DN (nominal diameter) zvinoreva kuti zita remazwi remapipi, iro riri pakati pekunze diameter uye dhayamu yemukati. Iko kukosha kweDN = kukosha kweDe -0.5 * kukosha kwe tube wall bliketness. Ongorora: Iyi haisi iyo yekunze dhayamu kana iyo yemukati mehudyu.

Mvura, Gasi Kutumira Simbi Pombi (Gallvaned Steel pombi kana isina-baranized pombi , Dn50).

De (Oparty Interner) zvinoreva kuti Outer yePombi, PPR, Pepa Pipe Pipe Outer Onder .

D kazhinji inoreva mutsara wemukati weiyo pombi.

D kazhinji inoreva iyo yemukati meyamita yeiyo kongiri pombi. Yakasimbiswa kongiri (kana kongiri) pombi, clay pombi, acid-inodzivirira ceramic mapaipi, iyo pombi yedhisheni yedhisheni d (yakadai seD230, D380, etc.)

Φ inomiririra dhayiti yedenderedzwa rakajairika; Inogona zvakare kumiririra iyo yekunze dhaya yeiyo pombi, asi panguva ino inofanira kuwedzerwa nemadziro emadziro.