Lus hauv no teb E qhia wondered dab tsi hu ib ntu cylindrical? Lub yeeb nkab lossis nws yog ib lub raj?
Kev tsis txaus siab, puas yog?
Ob qho tag nrho cov cuab yeej zoo li yuav tsum ua haujlwm rau tib lub tswvyim cylindrical. Txawm tsis zoo li cas los xij, tube thiab cov yeeb nkab muaj kev txawv txav txawv.
Dab tsi yog qhov txawv ntawm cov yeeb nkab thiab lub raj?
Peb mus tua cov yeeb nkab vs raj cia!
Qhov txawv yog nyob rau hauv cov ntsiab lus!
1. POB ZEB
Thaum txiav txim siab txog qhov loj me, cov kav dej thiab cov kav dej ntsuas sib txawv.
Lub raj yog ntsuas nrog qhov kev pabcuam ntawm cov npoo sab nraud (OD) nrog rau ntau yam ntawm cov phab ntsa. Phab ntsa thickness yog tseem ceeb heev raws li lub raj lub zog yog nyob ntawm nws.
Ntawm qhov tod tes, peb ntsuas cov yeeb nkab los ntawm kev siv lub nominal sab nraud. Qhov tseem ceeb tshaj plaws yog lub peev xwm los yog hauv sab hauv (ID). [1]
Cov kav tau txais cov ntawv sau loj uas muaj qhov ntau thiab tsawg li ntawm ib nrab-nti mus rau ntau qhov taw. Cov hlab pas feem ntau yog siv rau hauv cov ntawv thov uas yuav tsum muaj cov kab me me. Txawm tias cov kav dej sib tshuam 10-inch feem ntau, nws yog qhov tsawg kawg uas koj yuav nrhiav tau 10-inch tube.
2. NTSE THICKNESS
Phab ntsa thickness yog ib qho tseem ceeb uas yuav tsum tau sib txawv ntawm cov kav dej thiab raj. [2]
Lub thickness ntawm ib tug tubing yog feem ntau teev los ntawm ib lub koob tsho rau thinner thickness thiab rau txoj raj plawg nws yog qhia los ntawm cov zauv ntawm ib nti los yog millimeter . Qhov ntau ntawm tubing yog 20 gauge, uas yog 0.035 inch txog li ib lub thickness ntawm 2 nti.
Lub phab ntsa ntawm cov yeeb nkab yuav raug xa mus raws li cov yeeb nkab sijhawm . Cov yeeb nkab feem ntau yog:
• SCH20,
• SCH40,
• thiab SCH80.
SCH40 yog cov tshaj thiab SCH80 hnyav heev.
3. QAUV
Lub raj tus qauv tsis tas yuav tsum nyob ib puag ncig. Nws tuaj yeem ua xwm yeem los yog qiv ib yam nkaus. Lawv feem ntau yog cov nqaj hlau welded. [3] Kev Hlub
Yeeb nkab, ntawm qhov tod tes, yog ib txwm puag ncig thiab tsis yeem. Nws tsis tuaj yeem ua tau yooj yim dua yam tsis siv cov cuab yeej tshwj xeeb. Cov kav dej feem ntau yog tsis ntswj thiab siab tau siv kom tsis txhob muaj cov leakages vim lawv feem ntau nqa dej lossis roj.
4. TOLERANCE
Sib piv kev ua siab ntev ntawm ob leeg thiab kav dej, qhov ua siab ntev rau cov kav dej yog cov xoob dua li cov leeg . Cov kav dej feem ntau yog siv los thauj los yog faib, yog li cov khoom ntawm siab, ncaj nraim, lossis puag ncig yog teev meej. [4]
5. RAUG TXOJ KEV SIV
Cov ntaub ntawv thiab cov hom kev lag luam ntawm cov kav dej thiab lub raj nyias txawv nyias.
Cov hlab ntsha yuav tsum muaj ntau theem ntawm cov txheej txheem, cov ntawv xeem, kev tshuaj xyuas. Yog li ntawd, lub sij hawm tus me nyuam ntev dhau lawm. Cov paib ntawm cov hlab yog piv tau ntau dua cov kav dej.
Xwb, kev tsim cov txheej txheem ntawm cov yeeb nkab yog yooj yim dua rau cov leeg thiab ntau zaus ntau hauv cov khoom loj. [4]
6. TSHAJ
Kev tsim los ntawm cov hlab siv siv ntau zog, lub zog, thiab khoom siv. Yog li ntawd, thaum muaj tib yam khoom, qhov tsim nqi ntawm cov hlab yog feem ntau dua cov kav dej.
