Ubudlelwano phakathi kwezimpawu ze-DN, Φ kanye ne-intshi.

Kuyini “intshi”: I-intshi (“) iyiyunithi yokucacisa evamile yesistimu yaseMelika, njengamapayipi ensimbi, amavalvu, ama-flange, izindololwane, amaphampu, ama-tee, njll., njengoba incazelo ingu-10″.

Intshies (intshi, efingqiwe njengangaphakathi.) isho isithupha ngesiDashi, kanti isentimitha elilodwa ubude besithupha. Yiqiniso, ubude besithupha somuntu nabo buhlukile. Ngekhulu le-14, iNkosi u-Edward II yakhipha "isentimitha ejwayelekile esemthethweni".

Kunqunywe ukuthi ubude bezinhlamvu ezintathu ezinkulu ezikhethwe phakathi kwesikhwebu sebhali futhi ezihlelwe ngokulandelana buyi-intshi eyodwa.

Ngokuvamile 1″=2.54cm=25.4mm

Kuyini i-DN: I-DN iyiyunithi yokucacisa esetshenziswa kakhulu ezinhlelweni zaseShayina nezaseYurophu. Futhi iyincazelo yokuhlonza amapayipi, amavalvu, ama-flange, ukufakwa kwamapayipi namaphampu, njenge-DN250.

I-DN ibhekisela kububanzi obujwayelekile bepayipi (okwaziwa nangokuthi ububanzi obujwayelekile), qaphela: lokhu akusikho ububanzi obungaphandle noma ububanzi obungaphakathi, kuyisilinganiso sobubanzi obungaphandle nobubanzi obungaphakathi, obubizwa ngokuthi ububanzi obuphakathi obujwayelekile.

Kuyini i-Φ: I-Φ iyiyunithi ejwayelekile, ebhekisela kububanzi bangaphandle bamapayipi, izindololwane, insimbi eyindilinga nezinye izinto. Kungashiwo futhi ukuthi ububanzi bayo buyi-diameter. Isibonelo, i-Φ609.6mm ibhekisela kububanzi bangaphandle obuyi-609.6mm.

Manje njengoba sesitholile ukuthi la mayunithi amathathu amele ini, yini ukuxhumana phakathi kwawo?

Okokuqala, “Incazelo ye-“DN” icishe ifane neye-DN, ngokuyisisekelo isho ububanzi obujwayelekile, okubonisa usayizi walesi sichasiselo, kanti i-Φ iwukuhlanganisa lokhu okubili.

Isibonelo: uma ipayipi lensimbi lingu-DN600, futhi ipayipi lensimbi elifanayo limakwe ngamasentimitha, liba ngu-24″. Ingabe kukhona ukuxhumana phakathi kwalokhu okubili?

Impendulo inguyebo! I-intshi ejwayelekile ukuphindaphinda okuqondile kwenani eliphelele ngo-25, okulingana ne-DN, njenge-1″*25=DN25 2″*25=50 4″*25=DN100 njalo njalo.

Vele, kukhona nezinye ezihlukile, njenge-3″*25=75, ezizungezwe ku-DN80 eseduze, kanye nama-intshi athile anama-semicolon noma amaphuzu edesimali, njenge-1/2″ 3/4″ 1-1/4″ 1-1/2″ 2-1 /2″ 3-1/2″, njll., lezi azikwazi ukubalwa kanjalo, kodwa ukubalwa kucishe kufane, ngokuyisisekelo inani elichaziwe:

1/2″=DN15 3/4″=DN20 1-1/4″=DN32 1-1/2″=DN40 2-1/2″=DN65 3-1/2″=DN90