Txheej txheem cej luam
API 5L X46 yog ib qho kev qhia tshwj xeeb rau carbon steel kab yeeb nkab siv feem ntau hauv kev thauj mus los ntawm cov roj, roj, thiab lwm yam kua hauv kev lag luam pipeline. "API 5L" qhia txog tus qauv tsim los ntawm American Petroleum Institute (API), thiab "X46" qhia tiasYam tsawg kawg nkaus Yield Strengthntawm cov yeeb nkab, uas yog 46,000 psi (los yog kwv yees li 317 MPa).
Qib no yog tsim los kom muaj qhov sib npaug zoo ntawm lub zog thiab weldability rau qhov tshwj xeeb siab thiab ib puag ncig.
Cov yam ntxwv tseem ceeb
| Khoom | Specification |
|---|---|
| Txuj | API Specification 5L (Ltest Edition: API 5L Ed. 46) |
| Qib | X46 (tseem sau li L360 hauv ISO 3183 sib npaug) |
| Yam tsawg kawg nkaus Yield Strength | 46,000 psi(317 MPa) |
| Yam tsawg kawg Tensile Strength | 60,000 psi (414 MPa) |
| Tshuaj muaj pes tsawg leeg | Feem ntau cov hlau (Fe) nrog tswj cov pa roj carbon (C), Manganese (Mn), Silicon (Si), thiab txwv sulfur (S) thiab Phosphorus (P). |
1. Cov txheej txheem tsim khoom (Cov Khoom Qhia Tshwj Xeeb Qib - PSL)
API 5L kav dej yog tsim nyob rau hauv ob lub ntsiab khoom Specification Levels, uas txhais tau hais tias yuav tsum tau sib txawv yuav tsum tau rau tshuaj muaj pes tsawg leeg, txhua yam khoom, thiab kev xeem.
PSL 1 (Standard Quality)
Tshuaj muaj pes tsawg leeg:Tswj tau, tab sis nrog kev txwv me ntsis dav dua li PSL 2.
Kev kuaj:Standard mechanical tests (tensile, hardness, flattening, thiab lwm yam).
Kev siv:Cov kev pabcuam dav dav dav dav uas qhov siab tawv tsis yog qhov yuav tsum tau ua.
PSL 2 (Qhov Zoo Tshaj Plaws)
Tshuaj muaj pes tsawg leeg:Tighter tswj, suav nrog siab tshaj Carbon Equivalent (CE) rau kev txhim kho weldability.
Txhim kho Mechanical Properties:Tshwj xeeb yam tsawg kawg nkaus Charpy V-Notch (CVN) cuam tshuam qhov tseem ceeb yuav tsum tau ua kom ntseeg tau tias cov yeeb nkab tuaj yeem tiv thaiv kev tawg tawg, tshwj xeeb tshaj yog nyob rau hauv qhov chaw txias dua.
Kev kuaj nruj dua:suav nrog ntxiv tsis yog -kev kuaj kev puas tsuaj (NDT), zoo li kev kuaj ultrasonic, kom ntseeg tau tias seam ncaj ncees.
Kev siv:Cov kav dej hauv qhov chaw xav tau, xws li sab ntug dej hiav txwv, thaj chaw arctic, lossis siab - kev pabcuam siab.
2. Qhov ntau thiab tsawg
API 5L X46 kav dej muaj nyob rau hauv ntau qhov ntau thiab tsawg:
Sab nraud txoj kab uas hla (OD):Los ntawm me me -inch (piv txwv li, 2-3/8") mus rau loj-inch (piv txwv li, 42" thiab siab dua) kav.
Phab ntsa Thickness (WT):Txhais los ntawm lub sij hawm (piv txwv li, SCH 40, SCH 80) los yog ib tug zauv thickness. Feem ntau cov phab ntsa thicknesses ntawm qis dua 0.25 ntiv mus rau tshaj 1 nti.
Ntev:Feem ntau muab nyob rau hauv random ib leeg (R1), ob (R2), los yog triple (R3) random lengths, los yog mus rau ib tug txiav ntev ntev.
