"Inchi" ni iki: Inchi (“) ni igikoresho gisanzwe gikoreshwa mu kugena imiyoboro y'icyuma, valves, flanges, inkokora, pompes, tees, nibindi, nk'uko imiterere yabyo ari santimetero 10.
Incheses (inchi, mu magambo ahinnye nka in.) bivuze igikumwe mu Giholandi, naho santimetero imwe ni uburebure bw'igikumwe. Birumvikana ko uburebure bw'igikumwe cy'umuntu nabwo butandukanye. Mu kinyejana cya 14, Umwami Edward wa II yasohoye "inchi isanzwe yemewe n'amategeko".
Bivugwa ko uburebure bw'ibinyampeke bitatu binini byatoranijwe hagati mu gishishwa cya sayiri kandi bitondetse ku murongo ari santimetero imwe.
Muri rusange 1″=2.54cm=25.4mm
DN ni iki: DN ni igikoresho gikoreshwa cyane mu buryo bw'ibipimo mu Bushinwa no mu Burayi. Ni kandi igikoresho cyo kumenya imiyoboro, valve, flanges, fittings z'imiyoboro na pompe, nka DN250.
DN yerekeza ku murambararo w’umuyoboro (uzwi kandi nka umurambararo w’umuyoboro), icyitonderwa: uyu si umurambararo w’inyuma cyangwa umurambararo w’imbere, ni impuzandengo y’umurambararo w’inyuma n’umurambararo w’imbere, witwa umurambararo w’imbere mpuzandengo.
Φ ni iki: Φ ni igice rusange, kivuga umurambararo w'inyuma w'imiyoboro, inkokora, icyuma kizingiye n'ibindi bikoresho. Nanone gishobora kuvugwa ko ari umurambararo. Urugero, Φ609.6mm bivuga umurambararo w'inyuma wa 609.6mm.
None se ko tumaze kumenya icyo ibi bice bitatu bihagarariye, ni iyihe sano iri hagati yabyo?
Mbere na mbere, "Igisobanuro cya "DN" ni hafi kimwe n'icya DN, mu by'ukuri bivuze umurambararo w'izina, bigaragaza ingano y'iyi ngingo, naho Φ ikaba ari uguhuza ibyo byombi.
Urugero: niba umuyoboro w'icyuma ari DN600, kandi umuyoboro w'icyuma umwe ukaba warashyizweho ikimenyetso cya santimetero, uba santimetero 24. Ese hari isano iri hagati y'ibyo byombi?
Igisubizo ni yego! Isenti rusange ni ukwikuba kw'intege nke na 25, bingana na DN, nka 1″*25=DN25 2″*25=50 4″*25=DN100 n'ibindi.
Birumvikana ko hari n'izindi zitandukanye, nka 3″*25=75, zizengurutswe kuri DN80 yegereye, na santimetero zimwe na zimwe zifite semicolons cyangwa amanota ya decimal, nka 1/2″ 3/4″ 1-1/4″ 1-1/2″ 2-1 /2″ 3-1/2″, n'ibindi, ibi ntibishobora kubarwa gutyo, ariko ibarwa ni rimwe, muri rusange agaciro kagenwe:
1/2 ″ = DN15 3/4 ″ = DN20 1-1 / 4 ″ = DN32 1-1 / 2 ″ = DN40 2-1 / 2 ″ = DN65 3-1 / 2 ″ = DN90
Igihe cyo kohereza ubutumwa: Werurwe-10-2022
