What precautions should be taken before welding on tanks containing flammable materials?

Filling the tank with water or rendering it non-explosive is a crucial precaution before welding on tanks that previously contained flammable materials. This method significantly reduces the risk of combustion or explosions by eliminating flammable vapors or residues that could ignite during the welding process. By either filling the tank with water or using other methods to ensure that the environment within the tank is non-explosive, it creates a safer working condition.

This approach also addresses the need to eliminate any potential spark sources during welding, as the presence of flammable materials can lead to hazardous situations. It is essential to ensure that any residual materials that could combust are adequately managed before beginning such operations. This process aligns with safety regulations and best practices in industries where welding on storage tanks is necessary.