Enkoragana ahagati y‘ebirikworeka DN, Φ na inci.

Ekirikumanyisa “inch”: Inch (“) n’ekicweka ky’okushoboorora ekirikukoresibwa omu nkora ya America, nk’emipiira y’ekyoma, valve, flanges, elbows, pampu, tees, n’ebindi, nk’okushoboorora kuri 10′′.

Incies (inch, omubugufu nka in.) nikimanyisa ekikumu omu Rudaaki, kandi inci emwe n’oburaingwa bw’ekikumu. Buzima, oburaingwa bw’ekikumu ky’omuntu nabwo nibutandukaana. Omu kyasha kya 14, Omugabe Edward II akashohoza “inci y’ebiragiro erikugyenderwaho”.

Nikiteebwaho ngu oburaingwa bw’embibo ishatu ezihango ezitoorainwe kuruga ahagati y’okutu kwa sayiri kandi zitebeekanisiibwe omu murongooti ni inci emwe.

Okutwarira hamwe 1′′=2.54cm=25.4mm

DN n‘enki: DN n‘ekicweka ky‘okushoboorora ekirikukoresibwa munonga omu nkora z‘Abachaina n‘Abanyaburaaya. Kandi n’ekihandiiko ky’okumanyisa emipiira, valvu, flanges, ebikwato by’okutaho emipiira n’empampu, nka DN250.

DN neemanyisa diamita y’eiziina y’omupiira (erikumanywa nka diamita y’eiziina), manya: egi ti diamita y’aheeru nari diamita y’omunda, n’omubaro gw’ahagati gw’oburaingwa bw’aheeru n’omunda, ogurikwetwa omubaro gw’omunda ogwagati.

Eki Φ kiri: Φ n’ekicweka ky’omutaano, ekirikumanyisa oburaingwa bw’aheeru bw’emipiira, ebikumu, ebyoma ebirikwetoorora n’ebindi bintu. Kandi nikibaasa kugambwa ngu n’ekya diamita. Nk’eky’okureeberaho, Φ609.6mm nikimanyisa oburaingwa bw’aheeru bwa 609.6mm.

Hati nk’oku twamanyire eki ebicweka ebi bishatu birikujwekyera, ni kakwate ki akari ahagati yaabyo?

Eky’okubanza, “Amakuru ga “DN” nigashushana n’aga DN, omu kubanza nigamanyisa diamita y’eiziina, erikworeka obuhango bw’okushoboorora oku, kandi Φ n’okugaita ebi byombi.

Nk’eky’okureeberaho: omupiira gw’ekyoma gwaba guri DN600, kandi omupiira nigwo gumwe gw’ekyoma guhandiikirweho inci, niguhinduka 24′′. Hariho akakwate ahagati y’ebintu ebi byombi?

Eky’okugarukamu ni eego! Inci y’omutaano n’okukanyisa omubaro gw’omutaano oguhikire na 25, ogurikwingana na DN, nka 1′′*25=DN25 2′′*25=50 4′′*25=DN100 n’ebindi.

N’amazima, hariho n’ebindi ebitarikushushana, nka 3′′*25=75, okwehinguririza kuhika ahari DN80 eri haihi, na inci ezimwe eziine obubonero bwa semikoloni nari obubonero bwa decimal, nka 1/2′′ 3/4′′ 1-1/4′′ 1-1/2′′ 2-1 /-31/2 ezi tizirikubaasa kuba, n’ebindi. kubarwa nk'okwo, kwonka okubara ni nk'oku kumwe, okukira munonga omuhendo ogurikworekwa:

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