What is the recommended practice for cleaning a fuel tank before welding?

Cleaning a fuel tank before welding is crucial to ensure safety and prevent any harmful reactions. The recommended practice of steam cleaning the tank interior serves several purposes.

First, steam cleaning effectively removes residual fuel, oils, and contaminants that may remain inside the tank. The high temperature of the steam helps to evaporate and dislodge these substances, ensuring that the interior surfaces are free of flammable materials before welding takes place.

Additionally, steam cleaning disinfects the tank by removing any biological contaminants such as bacteria and algae, which can thrive in the presence of fuel. This level of cleanliness is essential to minimize the risk of fire or explosion during the welding process.

In contrast, other options may not adequately address the necessary level of cleanliness or safety. Flushing with clean water could leave water residues that might interfere with the weld or lead to rust. Purging with air might not effectively remove all flammable vapors, and using industrial detergents might introduce additional chemicals that could interact poorly during welding. Therefore, steam cleaning is the preferred method to achieve a thorough and safe cleaning in preparation for welding a fuel tank.