Cov txheej txheem tsim cov kav dej yog qhov yooj yim dua thiab lawv yeej ib txwm tsim nyob rau hauv ntau ntau. Qhov no ua rau kev txiav nyiaj hauv cov kav dej. [3] Kev Hlub
7. SIV
Cov kav dej yog siv rau kev thauj mus los ntawm cov dej thiab roj xws li dej, roj, roj, hluav taws xob thiab lwm yam. Yog li, sab nraud thiab sab hauv kab yog qhov ntsuas thiab kev ntsuas siab tseem ceeb.
Ntawm qhov yeeb yaj kiab, qhov loj siv rau plab yog rau cov hom phiaj xws li txua txheem. Lawv feem ntau muab siv rau hauv cov ntawv uas hu rau kev tawm sab nraud. Yog li no, sab nraum lub ntsiab yog qhov tseem ceeb heev raws li nws qhia ntau npaum li cas lub raj tau tuav.
8. MATERIAL
Cov kav dej feem ntau yog ua los ntawm carbon steel los yog hlau tsis tshua muaj hlau.
Cov hlab ntsha yog ua los ntawm me ntsis hlau, txhuas, tooj dag, tooj liab, chrome, stainless hlau, lwm yam.
Qhov txawv ntawm cov ntaub ntawv kuj yog vim li cas rau qhov txawv ntawm cov nqi thiab daim ntawv sau npe. [4]
Qee cov kev siv cov yeeb nkab siv los yog cov kav dej piping yog:
• Qhov API muaj - tam sim no ISO 3183. Piv txwv li: API 5L Qib B - tam sim no ISO L245 qhov chaw tus zauv pom lub zog hauv MPa
• ASME SA106 Qib B (Seamless carbon yeeb nkab rau kev kub thiab txias)
• ASTM A312 (Seamless thiab welded austenitic stainless hlau yeeb nkab)
• ASTM A36 (Carbon steel yeeb nkab rau kev siv lossis tsis tshua muaj siab siv)
• ASTM A795 (Cov yeeb nkab nkaug rau cov hluav taws tua hluav taws tshuab)
9. COV KHOOM NOJ THIAB KEV KHOOM NOJ
Qhov kev ntsuam xyuas siab, kev tawm dag zog, kev txav mus los yog qhov tseem ceeb tshaj rau cov kav dej. Txawm li cas los xij, rau cov hlab, qhov nyuaj, lub zog tensile, thiab siab precision yog tus yuam sij rau kev ua tau zoo.
Carbon, Manganese, Sulfur, Phosphorus, thiab Silicon yog cov tshuaj tseem ceeb rau cov kav dej. Pliag rau txoj hlua, cov microelements tseem ceeb heev rau qhov zoo thiab txheej txheem.
10. QHOV TSEEB TXIAJ MUAS
Cov kav dej yuav tsum tau pleev xim los yog coated rau anti corrosion los yog oxidation rau sab nraum zoov kev thauj los yog underground thauj.
Cov hlab ntsha feem ntau mus los ntawm kev tu tsiaj los yog kev kho tshwj xeeb txhuam rau lawv qhov kev siv teb.
11. KEV TIV THAIV
Siv cov yeeb nkab mus txuas rau lwm tus ntau dua ntawm kev ua hauj lwm ntau zog raws li nws yuav tsum tau vuam, threading, los yog flanges nrog rau nws cov khoom siv.
Ntawm qhov tsis sib xws, leeg yuav tuaj yeem nrawm nrawm thiab effortlessly nrog flaring, brazing, los yog coupling. Lub rooj sibtham tuaj yeem tuaj yeem siv qhov chaw ntawm tube fittings qhov chaw uas yuav tsum tau siv high school cov qauv. [3] Kev Hlub
Yeeb nkab vuam txuag kom zoo dua qub tias tube joining.
12. LUB ENDS
Cov yeeb nkab kawg yog feem ntau nyob rau hauv daim ntawv dawb los yog daim ntawv sib tw . Whereas, tubes feem ntau tuaj nrog qhov sib txuas xaus los yog tshwj xeeb kawg ua tiav xws li cov hnub tsis tau xaus, kev sib tw tshwj xeeb ntsia hlau thiab lwm yam.
