Dab tsi yog Threading Processing Technique for Steel Pipes?

Kev siv thev naus laus zis ntawm cov yeeb nkab steel yog hais txog cov txheej txheem ntawm kev ua cov hniav ib yam, suab thiab taper mus rau qhov kawg ntawm cov yeeb nkab steel los ntawm kev txiav lossis yas deformation (los tsim cov xov). Qhov no ua rau kev sib txuas ntawm cov yeeb nkab steel nrog rau lwm cov kav dej (xws li li qub, cov yeeb nkab fittings, thiab cov khoom siv sib txuas). Lub hauv paus ntawm cov thev naus laus zis no yog nyob rau hauv kev tswj cov geometric tsis sib xws ntawm cov xov (xws li lub kaum sab xis ntawm cov hniav, lub suab, qhov nruab nrab txoj kab uas hla, thiab taper), kom ntseeg tau tias kev sib khi, lub zog thiab kev ntseeg siab ntawm kev sib txuas.

1. Txoj kev ua haujlwm tseem ceeb

• Txiav kev ua: Txoj kev siv feem ntau yog siv lub tshuab xa xov (hluav taws xob lossis phau ntawv) los tsav cov tuag tig, uas tom qab ntawd txiav qhov kawg ntawm cov yeeb nkab steel los ua cov xov. Txoj kev no yog tsim rau feem ntau hom steel yeeb nkab cov ntaub ntawv (xws li carbon steel, stainless hlau, galvanized yeeb nkab).
• Yas deformation:Qhov kawg ntawm cov yeeb nkab steel yog extruded siv lub tshuab threading lossis lub tshuab dov ua rau cov hlau ntws los ntawm plastically thiab tsim cov xov. Txoj kev no tsim nyog rau cov ntaub ntawv uas muaj cov yas zoo (xws li qis- cov pa roj carbon steel), uas muaj kev ua haujlwm siab thiab cov xov muaj zog. Txawm li cas los xij, nws yuav tsum muaj cov qauv khoom siv siab.

2. Cov txheej txheem tseem ceeb

• Xov profile:Nws muab faib ua 55℃(British Whitworth xov, xws li G thiab R series), 60℃(American Unified xov, xws li NPT series), thiab metric 60℃(xws li M series). Ntawm lawv, cov yeeb nkab xov feem ntau siv 55℃lossis 60℃profiles.
• Pitch thiab naj npawb ntawm cov hniav:Lub suab yog qhov kev ncua deb ntawm cov ntsiab lus sib thooj ntawm lub suab kab ntawm ob cov hniav uas nyob ib sab. Nws feem ntau yog qhia raws li tus naj npawb ntawm cov hniav ib nti (TPI) (piv txwv li, 1/2 "NPT xov muaj 11 cov hniav ib nti, thiab lub suab yog kwv yees li 2.309mm). 
• Cone ratio: Sealing yeeb nkab threads (xws li NPT, R series) feem ntau muaj lub khob hliav qab ntawm 1:16 (uas yog, txoj kab uas hla hloov los ntawm 1 hli rau txhua 16 hli ntawm qhov ntev), thiab sealing yog tiav los ntawm lub khob hliav qab piv.
• Processing zaus:Nws yog txiav txim raws li cov yeeb nkab txoj kab uas hla. Rau cov kav me me - txoj kab uas hla (DN15-DN32), lawv tau ua tiav ob zaug; rau nruab nrab - cov kav dej (DN40-DN50), lawv tau ua tiav peb zaug; rau cov kav dej loj (DN70 thiab siab dua), lawv tau ua tiav peb mus rau plaub zaug kom paub meej cov xov tiav thiab cov npoo du.

3. Kev soj ntsuam zoo thiab kev tswj xyuas
Xov gauge tshuaj xyuas: Siv lub go gauge (GO) thiab tsis muaj -go gauge (NO GO) los ntsuas lub suab kab thiab suab ntawm cov xov. Lub go gauge yuav tsum tau muab tso rau tag nrho, thiab tsis muaj -go gauge yuav tsum tsis txhob muab tso rau ntau tshaj 2 lem.

