API threads thiab NPT threads tsis zoo ib yam.Thaum lawv saib zoo ib yam li qhov muag liab qab vim tias ob qho tib si yog tapered, lawv muaj qhov sib txawv geometry thiab tsim los rau cov hom phiaj sib txawv kiag li.
Xyuas kom koj qhov project ua tau raws li API thiab ANSI cov qauv.Saib peb cov ntawv pov thawj xov tshuaj ntsuam xyuas.
NPT Xov yog dab tsi?
NPTsawv rauNational Pipe Taper. Nws yog tus txheej txheem Asmeskas xov rau kev sib txuas - lub hom phiaj kev lag luam thiab pej xeem cov yeeb nkab txuas.
Xov Form:60 degreeV-zoo. Lub crests (saum) thiab cov hauv paus hniav (hauv qab) yog tiaj los yog truncated.
Txoj kev sealing:Cov no yog "dry seal" threads. Lub foob yog tsim los ntawm cov neeg kho tshuab cuam tshuam (squeezing) ntawm cov txiv neej thiab poj niam tapers. Lawv feem ntau xav tau PTFE daim kab xev los yog xov sealant los tiv thaiv kom tsis txhob xau.
Daim ntawv thov:Siv dav hauv cov kav dej, cov kav dej, cov khoom siv hluav taws xob tsawg, -siab hydraulic systems, thiab cov khoom siv dav dav.
Yam ntxwv:Tus nqi qis thiab yooj yim rau nruab, tab sis tsis tsim los tswj cov khoom hnyav hnyav (rub) lossis cov kev kub ntxhov uas muaj nyob rau hauv cov dej tob tob.
NPT Threads specification
| Parameter | Specification / Tus nqi | Lus hais |
| Xov Form | Sharp V- Xov | Crests thiab cov hauv paus hniav yog truncated (pav) |
| suav nrog lub kaum sab xis | 60 degree | Lub kaum sab xis ntawm cov xov flanks |
| Taper | 1:16 (3/4 "rau ko taw) | Txoj kab uas hla hloov los ntawm 0.0625 "ib nti ntawm axis |
| Threads per Inch (TPI) | 8, 11.5, 14, 18, 27 | Nws txawv nyob ntawm seb cov yeeb nkab loj |
| Txoj Kev Sealing | Interference Fit + Sealant | Yuav tsum tau PTFE daim kab xev los yog xov sealant |
| Txuj | ANSI/ASME B1.20.1 | American National Standard |
API Threads yog dab tsi?
APIthreads yog tswj los ntawm covLub koom haum American Petroleumthiab tau tsim tshwj xeeb rau cov kev xav tau ntawm kev lag luam roj thiab roj.
API threads tau muab faib ua ntau hom tseem ceeb raws li lawv siv:
A. API Round Threads (STC/LTC)
Xov Form:60℃kaum sab xis, tab sis lubcrests thiab keeb kwm yog sib npaug.
Yam ntxwv:Lub voj voog tsim txo qis kev ntxhov siab, tso cai rau kev sib txuas kom tiv taus lub zog rub loj (nruj) thiab siab sab hauv.
Hom:Cov no suav nrogSTC (Cov xov luv luv)thiabLTC (Long Threaded)hais ua ntej.
B. API Buttress Xov (BTC)
Xov Form:Trapezoidal (square-ish) duab.
Yam ntxwv:Cov xov no "hook" ua ke, muab qhov siab tshaj plaws tiv thaiv axial nro. Lawv siv nyob rau hauv ultra- qhov dej tob.
C. API Kab Yeeb Nkab Xov
Cov no yog cov feem ntau zoo ib yam li NPT tab sis yog tsim los nrog nruj dua tolerances thiab siab dua precision thauj cov roj thiab roj.
API Casing Threads specification
| Parameter | STC (Short Round Xov) | LTC (Long Round Xov) | BTC (Butter Thread) |
| Xov Form | Round Xov | Round Xov | Trapezoidal Buttress |
| Threads per Inch (TPI) | 8 TSI | 8 TSI | 5 TSI |
| Xov Pitch | 3.175 hli (0.125 nti) | 3.175 hli (0.125 nti) | 5.080mm (0.200 nyob rau hauv) |
| Taper | 1:16 (6.25%) | 1:16 (6.25%) | 1:16 (6.25%) lossis 1:12 |
| Xov Angle | 60℃(Symmetrical) | 60℃(Symmetrical) | 10℃Stabbing / 3℃Load Flank |
| Xov Height (hn) | 1.810 hli (0.07125 nti) | 1.810 hli (0.07125 nti) | 1.575 hli (0.062 nti) |
| Siv Tau Ntev (L4 ) | Short (Lub hauv paus Length) | Ntev(Ntau tshaj STC) | Ntev |
| Txoj Kev Sealing | Interference + Compound | Interference + Compound | Interference + Compound |
| Tensile zog | Nruab nrab | Siab | Siab heev |
| Daim ntawv thov | Cov qhov dej ntiav, Tsawg kev nyuaj siab | Qhov dej tob, Siab nro | Ultra- txoj hlua sib sib zog nqus lossis hnyav |
Qhov txawv: NPT vs. API
| Feature | NPT Xov | API Xov (piv txwv li, STC/LTC) |
| Txuj | ANSI/ASME B1.20.1 | API Spec 5B |
| Xov Zoo | Sharp V-Suab(pas crests / cag) | Round Shape(rounded crests / hauv paus) |
| Kev sib khi | Relies ntawm crest/root cuam tshuam | Relies on thread compound & high precision |
| Lub zog | Standard siab kuj | Siab tensile & siab siab |
| Kev siv loj | Kev tsim kho, kav dej, Factory Lines | Casing, Tubing, thiab Drill Pipes |
API Xov Hoobkas
API Threads test equipments
API Daim Ntawv Pov Thawj
FAQ
API xov sawv rau dab tsi?
API xov yog hais txog cov qauv xov tshwj xeeb tsim los ntawm American Petroleum Institute (API) rau kev sib txuas tubing, casing, thiab laum yeeb nkab hauv kev lag luam roj thiab roj.
Dab tsi yog hom API Threads sib txawv?
API threads feem ntau categorized rau Short Round Thread (STC), Long Round Thread (LTC), thiab Buttress Thread (BTC) rau casing, nrog rau kev xyaum cov yeeb nkab xov hom xws li Regular (REG), Full Hole (FH), thiab Internal Flush (IF).
STC (Short Round Xov): Nta luv xov ntev, qis kev sib txuas lub zog, haum rau cov qhov dej ntiav lossis qis - kev ntxhov siab ib puag ncig, nrog 8 threads ib nti.
LTC (Long Round Xov): Muaj cov xov ntev dua, thaj chaw sib koom ua ke loj dua, muab lub zog tensile ntau dua thiab zoo dua sealing, zoo tagnrho rau cov qhov dej sib sib zog nqus lossis hnyav- daim ntawv thov, kuj nrog 8 threads ib nti.
BTC (Butter Thread): Muab cov compressive thiab tensile kev ua tau zoo, feem ntau siv nyob rau hauv siab - siab, siab - load zoo tej yam kev mob, nrog zoo sealing thiab qaug zog kuj piv rau round threads.
