Yini i-intshi, yini i-DN, futhi yini u-Φ?

Yini iyintshi:

I-intshi (“) iyunithi yokulinganisa evame ukusetshenziswa kusistimu yaseMelika, njengamapayipi, amavalvu, ama-flange, amandololwane, amaphampu, ama-tee, njll. Isibonelo, usayizi ongu-10″.

Igama elithi intshi (elifushanisiwe ngokuthi “ngaphakathi.”) ngesiDashi ekuqaleni lalisho isithupha, futhi intshi ubude bengxenye eyodwa yesithupha.Yebo, ubude besithupha somuntu bungahluka.Ekhulwini le-14, iKing Edward II yaseNgilandi yakhipha “intshi engokomthetho evamile.”Incazelo yawo yayiwukuthi: ubude bezinhlamvu ezintathu zebhali ezinkulu, ezibekwe ekugcineni.

Ngokuvamile, 1″=2.54cm=25.4mm.

Yini i-DN:

I-DN iyunithi yokulinganisa esetshenziswa kakhulu e-China naseYurophu, futhi isetshenziselwa ukukhombisa imininingwane yamapayipi, ama-valve, ama-flange, okokufakwayo, amaphampu, njll., njenge-DN250.

I-DN ibhekisela kububanzi obujwayelekile bepayipi (owaziwa nangokuthi i-bore yegama).Sicela uqaphele ukuthi lokhu akuwona ububanzi bangaphandle noma ububanzi bangaphakathi, kodwa isilinganiso sawo womabili amadayamitha, aziwa ngokuthi i-diameter emaphakathi.

Yini Φ:

Φ iyunithi evamile yokulinganisa esetshenziselwa ukukhombisa ububanzi bangaphandle bamapayipi, ukugoba, imigoqo eyindilinga, nezinye izinto zokwakha, futhi ingase isetshenziselwe ukubhekisela kububanzi ngokwawo, obufana no-Φ609.6mm okubhekisela kububanzi obungaphandle obungu-609.6 mm.