Present invention relates to the field of a storage tank design and can be used in the construction of tanks for storing light ends and, preferably, for storing gasoline. The claimed tank for storing petroleum products consists of a body, a roof and a floating protective cover comprised of a plurality of floating elements in the form of solids of revolution having the same shape. In the tank, a portion of the floating elements of the protective cover is situated below the surface of the liquid, and a portion is situated in the gas space of the tank. The distinguishing feature of the proposed invention is the floating elements, which differ from one another in shape and size by not more than 5%. Furthermore, the floating elements that make up the floating protective cover have a centre of flotation that is offset from their geometric centre. All of the elements of the protective cover are made of non-sparking metal. The technical result of the invention is that of reducing the rate of evaporation of the liquid and the concentration of vapors, suppressing the process of combustion and preventing the possibility of electrostatic buildup and spark discharge between the floating elements.

Present invention relates to the field of a storage tank design and can be used in the construction of tanks for storing light ends and, preferably, for storing gasoline. The claimed tank for storing petroleum products consists of a body, a roof and a floating protective cover comprised of a plurality of floating elements in the form of solids of revolution having the same shape. In the tank, a portion of the floating elements of the protective cover is situated below the surface of the liquid, and a portion is situated in the gas space of the tank. The distinguishing feature of the proposed invention is the floating elements, which differ from one another in shape and size by not more than 5%. Furthermore, the floating elements that make up the floating protective cover have a centre of flotation that is offset from their geometric centre. All of the elements of the protective cover are made of non-sparking metal. The technical result of the invention is that of reducing the rate of evaporation of the liquid and the concentration of vapors, suppressing the process of combustion and preventing the possibility of electrostatic buildup and spark discharge between the floating elements.

The invention relates to a biofilm based panel that is developed for reducing evaporation in dam reservoirs, and allows biomass production. The biofilm based panel of the invention comprises in general three main layers, a support layer (4), a nutrient layer (2) and a biofilm layer (1). Based on the climate in which the dams are located, a heat storage intermediate layer (3) may also be added. The support layer (4) is the top layer. The developed panel is positioned such that it partially covers the water surface.

The invention relates to a biofilm based panel that is developed for reducing evaporation in dam reservoirs, and allows biomass production. The biofilm based panel of the invention comprises in general three main layers, a support layer (4), a nutrient layer (2) and a biofilm layer (1). Based on the climate in which the dams are located, a heat storage intermediate layer (3) may also be added. The support layer (4) is the top layer. The developed panel is positioned such that it partially covers the water surface.