Allen Rechtzigel - Inver Grove MN
A method and device are provided for cleaning a storage tank for petroleum products of the type having a closed sidewall and a floating roof which floats upon the top of the petroleum products. Additionally, a plurality of downwardly depending legs are removably secured to the floating roof which engage the bottom of the storage tank when it is nearly empty thereby preventing the floating roof from contacting the bottom of the storage tank. The device includes an elongated nozzle having an upper end and a lower end with at least two spray jets adjacent its lower end. One of the legs is removed from the floating roof of the storage tank thereby forming an opening into which the nozzle is inserted so that its lower end is positioned adjacent the bottom of the storage tank. Thereafter, petroleum products under high pressure are pumped through the nozzle and thus through the spray jets. In doing so, the spray jets emulsify dirt, waxes, and other petroleum distillates which accumulate at the bottom of the tank.