3. Mechanical Properties (Ntaus)
| Mechanical Property | PSL 1 Requirement | PSL 2 Yuav Tsum Tau |
|---|---|---|
| Yield zog (min.) | 46,000 psi (317 MPa) | 46,000 psi (317 MPa) |
| Tensile zog (min.) | 60,000 psi (414 MPa) | 60,000 psi (414 MPa) |
| Elongation | Raws li tus qauv qauv raws li tus qauv loj. | Raws li tus qauv qauv raws li tus qauv loj. |
| Charpy V-Ntch Impact Test | Tsis yuam | Yuav tsum tau.Yam tsawg kawg nkaus absorbed zog yog teev raws li qib thiab loj. |
| Hardness Test | Tsis yuam | Feem ntau xav tau, tshwj xeeb tshaj yog rau kev pabcuam qaub (H2S ib puag ncig). |
4. Chemical Composition (Hloov ntau yam, % los ntawm qhov hnyav)
Qhov muaj pes tsawg leeg sib txawv los ntawm cov chaw tsim khoom thiab cov txheej txheem, tab sis feem ntau nws poob rau hauv cov kev txwv no:
| Lub ntsiab | Yam PSL 1 Range | PSL 2 Kev txwv tseem ceeb |
|---|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.26% | Tighter tswj, qis max. |
| Manganese (Mn) | Tsawg dua lossis sib npaug li 1.20% | Kev tswj nruj dua |
| Silicon (Si) | - | - |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.030% | Tsawg dua lossis sib npaug li 0.030% |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.030% | Tsawg dua lossis sib npaug li 0.030% |
| Carbon sib npaug (CE) | Tsis tau teev tseg | Muaj kev txwv ntau tshaj(piv txwv li, CE IIW Tsawg dua lossis sib npaug ntawm 0.43 lossis CEPcm Tsawg dua lossis sib npaug rau 0.25) kom ntseeg tau tias muaj kev sib txuas. |
5. Kev siv ntau
API 5L X46 yeeb nkab yog siv rau hauv:
Sib sau kab:Kev thauj cov roj av lossis roj av los ntawm lub qhov dej mus rau cov chaw ua haujlwm.
Transmission Pipelines:Ntev -kev thauj mus los ntawm cov roj thiab cov nkev.
Cov kab sib faib:Cov tes hauj lwm hauv zos uas xa cov roj rau cov tsev thiab cov lag luam.
Industrial Piping:Rau cov txheej txheem nyob rau hauv refineries, petrochemical nroj tsuag, thiab cov chaw tsim hluav taws xob.
Kev siv tus qauv:Qee lub sij hawm siv rau cov kab ke los yog piling hauv marine ib puag ncig, tab sis qhov no tsis yog nws lub hom phiaj tseem ceeb.
6. Qhov zoo thiab qhov tsis zoo
Qhov zoo:
Proven Standard:API 5L yog tus qauv thoob ntiaj teb lees paub thiab ntseeg siab.
Lub zog zoo - rau - Tus nqi sib piv:X46 muaj qhov muaj zog loj dua cov qib qis (xws li B/X42) yam tsis muaj tus nqi dhia ntau.
Muaj:Dav tsim thiab muaj nyob rau hauv ntau qhov ntau thiab tsawg.
Weldability:Nrog rau kev tswj chemistry (tshwj xeeb tshaj yog nyob rau hauv PSL 2), nws yog feem ntau yooj yim rau weld siv cov txheej txheem ntau.
Qhov tsis zoo:
Lub zog qis dua cov qib niaj hnub:Piv rau cov qib siab dua xws li X65, X70, lossis X80, X46 tsis tshua haum rau siab - siab lossis tob - dej siv qhov hnyav thiab phab ntsa tuab yog qhov tseem ceeb.
Corrosion Susceptibility:Zoo li txhua cov pa roj carbon steel, nws muaj kev cuam tshuam rau corrosion thiab yuav tsum tau coatings (FBE, 3LPE) thiab cathodic tiv thaiv thaum faus los yog submerged.
Cov ntsiab lus
API 5L X46yog ib qho kev txhim khu kev qha, nruab nrab- qib qib ntawm carbon steel yeeb nkab uas tau ua haujlwm hauv kev lag luam hluav taws xob rau ntau xyoo lawm. Thaum cov tshiab, siab dua - qib zog muaj ntau dua rau cov phiaj xwm xa tawm tshiab loj, X46 tseem yog ib qho kev qhia zoo meej thiab tus nqi- siv tau zoo rau ntau qhov kev sib sau, kev faib tawm, thiab kev siv cov kav dej dav dav uas nws lub zog tshwj xeeb thiab cov yam ntxwv muaj zog yog zoo- haum. Thaum yuav khoom, nws yog ib qho tseem ceeb kom paub meej seb puas yogPSL 1 lossis PSL 2yuav tsum tau ua raws li cov kev pab cuam.
