1. Tsis paub qhov tseem ceeb ntawm sludge tshuab ziab khaub ncaws;
2. Kev teeb tsa ntawm cov neeg ua haujlwm tswj tsis muaj kev nkag siab, tshwj xeeb tshaj yog kev teeb tsa ntawm cov neeg ua haujlwm lubrication, uas yog qhov tsis muaj zog heev hauv kev tswj cov sludge tshuab ziab khaub ncaws tam sim no;
3. Muaj qhov tsis muaj kev ua qauv zoo thiab ua tiav hauv kev tu tshuab ntawm lub tshuab ziab khaub ncaws, thiab ntau cov ncauj lus kom ntxaws saib xyuas tsis tuaj yeem siv rau hauv qhov chaw;
4. Kev saib xyuas ntawm qee cov khoom siv tsis raug raws sijhawm, uas ua rau kev laus ntawm cov khoom siv thiab cuam tshuam rau kev ua haujlwm ntawm cov tshuab ib txwm muaj, thiab tseem ua rau muaj kev phom sij rau lwm yam, uas tsis tsim nyog rau kev ua haujlwm zoo ntawm sludge tshuab ziab khaub ncaws.
