Qib B Welded Yeeb Nkab thiab Submerged Arc Txheej Txheem
API 5L Qib B welded yeeb nkab yog hais txog L245 kab yeeb nkab uas cov seam yog tsim los ntawm submerged arc vuam, abbreviated SAW. Nyob rau hauv cov txheej txheem no, ib tug hluav taws xob arc raug ntaus nyob rau hauv ib daim pam ntawm granular flux, yog li lub arc thiab lub pas dej molten yog shielded los ntawm cov cua thiab cov hlau weld solidifies nrog ib tug tsawg oxygen thiab nitrogen cov ntsiab lus. Qhov tshwm sim yog ib qho tawv fusion welded seam uas tuaj yeem tsim tau ntawm cov nyiaj tso tawm siab ntawm cov phab ntsa tuab, uas yog vim li cas SAW tsev neeg dominates loj txoj kab uas hla. Qib B los yog L245, nrog rau qhov tsawg kawg nkaus yield zog ntawm 245 MPa thiab lub zog tensile tsawg kawg nkaus ntawm 415 MPa.
LSAW thiab SSAW piv
| Yam khoom | LSAW (Longitudinal SAW) | SSAW (helical lossis kauv SAW) |
|---|---|---|
| Cov khoom pib | Phaj, tsim los ntawm JCOE, UOE lossis yob dabtsi yog khoov | Coil, tsim ntawm lub kaum sab xis helix |
| Seam orientation | Ib tug longitudinal seam, welded sab hauv thiab sab nraud | Helical seam hla tag nrho ntev |
| Txoj kab uas hla yooj | Txhua txoj kab uas hla xav tau nws tus kheej cov cuab yeej | Ib txoj kab dav dav npog ntau qhov diameters |
| Hom lub zog ntawm seam | Weld lub zog thiab toughness phim cov yeeb nkab lub cev ze | Weld zoo nyob ze ntawm kev tsim thiab seam taug qab tswj |
| Kev siv | Hla lub teb chaws kis tau tus mob mains thiab high pressure kab | Kev xa dej, piling, kab tsis tshua muaj siab |
Mechanical thiab Chemical Requirements
Qib B yeeb nkab yog muab rau PSL1 lossis PSL2. Ob theem muaj qhov tsawg kawg nkaus tawm los thiab tensile zog ntawm 245 MPa thiab 415 MPa; Qhov sib txawv yog nyob rau hauv cov tshuaj txwv, qhov yuav tsum tau muaj kev cuam tshuam kev kuaj thiab cov pa roj carbon sib npaug tswj ntawm PSL2, ntxiv rau nruj tolerances thiab kev soj ntsuam ntxiv. Kev lees txais elongation yog muab los ntawm API 5L cov rooj, uas cuam tshuam txog tus nqi uas yuav tsum tau muaj rau qhov chaw kuaj thiab lub zog tensile ntau dua li siv ib daim duab ruaj khov. Weld tensile tests, transverse los yog longitudinal raws li siv tau, paub meej tias qhov vuam thiab kub cuam tshuam cheeb tsam ua haujlwm zoo ib yam nrog cov yeeb nkab lub cev.
Testing SAW Seam
Kev kuaj pom ntawm sab hauv thiab sab nraud weld hlaws rau profile, undercut thiab overlaps.
Ultrasonic soj ntsuam raws tag nrho seam ntev kom pom tsis muaj fusion, slag inclusions thiab porosity.
Kev ntsuam xyuas hluav taws xob ntawm qhov vuam xaus, qhov pib thiab nres ntawm qhov vuam yog qhov tseem ceeb tshaj plaws.
Kev ntsuam xyuas hydrostatic ntawm txhua qhov ntev uas tau teev tseg, ua raws li qhov ntsuas qhov ntev ntawm txoj kab uas hla, ovality, phab ntsa thickness thiab kawg squareness.
Flattening los yog khoov kev ntsuam xyuas ntawm lub vuam kom paub meej tias qhov ductility ntawm qhov sib koom ua ke.
