⁃ area distillation ---> The control system with air control. Activities at risk Cleaning a distillation tower as methanol. From the Ladle Refining Oil with methanol. Heat a mixture of methanol will evaporate. Subject to precipitation of salts or oil vapor of methanol surviving. To remain on top of the tower When the tower opens Originally to be cleaned with a closed system. when oxygen To meet the fuel that sparks cause fire. 2. Working in confined spaces. 3 moving equipment inside the tower from a height down to clean. Such as pall ring demister pads to clean the outside of the tower.