Txheej Options thiab Surface Protection rau API 5L X52 Pipes
API 5L X52 (L360) kab yeeb nkab yog siab - lub zog carbon steel, thiab zoo li txhua cov pa roj carbon steel nws tso siab rau kev tiv thaiv saum npoo rau kev pabcuam ntev. Kev xaiv txheej txheej - sab nraud, sab hauv, lossis ob qho tib si - yog tsav los ntawm ib puag ncig: faus av, dej hiav txwv, huab cua, lossis qhov nruab nrab thauj. Phau ntawv qhia no piv cov txheej txheem txheej txheem tseem ceeb thiab kev tswj xyuas zoo tom qab lawv.
1. Los tiv thaiv-Txoj kev xaiv txheej txheej
3PE txheej (peb- txheej polyethylene):
a fusion-bonded epoxy puag rau adhesion, copolymer adhesive nruab nrab- txheej, thiab tawv polyethylene txheej txheej - kev lag luam tus qauv rau faus cov kav dej, sib txuas cov kev tiv thaiv corrosion nrog cov cuab yeej tiv thaiv av thiab tuav kev puas tsuaj
FBE (fusion bonded epoxy):
ib qho - txheej epoxy hmoov txheej nrog zoo adhesion thiab cathodic - tsis sib haum xeeb, siv ib leeg lossis ua txheej txheej ntawm 3PE, thiab zoo tagnrho rau kev ua haujlwm kub txog li 100 degree
Kub-dip galvanizing:
sacrificial anode tiv thaiv rau atmospheric thiab dej kev pab cuam - yig, tus kheej- kho, thiab zoo tagnrho rau saum toj no - hauv av structural thiab utility piping
Passivation:
rov qab kho cov yeeb yaj kiab tiv thaiv ntawm cov khoom siv hlau stainless; rau cov pa roj carbon steel, chemical conversion coatings los yog internal linings yog siv nyob rau hauv qhov chaw corrosion yog qhov txaus ntshai
2. Txheej Txheej Sib Piv
| Qhov system | Mechanism tiv thaiv | Hom Kev Pabcuam |
|---|---|---|
| 3 PEB | Epoxy adhesion + polyethylene barrier | faus ntev - cov kav dej nyob deb |
| FBE | Epoxy barrier, cathodic disbondment resistant | Cov kab faus, siab -kev pabcuam kub |
| Kub-dip galvanizing | Zinc (cathodic) | Saum - hauv av, dej thiab cov qauv |
| Sab hauv txheej | Epoxy, cement mortar lossis yas barrier | Dej, slurry thiab corrosive media |
3. Kev npaj thiab daim ntawv thov
Txhua txheej txheej txheej pib nrog kev npaj nto: moj tej tawg tu rau Sa2.5 tshem tawm zeb nplai, xeb thiab roj, thiab tsim cov thauj tog rau nkoj profile uas coatings xav tau adhesion. Rau 3PE thiab FBE cov yeeb nkab yog ces preheated thiab cov hmoov siv electrostatically; rau galvanizing cov yeeb nkab ntxuav yog fluxed thiab immersed nyob rau hauv molten zinc ntawm txog 450 degree. Txheej txheej hnub so raug kuaj pom nrog lub txim taws (hnub so) kev sim, thiab kev sib khi tau raug txheeb xyuas raws li tus qauv txheej txheem.
4. Kev Pov Hwm Zoo thiab Kev Xeem (NDT)
Kev nyab xeeb- cov ntawv thov tseem ceeb tswj hwm cov txheej txheem pov thawj zoo:
Tsis yog -kev kuaj kev puas tsuaj (NDT):
automated ultrasonic (UT) thiab radiographic (RT) kuaj xyuas kom tsis muaj sub- deg flaws ua ntej txheej
Kev ntsuas siab:
100% kev ntsuas hydrostatic ntawm 90% ntawm cov txiaj ntsig kev ntxhov siab txheeb xyuas cov qauv xau- nruj
Hardness tswj:
Qhov tseem ceeb rau kev pabcuam qaub (H2S), qhov nyuaj yog capped ntawm kwv yees li 22 HRC los tiv thaiv sulfide kev nyuaj siab tawg (SSC)
5. Kev taw qhia kev xaiv
Rau faus X52 pipeline, 3PE nrog cathodic tiv thaiv yog tus qauv 50-xyoo tsim. FBE haum rau kev ua haujlwm siab dua thiab tseem yog lub hauv paus ntawm 3PE. Saum toj no hauv av, galvanizing lossis xim tshuab yog kev lag luam. Rau kev tiv thaiv sab hauv tiv thaiv dej los yog corrosive xov xwm, qhia ib qho epoxy los yog cement-mortar hauv ob sab phlu haum rau cov kua dej chemistry.
Cov lus nug nquag
Dab tsi yog qhov zoo tshaj plaws txheej rau faus X52 pipeline?
3PE (peb- txheej polyethylene) yog txheej txheem kev lag luam rau cov kab faus, sib txuas cov epoxy adhesion nrog polyethylene toughness thiab mechanical tiv thaiv.
Qhov txawv ntawm 3PE thiab FBE yog dab tsi?
FBE yog ib txheej epoxy; 3PE ntxiv cov nplaum nruab nrab- txheej thiab txheej txheej polyethylene rau cov khoom siv zoo tshaj plaws thiab kev tiv thaiv ya raws.
Puas yog galvanizing haum rau faus cov kav dej?
Galvanizing suits atmospheric thiab dej kev pab cuam; rau cov kab faus, 3PE lossis FBE nrog kev tiv thaiv cathodic feem ntau tau teev tseg.
Vim li cas moj tej tawg tu rau Sa2.5 yuav tsum tau?
Nws tshem tawm zeb nplai, xeb thiab roj thiab tsim cov thauj tog rau nkoj profile uas muab cov txheej rau nws lub zog adhesion.
X52 yeeb nkab puas tuaj yeem coated rau kev pabcuam qaub?
Txheej ib leeg tsis txaus - kev pabcuam qaub kuj xav tau cov khoom siv PSL2 nrog kev txwv hardness thiab HIC / SSC kuaj.
Cov txheej txheem zoo li cas raug txheeb xyuas?
Los ntawm hnub so (tshwj xeeb) kuaj rau pinholes, kuaj adhesion, thiab ntsuas thickness raws li cov txheej txheem txheej txheem.
