Hauv kev ua haujlwm ntawm pipeline engineering, flanges, raws li cov khoom tseem ceeb rau kev sib txuas cov kav dej, muaj ntau hom thiab kev ua haujlwm. Ntawm lawv, pob tw welded flanges tau dhau los ua "cov khoom lag luam hnub qub" hauv cov raj xa dej vim lawv qhov kev ua tau zoo thiab kev siv dav dav.

Vuam flange, tseem hu ua siab caj dab flange, yog qhov tshwj xeeb hauv qhov ntev thiab inclined siab caj dab txuas los ntawm qhov chaw vuam ntawm flange thiab cov yeeb nkab (raws li qhia hauv daim duab schematic). Kev tsim qauv ntse ntawm lub caj dab siab no tsis yog tsuas yog txhim kho qhov nruj thiab lub zog ntawm flange, tab sis kuj tseem ua kom muaj kev ntxhov siab tsis tu ncua, ua kom muaj kev ruaj ntseg thiab sib khi ntawm flange nyob rau hauv high-pressure, high-temperature, los yog low-temperature ib puag ncig. Lub puab lub qhov tsim yog me ntsis loj dua li sab nraud txoj kab uas hla ntawm lub raj xa dej, ua rau nws yooj yim dua rau lub pob tw vuam, thaum lub voj voog ncig lub vuam seam spans ob sab hauv thiab sab nraud ntawm flange, ntxiv dag zog rau kev sib khi.

Vim cov qauv tsim tau zoo, pob tw welded flanges tshwj xeeb yog tsim rau kev kub siab, kub-kub, lossis kub qis hauv kev lag luam xws li roj av, tshuaj lom neeg, thiab nkoj tsim khoom. Nws tuaj yeem tiv taus qhov hloov pauv loj hauv siab thiab kub, ua kom muaj kev ruaj ntseg ntawm cov kav dej. Lub caij no, lub pob tw welded flanges kuj tseem siv tau rau hauv cov kav dej rau kev thauj cov nplaim taws, tawg, lossis cov tshuaj lom neeg, thiab lawv cov kev ua tau zoo sealing muaj kev lav phib xaub rau kev thauj mus los nyab xeeb ntawm kev tshaj tawm.

Raws li cov qauv tsim, pob tw welded flanges yuav tsum ua raws li cov kev cai nruj xws li JB4726-4728. Raws li qhov sib txawv nominal pressures thiab cov ntaub ntawv, cov qib forging ntau ntawm Qib I txog Qib III kom ntseeg tau tias qhov kev ua tau zoo ntawm flange hauv qhov chaw ua haujlwm sib txawv. Tsis tas li ntawd, txoj kab nqes sab nraud ntawm lub caj dab ntawm welded flange yuav tsum tsis pub tshaj 70 °. Cov qauv tsim no pab tswj cov txheej txheem nruj me ntsis thaum lub sijhawm tsim khoom thiab vuam txheej txheem, tag nrho siv lub luag haujlwm thiab tus nqi ntawm flange.