API 5L PSL2 Longitudinal Submerged Arc Welded (LSAW) Yeeb Nkab
API 5L PSL2 LSAWcov yeeb nkab sawv cev rau qhov siab dua - cov lus qhia tshwj xeeb ntawm kab yeeb nkab tsim los rau kev thov cov ntawv thov uas txhim kho kev nyab xeeb, kev ntseeg tau, thiab kev ua haujlwm tseem ceeb. Nws yog tsim los ntawm kev tsim cov hlau phaj thiab vuam ib leeg ntev seam siv cov txheej txheem Submerged Arc Welding (SAW), tab sis kom nruj dua Cov Khoom Qhia Qib 2.
1. Cov Ntsiab Lus Txhais & Cov Ntsiab Lus Hloov Kho los ntawm PSL1
| Yam | API 5L PSL2 LSAW Pipe | Qhov tseem ceeb |
|---|---|---|
| Specification | API 5L (Line Pipe Specification),Khoom Specification Qib 2 | PSL2 ua kom nruj dua cov tshuaj lom neeg, khoom siv, thiab kev sim ntau dua li PSL1, ua kom muaj kev ua tau zoo dua thiab kev ntseeg siab. |
| Primary Application Driver | Txhim khu kev ruaj ntseg & kev ncaj ncees nyob rau hauv ib puag ncig nyuaj | Kev tso cai rau cov chaw uas qhov kev ua tsis tiav yog qhov hnyav, xws li sab ntug dej hiav txwv, thaj chaw Arctic, siab - thaj chaw muaj neeg nyob (Class 3/4), lossis siab - kev pabcuam qaug zog. |
2. Cov Lus Qhia Tshwj Xeeb & Txhim Kho Cov Cai (PSL2)
Cov lus hauv qab no qhia txog qhov tseem ceebqhov sib txawv thiab kev txhim khonruab nrab ntawm PSL2 thiab tus qauv PSL1 rau LSAW yeeb nkab.
| Requirement / Khoom | PSL1 (Piv txwv) | PSL2 (Txhim kho) | Qhov laj thawj rau PSL2 Txhim Kho |
|---|---|---|---|
| Tshuaj muaj pes tsawg leeg | Txhim kho Weldability & Fracture Toughness | ||
| • Carbon sib npaug (CE / CEpcm) | Txwv rau qib. | nruj dua, qis tshaj qhov txwv. | Txo txoj kev pheej hmoo ntawm qhov nyuaj, tawg - thaj chaw muaj kev cuam tshuam nyob rau hauv qhov vuam kub-Tebchaws cuam tshuam (HAZ). |
| • Phosphorus thiab Sulfur (P, S) | Max: 0.025% txhua. | Max: 0.020% txhua. | Txo cov ntsiab lus impurity, txhim kho ductility thiab toughness. |
| Mechanical Properties | Guaranteed Toughness & Uniform Strength | ||
| • Yield Strength Range | Tsis tau teev tseg. | Qhov siab tshaj tawm lub zog tau teev tseg(xws li, rau X65, max YS feem ntau Tsawg dua lossis sib npaug li 600 MPa). | Tiv thaiv kom dhau lub zog siab / tsis sib xws, txhim kho deformation tswj. |
| • Yield-rau-Tensile Ratio | Tsis tau teev tseg. | Qhov siab tshaj plaws tau teev tseg(piv txwv li, Tsawg dua lossis sib npaug rau 0.93 rau X65 thiab siab dua). | Ua kom muaj zog txaus- muaj peev xwm hardening thiab tiv thaiv kev tawg tawg tawg. |
| • Fracture Toughness | Tsis xav tau. | Yuav tsum tau Charpy V-Ntch Impact Testing: 1. Tag nrho -Size Specimensxav tau. 2. Kev ntsuas kubteev rau ib qhov project. 3. Siv zog tsawg kawg nkaus Absorbed zogtus nqi. |
Xyuas kom cov yeeb nkab tuaj yeem ntes tau khiav khiav, tshwj xeeb tshaj yog nyob rau hauv qhov chaw txias. |
| Kev Ntsuas & Kev Tshuaj Xyuas | Qib Siab Kev Ua Haujlwm Zoo | ||
| • Tsis yog -Kev kuaj kev puas tsuaj | 100% weld seam radiography lossis ultrasonics. | 100% weld seam ultrasonics (Automated UT)yog tus qauv thiab feem ntau xav tau rau lub cev tag nrho. | Ntau rhiab heev rau cov teeb meem tsis xws luag (xws li cov kab nrib pleb) dua li cov duab hluav taws xob. |
| • Hydrostatic Test Stress | Ntau dua lossis sib npaug li 95% ntawm SMYS rau 5+ sec. | Ntau dua lossis sib npaug95% ntawm SMYS rau 10+ vib nas this. | Lub sijhawm ntsuas ntev dua muab qhov kev nyab xeeb ntau dua. |
| • Transverse Tensile Test | Yuav tsum tau. | Yuav tsum tau,thiab yuav tsum suav nrog cov vuam. | Guarantees lub weld seam lub zog tsawg kawg yog sib npaug ntawm cov yeeb nkab lub cev. |
3. Cov ntawv thov ib txwm
PSL2 LSAW yeeb nkab yog siv nyob rau hauv ib puag ncig uas tus nqi ntawm qhov tsis ua hauj lwm yog siab heev:
Offshore Pipelines:Subsea flowlines, trunklines, thiab risers.
