Isano iri hagati ya DN, Φ na santimetero.

Niki "inch": Inch (") nigice gisanzwe cyerekana sisitemu y'Abanyamerika, nk'imiyoboro y'ibyuma, indangagaciro, flanges, inkokora, pompe, tees, nibindi, nkibisobanuro ni 10 ″.

Inches (santimetero, mu magambo ahinnye nko muri.) bisobanura igikumwe mu giholandi, naho santimetero imwe ni uburebure bw'igikumwe. Nibyo, uburebure bwintoki yumuntu nabwo buratandukanye. Mu kinyejana cya 14, Umwami Edward II yatanze "intambwe isanzwe yemewe".

Hateganijwe ko uburebure bwibinyampeke bitatu binini byatoranijwe hagati y ugutwi kwa sayiri kandi butondekanye kumurongo ni santimetero imwe.

Mubisanzwe 1 ″ = 2.54cm = 25.4mm

DN ni iki: DN nigice gikunze gukoreshwa muri sisitemu yubushinwa nu Burayi. Nibisobanuro kandi byerekana imiyoboro, indangagaciro, flanges, imiyoboro ya pompe na pompe, nka DN250.

DN bivuga diameter nominal ya pipe (izwi kandi nka diameter nominal), icyitonderwa: iyi ntabwo ari diameter yo hanze cyangwa diameter y'imbere, ni impuzandengo ya diameter yo hanze na diameter y'imbere, bita impuzandengo y'imbere.

Niki Φ: Φ nigice rusange, bivuga diameter yo hanze yimiyoboro, inkokora, ibyuma bizunguruka nibindi bikoresho. Birashobora kandi kuvugwa ko ari diameter. Kurugero, Φ609.6mm bivuga diameter yo hanze ya 609.6mm.

Noneho ko tumaze kumenya icyo ibi bice bitatu byerekana, ni irihe sano riri hagati yaryo?

Mbere ya byose, "Ubusobanuro bwa" DN "burasa nubwa DN, mubyukuri bivuze diameter nominal, byerekana ubunini bwibi bisobanuro, kandi Φ ni uguhuza byombi.

Kurugero: niba umuyoboro wicyuma ari DN600, kandi umuyoboro umwe wicyuma urangwa na santimetero, biba 24 ″. Haba hari isano hagati yabyo bombi?

Igisubizo ni yego! Ubusanzwe santimetero nigwiza ryuzuye rya integer kuri 25, bingana na DN, nka 1 ″ * 25 = DN25 2 ″ * 25 = 50 4 ″ * 25 = DN100 nibindi.

Birumvikana ko hari nibindi bitandukanye, nka 3 ″ * 25 = 75, bizengurutse DN80 ikwegereye, hamwe na santimetero zimwe na semicolon cyangwa ingingo icumi, nka 1/2 ″ 3/4 ″ 1-1 / 4 ″ 1 -1/2 ″ 2-1 / 2 ″ 3-1 / 2 ″, nibindi, ibi ntibishobora kubarwa gutya, ariko kubara ni bimwe, mubyukuri agaciro kerekanwe:

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