Metric, US a me Inch pae maʻamau

ʻO NPT, PT, a me G nā kaula paipu.  

Kū 'o NPT no National (American) Pipe Thread. ʻO ia ka maʻamau ʻAmelika 60-degree taper Pipe Thread i hoʻohana ʻia ma ʻAmelika ʻĀkau. Hiki ke kuhikuhi ʻia ke kūlana aupuni i GB/T12716-1991  

He pōkole ʻo PT no ka Pipe Thread. ʻO ka PT he 55 degere i hoʻopaʻa ʻia i ke kaula paipu conical, he ʻohana wyeth o nā kaula i hoʻopaʻa ʻia, i hoʻohana ʻia ma ʻEulopa a me nā ʻāina Commonwealth. Hoʻohana maʻamau i ka ʻoihana wai a me ke kinoea, ʻo ka taper he 1:16, hiki ke kuhikuhi ʻia ke kūlana aupuni i GB / T7306-2000. 

ʻO G he 55 degere o ke kaula paipu ʻole i hoʻopaʻa ʻia, no ka ʻohana wyeth thread, kaha ʻia ʻo G ma ka inoa o ke kaula cylindrical, hiki ke hāʻawi ʻia ke kūlana aupuni iā ​​GB/T7307-2001.

Eia kekahi, ʻo nā kaha 1/4, 1/2, a me 1/8 i loko o ke kaula, ʻo ia ke anawaena o ka nui o ka milo, ma nā ʻīniha.  

Hoʻohana maʻamau ka poʻe o ka ʻoihana i nā minuke e kāhea i ka nui o ke kaula, ua like ka iniha me 8 mau minuke, 1/4 iniha he 2 mau minuke, a pēlā aku.  

ʻAʻole inoa maʻamau ʻo G no nā kaula paipu (Guan), mai ka ISO maʻamau, e hāʻawi ana i nā kaula paipu cylindrical. ʻO ka mahele o 55 a me 60 degere no ka hana, i ʻike mau ʻia ʻo ka pōʻai paipu. ʻO ia hoʻi, ua mīkini ʻia ke kaula mai ka ʻili cylindrical.  

ʻO ZG ka mea maʻamau i kapa ʻia ʻo tube cone, ʻo ia ke ʻano hōʻailona maʻamau NATIONAL kahiko, ʻo ia hoʻi, ua hana ʻia ke kaula e ka ʻili conical. E like me ka ISO maʻamau, ʻo R ka milo conical waho, ʻo Rc e hōʻike ana i ka milo i loko conical, a ʻo ka Rp e hōʻike ana i ka milo loko cylindrical. 

ʻO ka ʻokoʻa nui ma waena o nā milo metric a me nā milo Pelekania ʻo ia ka helu o nā milo i kēlā me kēia ʻīniha.  

ʻO nā lola metric he 60 degere equilateral, ʻo nā ʻīniha he 55 degere isosceles, a ʻo nā lola ʻAmelika he 60 degere.  

Metric thread in metric units, English thread in inch units.  

Hoʻohana nui ʻia ke kaula paipu e hoʻopili i ka paipu. Ua pili pono nā loina o loko a me waho, me ka paipu pololei a me ka paipu lipi. ʻO ke anawaena nominal e pili ana i ke anawaena o ka pipeline i hoʻohui ʻia, maopopo ka ʻoi aku ka nui o ke anawaena wili ma mua o ke anawaena nominal.  

ʻO 1/4, 1/2, a me 1/8 nā anawaena inoa o nā ʻīniha.