Abstract: Systems for cleaning a storage tank and fluid hydrocarbons stored within the storage tank comprise: a vehicle for transporting the system between sites having said storage tanks; a fluid cleaning circuit mounted with respect to said vehicle for extracting fluid hydrocarbons from the storage tank for cleaning; a settlement tank mounted with respect to said vehicle to be in fluid communication with the fluid cleaning circuit to receive contaminated fluid hydrocarbons for separation by gravity; wherein the fluid cleaning circuit is controllable to clean the fluid hydrocarbons and the storage tank and to dispose of any waste material extracted from the fluid hydrocarbons during the cleaning process and following disposal of the waste material the fluid cleaning circuit is configured to convert the settlement tank into a non-volatile environment prior to the vehicle leaving the site.

Abstract: Liquid hydrocarbon storage tanks are cleaned by transferring the most contaminated lower fuel layer to an external vessel on a treatment truck where separation into a contaminants portion and a fuel portion occurs. The remnant fuel in the storage tank is cleaned by multiple passes through an external circuit on the truck. The fuel from the vessel is sometimes returned to the remnant fuel to be cleaned. The contaminants are discarded. The initial separation shortens the cleaning cycle. A flexible dip tube stiffened by a guide rod allows probing of the storage tank floor.

Abstract: Liquid hydrocarbon storage tanks are cleaned by transferring the most contaminated lower fuel layer to an external vessel on a treatment truck where separation into a contaminants portion and a fuel portion occurs. The remnant fuel in the storage tank is cleaned by multiple passes through an external circuit on the truck. The fuel from the vessel is sometimes returned to the remnant fuel to be cleaned. The contaminants are discarded. The initial separation shortens the cleaning cycle. A flexible dip tube stiffened by a guide rod allows probing of the storage tank floor.