He aha ka NPT thread?
ʻO ka NPT no ka National Pipe Taper, kahi maʻamau US no nā kaula tapered i hoʻohana ʻia ma nā paipu a me nā paipu paipu no ke kumu o ke sila. Hoʻolālā ʻia nā kaula NPT e hāʻawi i kahi sila leak-free i ka wā i hoʻohana ʻia me kahi sealant thread, e like me Teflon tape a i ʻole pipe dope. ʻO ka taper ma kahi kaula NPT e hiki iā ia ke hana i kahi sila ke hoʻopili ʻia me kahi kaula liʻiliʻi ʻē aʻe.
ʻO nā hiʻohiʻona koʻikoʻi o nā kaula NPT:
1. Lihi:E emi iki ana ke anawaena o waho (OD) o ka milo mai ka hoomaka ana a i ka hope o ke kaula. ʻO kēia taper, maʻamau 1/16 iniha no ka ʻīniha, kōkua i ka hana ʻana i kahi sila paʻa i ka wā e paʻa ai nā ʻāpana.
2. Huina Angle: He 60-degere ke kihi o ka milo NPT, e like me ka nui o na loina wiliwili e ae, aka, ua hana pono ia ke ano a me ka hakahaka no na pili paipu.
3. Pitch: ʻO ka pitch (helu o nā milo i kēlā me kēia ʻīniha) ʻokoʻa ma muli o ka nui o ka paipu inoa. No ka laʻana, he 1/8-ʻīniha NPT he 27 mau kaula no ka ʻīniha, aʻo ka 2-ʻīniha NPT he 11.5 mau kaula no ka ʻīniha.
4. Sila:No ka hōʻoiaʻiʻo ʻana i kahi sila kūpono, pono e hoʻohana ʻia kahi sealant thread. Me ka ʻole o ia mea, nui ka liʻiliʻi no ka mea ʻaʻole hiki i ka hoʻopili metala-i-metala wale nō ke hana i kahi sila lawa.
5. Hoʻopaʻa lima:Pono e hoʻopaʻa lima mua ʻia nā kaula NPT, a laila hāʻawi ʻia i nā huli hou me kahi wīwī e loaʻa ai ke sila kūpono. ʻO ka helu o nā huli hou e pili ana i ka nui o ke kūpono a me nā mea; ʻO ka maʻamau, ʻōlelo ʻia ʻo 1.5 a 3.5 ka huli ʻana ma mua o ka paʻa lima.
Hoʻohana pinepine ʻia nā kaula NPT i ka plumbing, hydraulics, a me nā ʻōnaehana pneumatic, a me nā mea ʻē aʻe, kahi e pono ai kahi pilina paʻa, leak-proof. Aia kekahi ʻano hoʻopaʻa maloʻo i kapa ʻia ʻo NPTF (National Pipe Taper Fuel) i hoʻolālā ʻia e hāʻawi i kahi sila mechanical me ka ʻole o ka pono o kahi sealant kaʻawale, ʻoiai e koi ana kekahi mau noi i kahi sealant no ka palekana hou.
No nā nīnau ʻē aʻe e pili ana i nā pono NPT a i ʻole ke koena o kā mākou papa inoa huahana, e ʻoluʻolu e kelepona mai iā mākou.