Kuyini i- "inch": Intshi (") iyunithi elijwayelekile lokucacisa lohlelo lwaseMelika, njengamapayipi ensimbi, ama-valve, ama-flanges, ama-elbows, amaphampu, ama-tues, njll, okufana nalokhu kungu-10".
Umuthi ophakathies (intshi, ifushanisiwe njengase.) Kusho isithupha ngesiDashi, futhi i-intshi eyodwa ubude besithupha. Vele, ubude besithonjana somuntu buhlukile. Ngekhulu le-14, iKing Edward II yakhipha "ama-inch ajwayelekile asemthethweni".
Kuchazwa ukuthi ubude bama-srains amathathu amakhulu akhethiwe kusukela maphakathi nendlebe futhi kuhlelwe ngokulandelana kuyinto eyodwa intshi.
Ngokuvamile 1 "= 2.54cm = 25.4mm
Yini i-DN: I-DN iyunithi esetshenziswa kaningi yezinhlelo zamaShayina naseYurophu. Kubuye kube yincazelo yokuhlonza amapayipi, ama-valve, ama-flanges, ukufakwa kwamapayipi namaphampu, njenge-DN250.
I-DN isho ububanzi bepayipi (owaziwa nangokuthi ububanzi obukhohlisayo), Qaphela: lokhu akulona ububanzi obungaphandle noma ubukhulu obungaphakathi, kuyisilinganiso sobubanzi obungaphandle kanye nobubanzi obungaphakathi, obubizwa nge-average wangaphakathi.
Yini φ: φ iyiyunithi ejwayelekile, ebhekisa kububanzi obungaphandle kwamapayipi, ama-elbows, insimbi eyindilinga nezinye izinto. Kungashiwo futhi ububanzi. Isibonelo, φ609.6mm kubhekisele kububanzi obungaphandle ka-609.6mm.
Manje njengoba sesicabangele ukuthi la mayunithi amathathu amelelani, kungukuphi ukuxhumana phakathi kwawo?
Okokuqala, "okushiwo" i-DN "kucishe kufane naleyo ye-DN, ngokuyisisekelo kusho ububanzi bokuqamba, okubonisa usayizi wale ncazelo, futhi φ ukuhlanganisa lezi ezimbili.
Isibonelo: Uma ipayipi lensimbi liyi-DN600, kanti ipayipi elifanayo lensimbi limakwe ngamasentimitha, liba ngu-24 ". Ingabe kukhona ukuxhumana phakathi kwalokhu okubili?
Impendulo inguyebo! I-intshi ejwayelekile yiyona eqondile yokuphindaphindwa kwenombolo nge-25, elingana ne-DN, efana ne-1 "* 25 = 50 = 50 = DN100 njalonjalo.
Kuyiqiniso, kukhona futhi okuhlukile, okufana ne-3 "* 25 = 75, okuzungezwe ku-DN80 esiseduzane, kodwa amaphuzu angu-3/1 / 2", njll.
1/2 "= DN15 3/4" = DN20 1-1 / 4 "= DN32 1-1 / 2" = DN65 3-1 / 2 "= DN90
Isikhathi sePosi: Mar-10-2022
