I have a 30,000 liquid tank that sprung a leak. It is only 3 years old and the steel all around the hole is strong, thinking there was an impurity in the steel. I want to weld the tank... the tanks are vented out of a 2" hole in the top. I have the ability to lower the level of the liquid in the tank to maybe 7 or 8 feet below the hole. the hole is maybe the size of a pen top... can I weld it with out a chance of explosion? Also I will be 30 feet in the air in a tellahandler bucket..