• Nto zoo:Cov xov yuav tsum tsis muaj cov kab tawg, cov xov hlau tsis zoo, thiab cov burrs. Qhov saum npoo roughness yuav tsum ua tau raws li qhov yuav tsum tau ua (xws li Ra Tsawg dua lossis sib npaug li 3.2 μm).
• Cone angle thiab pitch diameter kam rau ua:Qhov sib txawv ntawm lub khob hliav qab ntawm lub sealing xov yuav tsum tsawg dua los yog sib npaug li 0.05mm / m, thiab lub suab txoj kab uas hla yuav tsum tau tswj nyob rau hauv ib tug heev nqaim ntau yam (piv txwv li, pitch inch kam rau ua ntawm qib 1 raug yog 0.01mm).

Cov threaded kev twb kev txuas ntawm steel kav yog feem ntau siv detachable kev twb kev txuas txoj kev nyob rau hauv lub piping system. Nws qhov tseem ceeb feem ntau yog nyob rau hauv cov hauv qab no:

1. sealing kev ntseeg tau
Los ntawm kev siv lub taper ntawm cov xov (xws li 1: 16 taper ntawm NPT) los yog cov ntaub ntawv sib khi (xws li sealing daim kab xev, hemp xov), nws tuaj yeem tiv thaiv qhov nruab nrab to. Nws yog qhov tsim nyog rau kev thauj mus los ntawm siab - siab, siab - kub thiab corrosive media (xws li roj av, roj av, cov khoom siv tshuaj lom neeg).

2. Kev sib txuas lub zog
Cov threaded kev twb kev txuas kis loads los ntawm cov hniav kev koom tes, featuring siab tensile thiab torsional zog, thiab muaj peev xwm ua tau raws li kev ua hauj lwm siab ntawm lub raj xa dej system (piv txwv li, roj casing tuaj yeem tiv taus ntau txhiab tons ntawm tensile load).

3. Yooj yim ntawm kev txhim kho thiab tu
Cov xov txuas tsis tas yuav tsum tau vuam, thiab cov txheej txheem kev teeb tsa tau nrawm, ua kom yooj yim rau ntawm - qhov chaw tsim kho. Nyob rau tib lub sijhawm, lub detachable feature pab txhawb kev tu, hloov thiab kho dua tshiab ntawm cov kav dej, yog li txo cov nqi tu.

4. Kev siv dav dav
Haum rau ntau yam steel yeeb nkab cov ntaub ntawv (carbon steel, stainless hlau, galvanized yeeb nkab), yeeb nkab diameters (DN15-DN100 thiab saum toj no), thiab ua hauj lwm tej yam kev mob (dej, roj, roj, chemical media), nws yog ib tug txheej txheem kev twb kev txuas txoj kev nyob rau hauv lub teb ntawm kev tsim kho, machinery, roj av, thiab tshuaj lom neeg kev lag luam.

Cov txheej txheem thoob ntiaj teb rau kev ua cov yeeb nkab steel yog tsim los ntawm cov koom haum xws li International Organization for Standardization (ISO), American Petroleum Institute (API), thiab National Standardization Administration Committee of China (GB). Cov hauv qab no yog cov qauv tseem ceeb:

