This paper summarizes oil vapor cleaning method, isolation method and the key points of implementation during the welding of oil depot equipment.

Cleaning of the surface is in the form of bubble formation on the part that vaporizes the chemical in order to react the oxidizer in the vapor state to the exposed surface at the bubble growth area.

It can remove the gravel covered surface impurities, while destruction of water vapor coated layer of sand to facilitate the dehydration, the role played efficient washing sand cleaning.