Qhov twg Qib B SAW Pipe Fits
Vim tias qib muaj lub zog me me tab sis zoo heev weldability thiab toughness, SAW yeeb nkab nyob rau hauv L245 yog xaiv rau cov dej nyoos thiab cov dej haus mains, dej txias thiab cov dej tua hluav taws, slurry thiab tailings pipelines, tsis tshua muaj siab roj thiab cua kab, marine thiab piling daim ntaub ntawv, thiab raws li structural raj. Hauv refinery thiab cog piping nws yog siv rau kev siv hluav taws xob thiab cua txias circuits. Qhov twg cov khoom thauj nruab nrab yog qaub, cov khoom raug txiav txim rau PSL2 thiab tshuaj xyuas tiv thaiv ISO 15156 hardness thiab chemistry txwv ua ntej nws txais kev pabcuam hydrocarbon.
Vuam, Fabrication thiab tuav
Field girth welds nyob rau hauv Qib B yeeb nkab yog tsim los ntawm phau ntawv hlau arc, roj hlau arc lossis flux cored arc txheej txheem, thiab cov txheej txheem tsim nyog raws li API 1104 rau kev ua haujlwm hauv raj xa dej lossis hauv ASME Boiler thiab Pressure Vessel Code Tshooj IX rau cog piping. Preheat yog ib txwm txwv rau cov pa roj carbon tsawg no, tab sis nws tau nce rau cov phab ntsa tuab lossis qhov ntsuas kub qis los tswj hydrogen pab tawg. Txheej txheej feem ntau yog siv tom qab vuam thiab qhov ntsuas qhov ntev, thiab cov yeeb nkab kawg yuav tsum tau tiv thaiv nrog lub kaus mom thaum lub sij hawm cia kom lub bevel thiab cov weld xaus nyob rau hauv cov xwm txheej uas lawv tau sim.
FAQ
Q: SAW txhais li cas hauv API 5L welded yeeb nkab?
SAW stands rau submerged arc vuam, nyob rau hauv uas lub arc yog shielded los ntawm ib txheej ntawm granular flux. Nws yog siv rau longitudinal thiab helical seams ntawm txoj kab uas hla loj kab yeeb nkab.
Q: Puas yog Qib B welded yeeb nkab tib yam li Class B yeeb nkab?
Tsis yog. Qhov tseeb API 5L tsim yog Qib B, uas txhais tau hais tias qhov tsawg kawg nkaus tawm los thiab lub zog tensile; cov lus piav qhia ntawm cov yeeb nkab raws li Chav B yog kev txhais lus yuam kev rau tib qib.
Q: Qhov twg zoo dua, LSAW lossis SSAW yeeb nkab?
LSAW yeeb nkab feem ntau muaj cov seam uas phim cov yeeb nkab lub cev ntau dua thiab nyiam dua rau kev sib kis siab; SSAW yeeb nkab yog kev lag luam rau kev xa dej, kev sib txuas thiab kev pabcuam siab.
Q: Qhov kev ntsuam xyuas vuam siv li cas rau SAW yeeb nkab?
Kev kuaj pom pom, kev kuaj xyuas ultrasonic ntawm tag nrho cov seam, radiographic kuaj ntawm weld xaus, kuaj hydrostatic thiab weld mechanical tests, nrog rau qhov pom zoo hauv kev yuav khoom.
Q: Qib B SAW yeeb nkab puas tuaj yeem siv rau kev pabcuam qaub?
Yog lawm, thaum txiav txim rau PSL2 nrog hardness thiab chemistry tswj uas ua tau raws li ISO 15156, nrog rau NACE MR0175 siv khaws cia rau cov lus qhia qub.
Q: Cov yeeb nkab kawg tau npaj li cas?
Qhov xaus yog txiav square thiab bevelled rau thaj chaw vuam, nrog lub bevel lub kaum sab xis thiab lub ntsej muag qhov ntev tau pom zoo nyob rau hauv qhov kev txiav txim kom lawv phim cov kev tsim nyog teb vuam txheej txheem.