1. ISO cov qauv (tseem lees paub thoob ntiaj teb)

• TS EN ISO 7-1:1994 "Pipe Thread Sealing - Part 1: Dimensions, Tolerances and Markings": Qhia qhov ntev, kam rau ua thiab cov cim rau 55℃sealing yeeb nkab threads, suav nrog "kem / cone haum" rau cylindrical threads sab hauv (Rp) thiab conical sab nraud threads (R1/R), thiab cov xov sab hauv (R1/R) conical sab nraud threads (R2).
• TS EN ISO 228-21:2000 "Tsis yog-Threaded Sealing Pipe Threads - Part 1: Dimensions, Tolerances and Markings": Cov qauv no qhia txog qhov ntev, kam rau ua, thiab cov cim rau 55℃tsis yog- sealing yeeb nkab threads (G series), uas muaj feem xyuam rau qis dua -} cov kav dej thiab cov kav dej tsis zoo (tseem hu ua cov kav dej tsis zoo) thiab cov dej tsis zoo (tseem hu ua cov kav dej tsis zoo) .

2. API Standards (Tshwj xeeb rau kev lag luam roj)

• API Spec 5B"Kev Ua Haujlwm, Kev Ntsuas thiab Kev Tshuaj Xyuas Cov Xov Tooj rau Tubing, Yeeb Nkab thiab Yeeb Nkab Hlau": Ib qho qauv tso cai hauv kev lag luam roj av, nws teev cov txheej txheem ua, ntsuas thiab tshuaj xyuas cov xov ntawm cov khoom siv roj av yeeb nkab (tubing, yeeb nkab, yeeb nkab steel), suav nrog geometric parameters thiab tolerances rau cov xov xov tshwj xeeb (xws li BTC) threads.
• API RP 5A5/ISO 15463: 2003"Nyob rau-Kev Tshawb Fawb Lub Tsev Tshiab Tubing Housings, Roj Lub tog raj kheej thiab kawg-Cov kav dej txuas txuas": Nws ntxiv rau ntawm - qhov chaw soj ntsuam qhov yuav tsum tau ua ntawm API 5B, kom ntseeg tau qhov zoo ntawm cov xov ua ntej lawv nruab rau ntawm -site.

3. GB txheem (sib npaug tau txais hauv Suav teb)

• GB/T 7306.1-2000"55℃Sealing Pipe Threads - Part 1: Cylindrical Inner Threads and Conical Outer Threads": Tus qauv no tau txais ISO 7-1: 1994 sib npaug, thiab qhia qhov ntev, qhov siab ntev thiab cov cim ntawm "cylindrical / conical haum" 55℃sealing yeeb nkab.
• GB/T 7306.2-2000"55℃Sealing Pipe Threads - Part 2: Conical Inner Threads and Conical Outer Threads": Cov qauv no tau txais ISO 7-1: 1999 sib npaug, thiab qhia txog 55℃sealing yeeb nkab threads nrog "cone / cone haum".
• GB/T 12716-2011"60℃Conical Pipe Thread": Txais ASME B1.20.2M: 2006 ua lub hauv paus rau kev kho dua tshiab. Nws qhia qhov ntev, kam rau ua thiab cov cim ntawm 60℃conical yeeb nkab threads (NPT series), thiab muaj feem xyuam rau American standard sealing yeeb nkab threads.

Qhov sib txawv ntawm cov txheej txheem txheej txheem ntawm cov txheej txheem txheej txheem feem ntau yog nyob rau hauv ntau yam xws li cov hniav profile, taper, mating method, thiab cov xwm txheej siv tau. Nov yog qhov sib txawv tseem ceeb:

1. Qhov sib txawv ntawm cov hniav profile kaum

• Imperial (ISO 7-1, GB / T 7306):Nta 55℃xov lub kaum sab xis, muab los ntawm imperial Whitworth xov, haum rau thaj tsam xws li Europe thiab Asia.
• Metric (API 5B, GB / T 12716):Nta lub kaum sab xis ntawm 60 degree, muab los ntawm cov qauv metric xov, haum rau cov roj- tsim cov cheeb tsam xws li North America thiab Middle East.

