1. Lub dismantling thiab decomposing lub lag luam tsuas yog yuav ua tau tom qab nws tau lees paub tias lub upstream thiab downstream pipelines ntawm lub pob valve tau depressurized.
2. Kev saib xyuas yuav tsum tau ua kom tsis txhob muaj kev puas tsuaj rau qhov sib khi ntawm qhov chaw, tshwj xeeb tshaj yog cov khoom tsis yog hlau, thaum lub sij hawm disassembly thiab reassembly. Cov cuab yeej tshwj xeeb yuav tsum tau siv thaum tshem O-ring.
3. Lub bolts ntawm lub flange yuav tsum tau nruj symmetrically, maj mam thiab tusyees thaum sib dhos.
4. Tus neeg saib xyuas yuav tsum sib haum nrog cov khoom siv roj hmab, cov khoom yas, cov khoom siv hlau thiab cov khoom nruab nrab ua haujlwm (xws li roj) hauv lub pob valve. Thaum qhov nruab nrab ua haujlwm yog roj, roj av (GB484-89) tuaj yeem siv los ntxuav cov hlau. Ntxuav cov khoom tsis yog xim hlau nrog dej ntshiab lossis cawv.
5. Lub decomposed ib feem yuav raug ntxuav los ntawm dipping. Cov khoom hlau uas tsis muaj qhov tsis zoo ntawm cov hlau tsis muaj hlau tuaj yeem txhuam nrog cov ntaub so ntswg huv thiab zoo impregnated nrog tus neeg saib xyuas (kom tiv thaiv cov fibers los ntawm kev poob thiab adhering rau qhov chaw). Thaum ntxuav, tag nrho cov roj, av, kua nplaum, plua plav, thiab lwm yam adhering rau phab ntsa yuav tsum tau muab tshem tawm.