Arctic & Cold -Kev nyab xeeb kav dej:Qhov twg tsawg -kub toughness yog qhov tseem ceeb.
Siab -Cov Kab Ntsig Gas Kis:Tshwj xeeb tshaj yog nyob rau thaj chaw muaj neeg nyob (Chav Kawm 3 & 4).
Seismic los yog Geohazard- Cov cheeb tsam uas nyob ib puag ncig:Qhov twg cov kav dej yuav ntsib kev nyuaj siab.
Sour Service (H₂S{0}}muaj) Daim Ntawv Thov:Feem ntau teev nrog cov kev xav tau ntxiv.
4. Sib piv nrog lwm yam yeeb nkab hom & qib
| Tube Hom / Spec | Key Differentiator los ntawm API 5L PSL2 LSAW |
|---|---|
| API 5L PSL1 LSAW | Muaj cov kev cai txheem. Siv rau tus qauv onshore kis tau tus mob qhov twg PSL2 cov khoom txhim khu kev qha tsis raug cai los yog technically justified. |
| API 5L ERW (PSL2) | Ua los ntawm coil los ntawm hluav taws xob kuj welding. Siv rau cov kab me me. PSL2 xyuas kom zoo weld zoo, tab sis ERW tsis yog rau cov kab loj tshaj plaws xws li LSAW. |
| API 5CT L80/T95 Casing | Lub hom phiaj sib txawv:Rau kev tsim kho qhov dej hauv qhov dej, tsis ntev - thauj mus los. Sib txawv chemistry, kuaj (xws li, hardness), thiab qhov ntev. |
| Siab -Zoo sib txawv (piv txwv li, X80 PSL2) | Tib yam PSL2 cov qauv siv tab sis rau cov qib siab zog, yuav tsum tau nruj dua chemistry thiab kev ua tiav qib siab (xws li, Thermomechanical Controlled Processing - TMCP). |
5. Kev txiav txim siab txog kev yuav khoom & kev pov hwm zoo
Thaum xaj API 5L PSL2 LSAW yeeb nkab, cov hauv qab no yog qhov tseem ceeb:
Cov Lus Qhia Ntxiv:API 5LAnnex Hteev cov kev cai xaiv tau (piv txwv li, H.1 rau offshore, H.4 rau kev kuaj CTOD). Cov no feem ntau hu ua hauv kev txiav txim yuav khoom.
Thib peb-Kev soj ntsuam tog:Tej yaam num yuav luag ib txwm xav tau kev pov thawj ywj pheej (piv txwv li, los ntawm DNV, Lloyd's, BV) ntawm kev kuaj zeb thiab cov txheej txheem.
Traceability:Tag nrho traceability ntawm txhua cov yeeb nkab (suab tooj cua sov, phaj tooj) rov qab mus rau nws cov qub hlau yaj yog tus qauv.
Txheej:Sab nrauv los tiv thaiv- txheej txheej corrosion (piv txwv li, 3LPE, FBE) thiab sab hauv hauv ob sab phlu (piv txwv li, epoxy) feem ntau tau teev tseg nyias tab sis yog ib qho tseem ceeb rau cov khoom kawg.
Cov ntsiab lus
API 5L PSL2 LSAW yeeb nkab yog qhov kev xaiv zoo tshaj plaws rau qhov tseem ceeb, siab - qhov tshwm sim ntawm cov kav dej txuas.Nws txhim kho kev tswj hwm tshuaj, lav qhov hnyav, kev txwv cov cuab yeej cuab tam nruj dua, thiab kev sim nruj dua muab qhov kev nyab xeeb ntxiv uas yuav tsum tau muaj rau cov cheeb tsam nyuaj xws li thaj chaw sab nrauv thiab Arctic. Qhov kev xaiv ntawmPSL1 thiab PSL2 yog qhov tseem ceeb ntawm kev pheej hmoo -raws li kev txiav txim siab los ntawm kev tswj hwm kev nyab xeeb, ib puag ncig, thiab kev lag luam ntawm qhov project.