2. Lub kaum sab xis sib txawv

• Imperial kaw yeeb nkab xov (ISO 7-1, GB / T 7306): Lub taper ntawm conical sab nraud xov (R1, R2) yog 1:16 (txoj kab uas hla hloov los ntawm 1mm rau txhua txhua 16 hli ntev), ua tiav sealing los ntawm taper.
• Metric kaw cov yeeb nkab threads (API 5B, GB / T 12716): Lub taper ntawm lub conical yeeb nkab threads (NPT) kuj yog 1:16, tab sis cov xov profile yog steeper (60℃vs 55 degree), thiab yog haum rau siab dua kev ntsuam xyuas (piv txwv li, kev ua hauj lwm siab ntawm cov roj casing yuav ncav cuag ob peb txhiab phaus ib square inch).

3. Qhov sib txawv ntawm txoj kev koom tes

• Imperial sealing yeeb nkab threads:Lawv muab faib ua "kem / cone haum" (cylindrical internal thread Rp thiab conical sab nraud xov R1) thiab "conical / cone haum" (conical internal thread Rc thiab conical sab nraud xov R2). Ntawm lawv, "kem / cone haum" yog feem ntau siv txoj kev sib khi.
• Metric sealed yeeb nkab xov:Tsuas yog siv "cone / cone haum" (conical internal thread thiab conical sab nraud xov), ua tiav sealing los ntawm cov xov tus kheej taper, tsis tas yuav tsum tau ntxiv cov ntaub ntawv sealing (xws li daim kab xev).

4. Qhov sib txawv ntawm cov xwm txheej siv tau

• ISO 7-1, GB / T 7306:Muaj feem xyuam rau qis- siab, ib txwm- qhov kub thiab txias hauv cov kav dej (xws li dej, roj, cov kav dej cua txias), nrog rau qee cov kav dej tshuaj. 
• API 5B:Tshwj xeeb tsim los rau cov kav dej hauv av hauv kev lag luam roj thiab roj (xws li casings thiab tubing), cov kav dej no raug kev kub ntxhov siab heev (txog li 1000 bar), qhov kub thiab txias (xws li hydrogen sulfide thiab carbon dioxide). Lub zog thiab sealing kev ua tau zoo ntawm cov xov hauv cov kav dej no ntau dua li cov kav dej zoo tib yam.

5. Qhov sib txawv ntawm Standard Equivalence

• GB/T 7306.1-2000yog ib qho kev sib npaug ntawm ISO 7-1: 1994 (cov ntsiab lus technical yog tib yam nkaus, nrog rau kev hloov kho xwb), yooj yim rau kev nkag ntawm Suav cov khoom lag luam rau hauv kev lag luam thoob ntiaj teb. 
• GB/T 12716-2011 thiab ASME B1.20.2M: 2006: Txais nrog kev hloov kho (tseem khaws cov txuj ci hauv Suav teb, xws li cov qauv kev sim yooj yim rau cov khoom me me -} nplai hauv tsev), hloov tau zoo dua rau cov khoom siv ntawm Tuam Tshoj (xws li cov yas ntawm qis- carbon steel).

Kev siv thev naus laus zis ntawm cov yeeb nkab steel yog cov thev naus laus zis tseem ceeb rau kev sib txuas cov kav dej. Nws qhov zoo ncaj qha cuam tshuam rau kev ua haujlwm sealing, lub zog thiab kev ntseeg siab ntawm lub kaw lus. Cov qauv thoob ntiaj teb (xws li ISO 7-1, API 5B, GB / T 7306) muab cov kev qhia tshwj xeeb rau kev ua xov. Qhov sib txawv ntawm ntau yam qauv feem ntau yog nyob rau hauv cov xov profile kaum sab xis, taper, sib piv txoj kev thiab siv cov xwm txheej. Hauv kev siv tswv yim, cov xov zoo thiab cov qauv tsim nyog yuav tsum raug xaiv raws li kev ua haujlwm ntawm kev ua haujlwm (siab, kub, nruab nrab) kom muaj kev nyab xeeb thiab kev lag luam ntawm kev sib txuas.