Kev tiv thaiv corrosion yog qhov loj tshaj plaws nyob rau hauv lub neej- lub voj voog tus nqi ntawm cov kav dej faus los yog hauv qab, thiab 3PE Coating Anti-Corrosion Insulation Steel Tube yog cov tsev neeg txheej txheej feem ntau teev rau nws. Kab lus no piav qhia txog cov txheej txheem txheej txheej, nws cov txheej txheem txheej txheem, cov qauv kev tswj hwm, thiab kev tshuaj xyuas thiab tuav cov cai uas ua rau cov txheej txheem ua haujlwm tau ntau xyoo.
Txheej thiab cathodic tiv thaiv ua ke tswj kav kav dej corrosion.
3LPE ua ke nrog FBE primer, txheej nplaum thiab polyethylene topcoat.
Kev npaj deg rau Sa 2.5 txiav txim siab ntev npaum li cas cov txheej txheem.
Soj ntsuam xyuas, adhesion thiab thickness kuaj xyuas cov txheej txheej.
Cov pob qij txha hauv teb yog coated tom qab girth welding thiab hnub so kuaj ua ntej rov qab ua dua.
Vim Li Cas Kab Yeeb Yuav Tsum Tau Txheej Txheej Sab Nraud
Cov pa roj carbon steel kav hauv av lossis dej hiav txwv corrodes los ntawm cov tshuaj electrochemical uas tau nrawm los ntawm cov dej noo, chlorides, cov kab mob thiab cov dej ntws tawm. Cov txheej txheej sab nraud yog thawj kab ntawm kev tiv thaiv: nws cais cov hlau los ntawm electrolyte, thiab nws ua haujlwm ua ke nrog cathodic tiv thaiv (CP) kom txhua qhov chaw liab qab ntawm lub hnub so txheej yog tiv thaiv los ntawm CP system. Cov txheej txheej tsim tau zoo txo qis CP tam sim no xav tau thiab txuas ntxiv lub neej ntawm tag nrho cov kav dej.
Cov Txheej Txheem Txheej Txheem rau Kab Yeeb
Feem ntau cov tshuab yog fusion bonded epoxy (FBE), peb- txheej polyethylene (3LPE), peb- txheej polypropylene (3LPP) thiab, rau cov kev pabcuam tshwj xeeb, thee tar enamel thiab kua epoxy. FBE muab adhesion zoo heev thiab yog tus qauv ib zaug -txheej txheej xaiv rau nruab nrab kub; 3LPE thiab 3LPP ntxiv txheej txheej polyolefin saum toj kawg nkaus rau kev ua haujlwm zoo hauv kev tuav, trenching thiab rocky backfill. 3LPP haum rau cov kev pabcuam kub dua.
3LPE Layer Structure
Lub 3LPE txheej muaj peb txheej ua haujlwm: FBE primer uas khi tshuaj lom neeg rau lub moj tej tawg -ntxuav steel nto, txheej copolymer nplaum uas khi cov primer rau topcoat, thiab polyethylene topcoat uas muab cov neeg kho tshuab thiab noo noo barrier. Tag nrho cov tuab tuab yog 2.5 txog 3.7 hli rau 3PE ntau yam uas tau teev tseg hauv ISO 21809-1, nrog cov chav kawm tuab xaiv los ntawm cov yeeb nkab txoj kab uas hla thiab kev pabcuam hnyav. Cov txheej txheem txheej yog siv rau hauv ib qho kev cog qoob loo txuas ntxiv tom qab cov yeeb nkab saum npoo yog moistened huv si rau Sa 2.5 thiab preheated.
Txheej txheej thov txheej
Daim ntawv thov pib nrog kev npaj saum npoo: cov yeeb nkab raug tua blasted kom huv si ntawm Sa 2.5 thiab cov txheej txheem thauj tog rau nkoj, ces preheated. FBE hmoov yog sprayed electrostatically mus rau qhov kub thiab melts rau hauv ib tug tas mus li zaj duab xis; cov nplaum thiab polyethylene yog ces extruded los yog sab -extruded tshaj primer thaum lub qhov rais kub yog khaws cia. Cov txheej txheem tsis, tshwj xeeb tshaj yog qhov kub thiab txias ntawm txhua qhov chaw nres tsheb, raug kaw rau ib lub yeeb nkab kom cov txheej txheej yog tag nrho traceable.
Kev tshuaj xyuas thiab kev ntsuam xyuas cov txheej txheem siv
Cov kav dej coated raug tshuaj xyuas rau cov pinholes nrog lub siab - qhov ntsuas hluav taws xob hnub so, rau kev sib khi los ntawm V- txiav los yog rub tawm, thiab rau tuab nrog lub ntsuas hluav taws xob. Khoov kev kuaj ntawm cov qauv txheej, kev kuaj xyuas qhov cuam tshuam thiab kev kuaj cathodic disbondment ib ISO 21809-1 lossis DIN 30670 xyuas kom meej tias cov txheej txheem siv tau raws li qhov tshwj xeeb. Cov hlua kawg yog sab laug ntawm cov yeeb nkab kawg rau vuam; cov no yog coated nyob rau hauv daim teb tom qab girth weld tiav.
Kev tuav pov hwm, kev ruaj ntseg thiab kev sib koom ua ke
Coated yeeb nkab yuav tsum tau nqa nrog dav nylon slings los yog padded diav rawg; chains thiab liab qab hooks txiav los ntawm polyethylene thiab nthuav cov hlau. Thaum lub sijhawm khaws cia, cov kav dej tau muab tso rau ntawm cov ntoo lossis roj hmab txhawb nqa thiab cov txheej txheem raug kuaj xyuas qhov kev puas tsuaj ua ntej yuav txo qis rau hauv trench. Cov pob qij txha hauv teb muaj kev tiv thaiv nrog cua sov- lub tes tsho ntsws, cov kua epoxy lossis FBE thaj ua rau thaj ua rau lub hauv paus txheej txheej txheej, thiab qhov ua tiav kev sib koom ua ke yog hnub so ua ntej rov qab ua dua.
Cov lus nug nquag
Peb- txheej polyethylene: fusion bonded epoxy primer, txheej txheej copolymer thiab polyethylene topcoat, siv rau hauv ib txheej txheem cog.
Nyob ntawm cov chav kawm thiab txoj kab uas hla, tag nrho cov tuab yog feem ntau 2.5 mus rau 3.7 hli, nrog FBE primer, nplaum thiab topcoat txhua tus pab txhawb ib qho kev qhia raws li ISO 21809-1.
FBE bonds chemically rau moj tej tawg -hlau steel thiab muab lub kaw lus nws adhesion thiab cathodic disbondment kuj; cov txheej polyolefin ib leeg tsis muaj kev ntseeg siab rau cov hlau liab qab.
Standard 3LPE haum rau kev pabcuam txuas mus txog li 60-80 ° C nyob ntawm qhov system; saum toj no, 3LPP lossis lwm lub tshuab kub kub yuav tsum raug ntsuas.
Los ntawm hnub so (pinhole) nrhiav kom tau ntawm high voltage, adhesion test, thickness measurement and sample tests xws li cathodic disbondment, impact and bending per the governance standard.
Yog lawm. Cov txheej tsis zoo tag nrho ntawm lub raj xa dej; CP tiv thaiv cov hlau thaum hnub so thiab qhov tsis xws luag, thiab ob lub tshuab ua ke txhais cov kev tswj xyuas corrosion.
