Yintoni i-intshi, yintoni i-DN, kwaye yintoni Φ?

Yintoni i-intshi:

I-intshi (“) yiyunithi esetyenziswa ngokuqhelekileyo yomlinganiselo kwinkqubo yaseMelika, njengemibhobho, iivalvu, iiflange, iingqiniba, iimpompo, ii tee, njl njl. Umzekelo, ubungakanani be-10″.

Igama elithi intshi (elifinyeziweyo ngokuthi “ngaphakathi.”) ngesiDatshi ntlandlolo lalithetha ubhontsi, kwaye i-intshi bubude becandelo elinye likabhontsi. Kakade ke, ubude bobhontsi bomntu bunokwahluka. Ngenkulungwane ye-14, uKing Edward II waseNgilani wakhupha “umlinganiselo osemthethweni osemthethweni.” Inkcazo yayo yayiyi: ubude beenkozo ezintathu ezinkulu zerhasi, zibekwe ekupheleni.

Ngokubanzi, 1″=2.54cm=25.4mm.

Yintoni i-DN:

I-DN iyiyunithi esetyenziswa ngokuqhelekileyo yokulinganisa e-China naseYurophu, kwaye isetyenziselwa ukubonisa iinkcukacha zemibhobho, i-valve, i-flanges, i-fittings, iimpompo, njl., njenge-DN250.

I-DN ibhekiselele kwidayamitha yesiqhelo yombhobho (ekwaziwa ngokuba yi-nominal bore). Nceda uqaphele ukuba oku akusiyo i-diameter yangaphandle okanye i-diameter yangaphakathi, kodwa i-avareji yazo zombini iidayamitha, ezaziwa njenge-diameter ephakathi.

Yintoni Φ:

Φ yiyunithi eqhelekileyo yokulinganisa esetyenziselwa ukubonisa i-diameter yangaphandle yemibhobho, ukugoba, imivalo engqukuva, kunye nezinye izinto, kwaye ingasetyenziselwa ukubhekisa kwidayamitha ngokwayo, njenge-Φ609.6mm ebhekisa kwidayamitha engaphandle ye-609.6 mm.