DN (Diameter Nominal) bisobanura diameter nominal ya pipe, ni ikigereranyo cya diameter yo hanze na diameter y'imbere. Agaciro ka DN = agaciro ka De -0.5 * agaciro k'urukuta rw'igitereko. Icyitonderwa: Iyi ntabwo ari diameter yo hanze cyangwa diameter y'imbere.

Amazi, umuyoboro wa gazi wohereza ibyuma (umuyoboro wibyuma cyangwa umuyoboro wicyuma udafite ingufu), umuyoboro wibyuma, umuyoboro wibyuma-plastike hamwe numuyoboro wa polyvinyl chloride (PVC), nibindi, ugomba gushyirwaho diameter nominal "DN" (nka DN15, DN50).

De.

D muri rusange bivuga diameter y'imbere y'umuyoboro.

d muri rusange bivuga diameter y'imbere y'umuyoboro wa beto. Imiyoboro ya beto (cyangwa beto) ishimangiwe, imiyoboro yibumba, imiyoboro ya ceramic irwanya aside, amabati ya silinderi nindi miyoboro, diameter ya pipe igomba guhagararirwa na diameter y'imbere d (nka d230, d380, nibindi)

Φ byerekana umurambararo w'uruziga rusanzwe; irashobora kandi kwerekana diameter yinyuma yumuyoboro, ariko iki gihe igomba kugwizwa nubunini bwurukuta.