Mmekọrịta dị n'etiti nkọwa nke DN, φ na inchch.

Kedu ihe bụ "inch": inch (") dị ka ngalaba nkọwapụta maka usoro America, dị ka ọkpọkọ ọkpọ, vanves, flanpows, usg, wdg.

Inches (inch, kwadoro dị ka in.) pụtara mkpịsị aka ukwu n'asụsụ Dutch, otu inch bụ ogologo isi mkpịsị aka ukwu. N'ezie, ogologo nke isi mkpịsị aka mmadụ dịkwa iche. Na narị afọ nke 14, Eze Edward nke Abụọ nyere 'inchkpụrụ Instch'.

A na-ekwuputa na ogologo nke mkpụrụ ọka atọ kachasị ibu ahọrọ n'etiti a na-ege mmanya ma hazie n'usoro bụ otu inch.

N'ozuzu 1 "= 2.54cm = 25.4mm

Kedu ihe bụ DN: DN bụ ngalaba nke na-ejikarị na China na European Systems. Ọ bụkwa nkọwapụta maka ịchọpụta pipes, valves, flanges, fittings pipe na nfuli, dịka DN250.

DN na-ezo aka na dayameta nke ọkpọkọ (a makwaara dị ka dayameta nke ọkwa), nke a abụghị dayameta dị n'ime, ọ bụ nkezi nke dayameta nke dị n'ime, a na-akpọ dayameta ime.

Gịnị bụ φ: φ bụ otu izugbe, nke na-ezo aka na dayameta nke ọkpọkọ, elbows, steel steel na ihe ndị ọzọ. Enwere ike ikwu na ọ bụ dayameta. Dịka ọmụmaatụ, φ609.6mm na-ezo aka na dayameta nke 609.6mm.

Ugbu a anyị chọpụtaworo ihe nkeji atọ a na-anọchi anya ya, gịnị bụ njikọ dị n'etiti ha?

Nke mbụ, "ihe" DN "pụtara bụ otu ihe ahụ nke DN, ihu ọma ọ pụtara dayameta nke nkọwapụta a, na φ bụ ijikọ abụọ.

Iji maa atụ: Ọ bụrụ na nchara pipe bụ DN600, na otu nchara nchara bụ sentimita 24 ". There nwere njikọ dị n'etiti ha abụọ?

Azịza ya bụ ee! General inch bụ mutalication nke integer nke 25, nke dị ka 1 "= DN25 2" 4 = 25 = DN100 na ndị ọzọ.

N'ezie, enwere ndị dị iche iche, dị ka 3 "* 25 = 75, gbara ya gburugburu 1-1 / 2" 3/4 "3/4" 3/4 "

1/2 "= DN15 3/4" = DN20 1-1 / 3 "= DN40 2-1 / 2" 3-1 / 2 "= DN90