He aha kaʻatikala nominal?

ʻO ka'ōlelo maʻamau, ke hoʻokaʻawaleʻana o ka diameter o ka paipa i waho (de), i loko o ka diameter (d).
Ma lalo e hāʻawi iāʻoe i kahiʻokoʻa ma waena o kēia "D, D, DN"ʻokoʻa.

Dn ka diameter nominal o ka paipa

MEA KAHAKAU:ʻAʻoleʻo ia ka mea o waho o ka diameter a me ka nui o ka nui; pono e pili ana i ka ulu muaʻana o ka pākeke o ka papeline a me nā hui imperial; Hoʻohana pinepineʻia e wehewehe i nā pila pila galvanized, e pili ana i nā'āpana imperial e like me:

4-VIEP PLAY: 4/8 inch: dn15;
6-minuke papa: 6/8 inch: dn20;
1 Inch port: 1 ich: DN25;
Inch fla paila: 1 a me 1/4 iniha: dn32;
Half-Inch PLAC PLA: 1 a me 1/2 iniha: DN40;
ʻElua mau pīpī ipo i 2 iniha: DN50;
Ekolu-Inch Ppuard: 3 mau iniha: DN80
ʻEhā-inch paipa: 4 iniha: dn100;
Wai, ka hau uilanā kīleʻa pipalapaʻo galvana iʻole ka pipe pipe), lele i nā paila paila hao,ʻo ches plastict composite, pono e hōʻailonaʻia me nā mea hou "fn", dn8, dn20).

 

De ka mea nui e pili ana i ka diameter o waho o ka paipa
Hoʻohana nui o ka hoʻohanaʻana o ka hana, pono e kāʻiliʻia i keʻano o kahiʻano o ka lole o waho;

Hoʻohana nuiʻia e wehewehe:ʻO ka paila kila kila, PVC a me nāʻili'ē aʻe a me nāʻili'ē aʻe, a me nāʻili'ē aʻe e pono ai i kahi mānoanoa o ka pā.
E lawe i ka pipa Galvanized Galvalized ma keʻano he kumu hoʻohālike, me DN, DENʻelua mau hana hanaʻelua:
Dn20 de25 × 2.5mm
Dn25 d32 × 3mm
Dn32 de40 × 4mm
Dn40 de50 × 4mm

......

 

D nā mea maʻamau e pili ana i ka diameter o loko o ka paipa, d e hōʻike i ka pā o ka pali o ka paila, aʻo φ e hōʻike ana i keʻano o kahiʻano maʻamau

Φ Hiki i keʻano o ka laulā o waho o ka paipa, akā e hoʻonuiʻia e ka pāpū kiʻekiʻe.
No ka laʻana, `222 × 3ʻo ia ka paila me kahi pipe ma waho o 25mm a me kahi pā ma kahi o 3mm.
Seamless Steel pipe a iʻole nā ​​paila paila haoʻole, pono e hōʻailonaʻia "i waho
No ka laʻana: φ107 × 4, ma hea o φ.
ʻO China, Iso a me ka hapa o kaʻaoʻao o ka paila kila e hoʻohana ana i nā'āpana nui e hōʻike i ka paila o ka paila. No kēiaʻano o ka paila Steel pipe, keʻano o ka hōʻikeʻana no ka paipu ma waho o Diameter No ka laʻana: φ660.5 × 3.8

De, dn, d, very of the recount o ka hōʻike!
De-- PPR, PE POOP, polyPylele pi pi
Dn - TonlyTykalane (pvc) pipe, keka nei i ke alanui Vamet Komii, Gaelvative Nekishin Namither
D - Hoʻonohonohoʻia Paip Pahu Na Manaonawa
ʻO ke kumu kūʻaiʻo ф - nā kīleʻa fia0