Del. Code tit. 16 § 7208
Any liquefied petroleum gas containers placed upon land, whether aboveground or underground, by a person other than the owner of the land, pursuant to a lease or bailment agreement between the owner of the land and the person placing such containers on the land, shall remain movable property during the term of such lease or bailment, and the ownership thereof shall not be affected by the sale, either private or judicial, through foreclosure, execution process or otherwise, of the land upon which they are placed, nor shall the ownership of such containers by the person placing them upon the land be subordinate to the rights of any purchaser of the land at any such sale. The owner of any liquefied petroleum gas container removed from any property under this section shall be responsible for filling in the hole resulting from the removal of such container.
16 Del. C. § 7208