Ob lub kauv steel kav thiab steel phaj dov kav yog welded steel kav, tab sis lawv txawv heev nyob rau hauv ntau lawm txheej txheem.
Kauv steel kav yog tsim los ntawm steel kauj raws li raw khoom, tsim los ntawm extrusion ntawm ib txwm kub, thiab welded siv lub automatic ob-xaim ob-sided submerged arc vuam txheej txheem los tsim kauv seam steel kav. Qhov ntev ntawm kauv steel kav feem ntau yog 12 meters, thiab lawv tau xa thiab ntsuas los ntawm qhov ntev, nrog cov lus qhia tshwj xeeb feem ntau siab dua 219mm.
Hlau phaj dov cov kav dej txais yuav cov txheej txheem tee vuam thiab tuaj yeem tsim cov kav hlau nrog txoj kab uas hla saum 400mm thiab phab ntsa thicknesses ntawm 8-100mm. Lawv feem ntau tsis ua kom ntev ntev thiab feem ntau xa thiab ntsuas los ntawm qhov hnyav.
Cov qauv khoom siv rau steel phaj dov cov kav dej suav nrog GB / T 50205-2001, GB / T3092-2001, thiab lwm yam. Cov kav dej dov tau dav siv hauv roj av, tshuaj, hluav taws xob xa mus, pawg tsav tsheb, dej hauv nroog, cua sov, khoom siv roj, thiab lwm yam kev siv engineering.
Tus nqi ntawm steel phaj dov cov kav dej ntawm tib qhov tshwj xeeb yog siab dua li cov kav hlau kav. Steel phaj dov kav yog tsuas yog siv nyob rau hauv kev lag luam uas tsis ua raws li tus qauv specifications los yog yuav tsum tau thicker phab ntsa thicknesses.
Kauv steel kav tsis muaj qhov kev txwv ntawm lawv lub neej kev pab cuam; kev pabcuam lub neej yog feem ntau cuam tshuam nrog kev ua haujlwm ib puag ncig thiab cov txheej txheem tsim khoom. Txhawm rau kom ntev kev pab cuam lub neej ntawm kauv steel kav ua haujlwm nyob rau hauv ib puag ncig hnyav, kev tiv thaiv corrosion yog siv rau sab nrauv phab ntsa thiab sab hauv txoj kab uas hla ntawm cov kav dej.
Anti-corrosion kauv steel kav xa mus rau cov kav dej ua tiav los ntawm cov txheej txheem los tiv thaiv corrosion, uas tuaj yeem tiv thaiv kom tsis txhob muaj kev cuam tshuam los ntawm cov tshuaj lom neeg lossis cov tshuaj electrochemical thaum thauj thiab siv. Anti-corrosion kauv steel kav tuaj yeem tiv thaiv lossis ua kom qeeb corrosion, txuas lub neej kev pab cuam ntawm cov kav dej steel, thiab txo cov nqi ua haujlwm.
Feem ntau siv corrosion-resistant coatings rau steel pipelines nyob rau hauv Tuam Tshoj muaj xws li roj av asphalt, PE tsho thiab PE ua npuas ncauj tsho, epoxy thee tar, thee tar enamel, epoxy hmoov, thiab peb-txheej composite lug, epoxy coal tar txias-applied daim kab xev (PF hom. ), roj hmab-yas epoxy coal tar txias-applied daim kab xev (RPC hom), thiab lwm yam. Tam sim no, feem ntau dav siv pipeline corrosion tiv thaiv txoj kev yog peb-txheej PE composite lug, ib txheej epoxy hmoov, PF hom txias-applied daim kab xev, thiab RPC hom txias-applied daim kab xev.
Petroleum asphalt yog dav muaj thiab tsis tshua muaj nqi. Txawm li cas los xij, kev ua haujlwm tsis zoo, qhov tsis zoo yog qhov nyuaj rau kev lees paub, thiab ib puag ncig muaj kuab paug hnyav.
Epoxy thee tar yog ib qho yooj yim rau kev khiav lag luam, tab sis lub txheej muaj lub sij hawm ntev kho, cuam tshuam rau ib puag ncig, thiab tsis haum rau kev ua haujlwm; Nws yog qhov nyuaj rau kev tsim kho ntawm qhov kub qis dua 10 degree.
Epoxy hmoov corrosion tiv thaiv txais electrostatic txau, uas muaj fusion zoo thiab muaj zog adhesion nrog cov kav dej tiv thaiv los ntawm tib cov khoom. Txawm li cas los xij, epoxy hmoov muaj cov dej tsis zoo (cov dej nqus dej siab, ncav cuag 0.83%), ua rau muaj teeb meem rau kev tiv thaiv cathodic. Cov kev xav tau siab rau cov khoom siv hauv tsev, kev ua haujlwm nyuaj, thiab kev tswj kom zoo.
3PE cov khoom siv cua sov-shrinkable muab cov sealing muaj zog, muaj zog txhua yam, muaj zog dej tsis kam, ruaj khov zoo, yooj yim siv, siv tau zoo, thiab tsis muaj kuab paug ib puag ncig rau kev tiv thaiv cov kav dej. PE muaj qhov nqus dej tsawg (tsawg dua 0.01%) thiab sib xyaw ua ke siab epoxy zog, tsis tshua muaj PE dej nqus, thiab ua kom yooj yim ntawm cov nplaum kub yaj, muab kev tiv thaiv corrosion siab. Qhov tsis zoo yog tus nqi siab piv rau lwm cov ntaub ntawv sib koom ua ke.
PF hom thiab RPC hom txias-applied tapes yog ib qho yooj yim los tsim, thiab peb hom formated adhesives tso cai rau PF hom epoxy coal tar txias-dawb daim kab xev siv nyob rau hauv ib puag ncig, lub caij, los yog kub kub.
Cov yam ntxwv ntawm daim kab xev txias thiab 3PE tshav kub-shrinkable daim kab xev yog tias lawv tsim nyog rau cov kav dej nrog ntau yam khoom siv lub cev tiv thaiv txheej txheej, thaum lwm txoj hauv kev tsim nyog rau cov kav dej nrog cov khoom qub lossis cov khoom zoo sib xws lub cev tiv thaiv txheej txheej.
Nrog kev txhim kho, qee cov kav dej yuav tsum tau rwb thaiv tsev nrog rau kev tiv thaiv corrosion. Petroleum yog ib qho kev sib xyaw ua ke uas yooj yim corrodes pipelines, ua rau kev tiv thaiv corrosion tsim nyog. Txawm li cas los xij, cov kav dej ua kom zoo dua qub kuj xav tau kev rwb thaiv tsev ntxiv rau kev tiv thaiv corrosion. Nyob rau sab qaum teb sab hnub tuaj thiab lub caij ntuj no, thermal expansion thiab contraction tuaj yeem ua rau cov kav dej khov thiab tawg, cuam tshuam rau cov khoom ruaj khov.
