Steel Pipe Coating Guide - FBE 3LPE 3LPP Cement Lining

Hlau yeeb nkab corrosion yog cov txheej txheem electrochemical uas cov hlau atoms nyob rau hauv cov hlau react nrog oxygen thiab dej los tsim hlau oxides (xeb). Cov tshuaj tiv thaiv no yog nrawm los ntawm chlorides, acids, thiab kub siab. Hauv cov kav dej faus lossis hauv dej, kev xeb tuaj yeem ua rau phab ntsa nyias nyias ntawm tus nqi ntawm 0.1-1.0 hli hauv ib xyoos nyob ntawm cov av corrosivity, ua rau xau thiab kev puas tsuaj loj yog tias tsis kuaj xyuas. Anti-corrosion coatings muab ib qho kev thaiv ntawm cov hlau nto thiab corrosive ib puag ncig, tiv thaiv cov tshuaj tiv thaiv electrochemical tsis tshwm sim.

Kev rov qab los ntawm kev nqis peev rau cov yeeb nkab txheej yog qhov tseem ceeb. Cov kav dej coated nrog 30-50 xyoo tsim lub neej yuav raug nqi 5-15% ntau tshaj li cov kab uas tsis muaj coated, tab sis zam cov nqi loj heev ntawm kev kho cov xau, cov khoom poob, kev tu ib puag ncig, thiab kev puas tsuaj rau lub koob npe nrov. Piv txwv li, tus nqi ntawm ib qho kev cuam tshuam txog cov kav dej tsis ua haujlwm tuaj yeem tshaj tus nqi ntawm cov txheej txheem tag nrho cov kav dej. Ntxiv nrog rau kev ua haujlwm tsis zoo, ntau txheej txheej muab cathodic disbondment tsis kam, tso cai rau cov txheej txheem ua haujlwm ua ke nrog cathodic tiv thaiv (CP) systems rau txhim kho kev tiv thaiv corrosion.

Kev xaiv cov yeeb nkab txheej yog nyob ntawm kev ua haujlwm kub, qhov chaw faus neeg, kev thauj khoom txhua yam, thiab tus nqi. Cov txheej txheem loj muaj xws li:

Txheej hom	Qhov kub thiab txias	Hom Thickness	Daim ntawv thov tseem ceeb	Cov qauv
FBE (Fusion Bonded Epoxy)	-40 rau 120 degree	300-600 μm	Cov kav dej faus, dej system	ISO 21809-2, CSA Z245.20
3LPE (Peb-Txheej Polyethylene)	-40 rau 80 degree	2.0-3.7 hli	Hla - lub teb chaws roj & roj kav	TS EN ISO 21809-1, DIN 30670
3LPP (Peb- Txheej Polypropylene)	-40 rau 140 degree	2.0-3.7 hli	Siab -temp, offshore, suab puam pipelines	TS EN ISO 21809-1, DIN 30678
Cement Mortar Lining	Mus txog 100 degree	6-25 hli	Haus dej, dej phwj tuaj	AWWA C205, ISO 4179

Fusion Bonded Epoxy (FBE) is a thermosetting powder coating applied by electrostatic spray to a preheated pipe surface. The pipe is heated to 220-250°C, and the powder particles melt and fuse on contact, flowing into a continuous film that cross-links and cures within seconds. The resulting coating has excellent adhesion to the steel substrate (typically >15 MPa rub-tawm lub zog), tshuaj lom neeg tsis kam, thiab yoog raws zoo. Ib qho - txheej FBE muab cov txheej tuab ntawm 300-600 μm. Dual-txheej FBE siv txheej thib ob nrog cov khoom sib txawv (xws li, txhim kho kev puas tsuaj rau cov pob zeb rov qab) rau tag nrho cov tuab ntawm 600-1000 μm.

FBE txheej yog cov neeg ua haujlwm ntawm cov raj xa dej, muab qhov zoo tshaj plaws ntawm kev tiv thaiv corrosion, adhesion, thiab nqi. Nws yog haum rau kev khiav hauj lwm kub ntawm -40℃mus rau 120℃thiab muab zoo heev cathodic disbondment kuj. FBE feem ntau yog xaiv rau cov kav dej faus rau hauv ib puag ncig nruab nrab, cov kab dej txhaj tshuaj, thiab cov roj xa hluav taws xob. Qhov kev txwv tseem ceeb yog qhov cuam tshuam tsis zoo piv rau 3LPE - FBE tuaj yeem raug puas los ntawm pob zeb rov qab tsis muaj kev tiv thaiv ntxiv.

Peb-Txheej Polypropylene (3LPP) siv tib lub peb- txheej txheej raws li 3LPE tab sis hloov cov polyethylene topcoat nrog polypropylene, uas muaj qhov kub thiab txias tsis kam (txog 140℃). Cov nplaum nplaum kuj yog polypropylene-raws li copolymer kom ntseeg tau tias kev sib raug zoo nrog PP topcoat. 3LPP yog siv nyob rau hauv siab -tej cov kav dej kub xws li cov kab txhaj tshuaj, cov roj kav dej hnyav (qhov twg cov roj tau rhaub rau kev thauj mus los), cov kav dej tawm sab nraud hauv dej tob (qhov twg cov yeeb nkab yuav tsum tau siab tshaj -pib 1{1}}pib {1} coatings), thiab suab puam pipelines raug rau siab hnub ci tshav kub.

