1、公稱直徑
就是公稱口徑
或叫公稱通徑
或(huo)叫(jiao)公稱尺寸
,哪里來(lai)的區別啊? 2、直徑與口徑在(zai)管道工程
上也沒有區(qu)別的呀。 3、公稱直徑
就(jiu)是各種管子與管路附件的通用口徑。同一(yi)公稱直徑
的管子與管路附件均能(neng)相互(hu)連接(jie),具有(you)互(hu)換性(xing).它不(bu)(bu)是實際意義上的管道外(wai)徑(jing)(jing)或內(nei)徑(jing)(jing),雖然其數值跟管道內(nei)徑(jing)(jing)較為接(jie)近(jin)或相等,是供參考用的一(yi)個(ge)方便的圓(yuan)整數,與加工尺寸僅呈不(bu)(bu)嚴(yan)格的關系。公稱直徑(jing)(jing)不(bu)(bu)是外(wai)徑(jing)(jing),也不(bu)(bu)是內(nei)徑(jing)(jing),而(er)是近(jin)似普通(tong)鋼管內(nei)徑(jing)(jing)的一(yi)個(ge)名義尺寸
。為了使管(guan)(guan)子、管(guan)(guan)件連接尺寸統一(yi),每(mei)一(yi)公(gong)稱直徑,對應(ying)一(yi)個外徑,其內徑數值隨厚度不(bu)(bu)同而不(bu)(bu)同。 3、符(fu)號是(shi)DN,單(dan)位是(shi)毫(hao)米,但(dan)省(sheng)略不(bu)(bu)寫(xie)。也(ye)可用(yong)英(ying)制in表示(shi)。 4、通常公(gong)稱直徑是(shi)對有(you)縫鋼管(guan)(guan)、鑄鐵管(guan)(guan)、混凝土管
等管子的標稱,無縫鋼管
不(bu)用(yong)此表(biao)示(shi)法(fa)(用(yong)外(wai)(wai)徑(jing)*壁厚)不(bu)過就(jiu)(jiu)算你用(yong)了,大家也(ye)(ye)能看明白,個(ge)人(ren)覺得無(wu)所謂(wei)。管(guan)(guan)路(lu)附件也(ye)(ye)用(yong)公稱(cheng)(cheng)直(zhi)徑(jing)表(biao)示(shi),意義同(tong)(tong)(tong)有縫管(guan)(guan)。 5、鋼管(guan)(guan)安裝(zhuang)時無(wu)需換算,因(yin)為(wei)(wei)在(zai)同(tong)(tong)(tong)一(yi)標準里同(tong)(tong)(tong)一(yi)公稱(cheng)(cheng)直(zhi)徑(jing)同(tong)(tong)(tong)一(yi)壓力(li)等級的(de)(de)(de)連(lian)(lian)接(jie)(jie)尺寸相同(tong)(tong)(tong),并且同(tong)(tong)(tong)一(yi)材料(liao)的(de)(de)(de)外(wai)(wai)徑(jing)也(ye)(ye)相同(tong)(tong)(tong),實行公稱(cheng)(cheng)直(zhi)徑(jing)的(de)(de)(de)目(mu)的(de)(de)(de)就(jiu)(jiu)是(shi)為(wei)(wei)了方便連(lian)(lian)接(jie)(jie)性,要(yao)換算的(de)(de)(de)話豈不(bu)是(shi)白實行了嗎。 6、強調(diao): 公稱(cheng)(cheng)直(zhi)徑(jing)即(ji)不(bu)是(shi)管(guan)(guan)的(de)(de)(de)外(wai)(wai)徑(jing),也(ye)(ye)不(bu)是(shi)管(guan)(guan)的(de)(de)(de)內(nei)徑(jing),還不(bu)是(shi)內(nei)外(wai)(wai)徑(jing)的(de)(de)(de)平均(jun)值(設備的(de)(de)(de)公稱(cheng)(cheng)直(zhi)徑(jing)是(shi)指外(wai)(wai)徑(jing))所以說:DN20的鋼管外徑26.75(無縫管外徑一般就是(shi)27)壁(bi)厚2.75(壁(bi)厚2.5或者3.0) 購(gou)買電(dian)話(hua):022-84892002