徑稱呼。 
DN是公(gong)(gong)(gong)稱(cheng)(cheng)(cheng)通徑(jing),公(gong)(gong)(gong)稱(cheng)(cheng)(cheng)通徑(jing)(或(huo)叫公(gong)(gong)(gong)稱(cheng)(cheng)(cheng)直徑(jing)),就是各種管(guan)子與管(guan)路附(fu)件的通用口(kou)徑(jing)。同一公(gong)(gong)(gong)稱(cheng)(cheng)(cheng)直徑(jing)的管(guan)子與管(guan)路附(fu)件均能(neng)相互(hu)連接,具有互(hu)換(huan)性它不(bu)是實際(ji)意義上(shang)的管(guan)道(dao)外徑(jing)或(huo)內徑(jing),雖然其(qi)數值跟管(guan)道(dao)內徑(jing)較為接近或(huo)相等; 
為(wei)了使(shi)管(guan)(guan)(guan)(guan)(guan)子、管(guan)(guan)(guan)(guan)(guan)件連接尺寸(cun)(cun)統一(yi),采(cai)用公(gong)(gong)(gong)(gong)稱(cheng)直徑(也(ye)稱(cheng)公(gong)(gong)(gong)(gong)稱(cheng)口徑、公(gong)(gong)(gong)(gong)稱(cheng)通(tong)徑)。例如焊接鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)按(an)厚度可分為(wei)薄壁(bi)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、普通(tong)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)和加(jia)厚鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。其公(gong)(gong)(gong)(gong)稱(cheng)直徑不(bu)是外徑,也(ye)不(bu)是內(nei)徑,而是近似普通(tong)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)內(nei)徑的一(yi)個名義尺寸(cun)(cun)。每(mei)一(yi)公(gong)(gong)(gong)(gong)稱(cheng)直徑,對應一(yi)個外徑,其內(nei)徑數值隨厚度不(bu)同(tong)而不(bu)同(tong)。公(gong)(gong)(gong)(gong)稱(cheng)直徑可用公(gong)(gong)(gong)(gong)制mm表(biao)示,也(ye)可用英制in表(biao)示。管(guan)(guan)(guan)(guan)(guan)路(lu)附件也(ye)用公(gong)(gong)(gong)(gong)稱(cheng)直徑表(biao)示,意義同(tong)有(you)縫管(guan)(guan)(guan)(guan)(guan)。
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