Tus nqi ntawm 3LPP yog kwv yees li 15-25% siab dua 3LPE vim yog PP resin kim dua thiab nruj dua cov kev xav tau. Txawm li cas los xij, rau siab -qhov kub thiab txias, nws tsuas yog qhov kev xaiv uas tsis yog xim hlau txheej txheem xwb. 3LPP kuj tseem muaj kev txhim kho kev puas tsuaj piv rau 3LPE, ua rau nws haum rau cov kev taw qhia drilling thiab pob zeb struts txawm nyob rau hauv nruab nrab kub.

Cement mortar hauv ob sab phlu (tseem hu ua cement lining) yog siv rau sab hauv ntawm cov yeeb nkab steel rau kev pabcuam dej. Cov hauv ob sab phlu yog sib xyaw ntawm Portland cement, xuab zeb, thiab dej siv centrifugally (spinning cov yeeb nkab) mus rau ib lub thickness ntawm 6-25 hli (nyob ntawm txoj kab uas hla). Cov cement hauv ob sab phlu passivates cov hlau nto los ntawm lub siab pH ib puag ncig tsim los ntawm cov khoom siv cement hydration (feem ntau calcium hydroxide), tsim cov txheej txheem hlau oxide. Lub hauv ob sab phlu kuj muab ib tug du sab hauv nto uas txo cov kev sib txhuam losses thiab tiv thaiv tuberculation (xeb nodule tsim) uas tshwm sim nyob rau hauv unlined steel kav dej.

Cement hauv ob sab phlu yog txheej txheem txheej txheej rau cov kav dej xa mus thoob ntiaj teb. Cov qauv suav nrog AWWA C205 (US), ISO 4179 (International), thiab BS 534 (UK). Cov hauv ob sab phlu yog haum rau pH ntau ntawm 6.5-9.5 hauv dej thiab kub txog 100 degree. Thawj qhov tsis zoo yog txo qis hauv txoj kab uas hla (kwv thaj tsam txo), nce cov yeeb nkab hnyav, thiab qhov tsis zoo rau cov dej acidic (pH qis dua 6.5) uas tuaj yeem yaj cov cement matrix.

Kev xaiv txheej txheej yog nyob ntawm ntau yam. Kev khiav hauj lwm kub yog qhov kev txiav txim siab tseem ceeb: FBE txog li 120 degree, 3LPE txog li 80℃(txawm hais tias nws siv yog kub- txwv), thiab 3LPP txog li 140℃. Ib puag ncig faus - av corrosivity (resistivity, chloride cov ntsiab lus, noo noo), muaj pob zeb los yog ntse backfill khoom, thiab av nkos chemistry - txiav txim seb yuav tsum tau txhua yam robustness. Kev thauj mus los thiab kev teeb tsa - suav nrog kev tuav, khoov thaum lub sijhawm teeb tsa, thiab cov txheej txheem thev naus laus zis tsis muaj trenchless - dictate coating elasticity thiab impact resistance requirements. Kev txheeb xyuas tus nqi Lifecycle (LCC) yuav tsum txiav txim siab tsis yog tus nqi pib txheej nkaus xwb tab sis kuj tseem xav tau lub sijhawm tu, cathodic tiv thaiv kev sib cuam tshuam, thiab kev pheej hmoo tsis ua haujlwm ntawm lub neej tsim.

Txhua txheej txheej txheej pib nrog kev npaj nto los ntawm abrasive blasting rau Sa 2.5 (ze -} hlau dawb) kev huv ntawm ISO 8501-1, nrog rau qhov profile ntawm 75-150 μm. Tom qab blasting, cov yeeb nkab yog preheated nyob rau hauv ib tug induction cua sov kauj los yog roj- taws rauv rau qhov yuav tsum tau daim ntawv thov kub. Cov txheej txheem yog siv rau hauv cov txheej txheem ntau lawm uas tuaj yeem ua 20-100 kav dej hauv ib teev nyob ntawm txoj kab uas hla thiab txheej txheej. Kev tshuaj xyuas tom qab txheej txheej suav nrog kev ntsuas thickness (qhuav zaj duab xis thickness ntsuas ntawm ntau lub ntsiab lus nyob ib ncig ntawm lub voj voog), kev tshawb nrhiav hnub so (kev kuaj qhov hluav taws xob ntawm 5-25 kV nyob ntawm txheej txheej), thiab kev kuaj adhesion (txoj kev rub tawm ntawm ASTM D4541 lossis hla hla ntawm ASTM D3359).

ManufacturerPipe ua haujlwm Hoobkas- theem txheej txheej ntau lawm rau FBE, 3LPE, 3LPP, thiab cement mortar hauv ob sab phlu. Peb cov txheej txheem txheej tau ntawv pov thawj rau cov qauv siv tau thiab tuaj yeem ua cov yeeb nkab ntawm 2 "mus rau 48" txoj kab uas hla. Peb muab tag nrho cov ntawv tshaj tawm- txheej tshuaj ntsuam xyuas nrog rau kev ntsuas thickness, kuaj xyuas hnub so, thiab kev kuaj adhesion, nrog rau peb tus neeg tim khawv -. Coated yeeb nkab yog ntim nrog cov tiv thaiv kawg thiab npaj rau kev thauj mus los kom nyab xeeb kom tsis txhob muaj txheej txheej puas thaum thauj khoom.

Hu rau peb pab neeg txheej txheej rau cov kws tshaj lij kev xaiv thiab tus nqi sib tw ntawm FBE, 3LPE, 3LPP, thiab cov cement hauv ob sab phlu.

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