Kuyini “intshi”: Intshi (“) iyunithi yokucaciswa evamile yesistimu yaseMelika, njengamapayipi ensimbi, amavalvu, ama-flange, izindololwane, amaphampu, ama-tee, njll., njengokucaciswa kokuthi 10″.
Intshies (intshi, esifushanisiwe njenge-in.) isho isithupha ngesi-Dutch, futhi iyintshi eyodwa ubude besithupha.Yebo, ubude besithupha somuntu buhlukile.Ngekhulu le-14, iNkosi u-Edward II yakhipha "intshi evamile yezomthetho".
Kushiwo ukuthi ubude bezinhlamvu ezintathu ezinkulu kakhulu ezikhethwe phakathi kwesikhwebu sebhali futhi zihlelwe ngokulandelana ziyi-intshi eyodwa.
Ngokuvamile 1″=2.54cm=25.4mm
Iyini i-DN: I-DN iyunithi yokucacisa evame ukusetshenziswa ezinhlelweni zamaShayina nezaseYurophu.Kuphinde kube nokucaciswa kokuhlonza amapayipi, ama-valve, ama-flange, ukufakwa kwamapayipi namaphampu, njenge-DN250.
I-DN ibhekisela kububanzi obujwayelekile bepayipi (okwaziwa nangokuthi i-diameter yegama), qaphela: lokhu akuwona ububanzi bangaphandle noma ububanzi obungaphakathi, isilinganiso sobubanzi obungaphandle kanye nobubanzi obungaphakathi, okubizwa ngokuthi i-diameter yangaphakathi evamile.
Kuyini u-Φ: Φ iyunithi evamile, ebhekisela kububanzi obungaphandle bamapayipi, izindololwane, insimbi eyindilinga nezinye izinto.Kungabuye kushiwo ukuthi ububanzi.Isibonelo, Φ609.6mm ibhekisela kububanzi obungaphandle obungu-609.6mm.
Manje njengoba sesitholile ukuthi la mayunithi amathathu amele ini, yini ukuxhumana phakathi kwawo?
Okokuqala nje, “Incazelo ye-“DN” icishe ifane naleyo ye-DN, ngokuyisisekelo isho ububanzi obuncane, okubonisa ubukhulu balokhu kucaciswa, futhi u-Φ uwukuhlanganisa kokubili.
Isibonelo: uma ipayipi lensimbi lingu-DN600, futhi ipayipi lensimbi elifanayo limakwe ngamayintshi, liba ngu-24″.Ingabe kukhona ukuxhumana phakathi kwalokhu okubili?
Impendulo ithi yebo!I-intshi evamile ukuphindaphinda okuqondile kwenombolo ngo-25, okulingana ne-DN, njengokuthi 1″*25=DN25 2″*25=50 4″*25=DN100 nokunye.
Vele, kukhona futhi ahlukile, njengokuthi 3″*25=75, azungezwe ku-DN80 eseduze, nama-intshi athile anamasemicolon noma amaphoyinti edesimali, njengokuthi 1/2″ 3/4″ 1-1/4″ 1 -1/2″ 2-1 /2″ 3-1/2″, njll., lezi azikwazi ukubalwa kanjalo, kodwa izibalo zicishe zifane, ngokuyisisekelo inani elishiwo:
1/2″=DN15 3/4″=DN20 1-1/4″=DN32 1-1/2″=DN40 2-1/2″=DN65 3-1/2″=DN90
Isikhathi sokuthumela: Mar-10-2022