Abstract: 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.

Abstract: This invention relates to rolling and in particular to the process of rod coil forming, for instance, of steel and nonferrous metals, and to a set of equipment for its realization. The method of rod coil forming includes continuous rod feeding through a wire-rod guide, forming of waps with a variable diameter by means of speed variation of wire-rod guide rotation and stacking of waps by horizontal layers throughout the height of a coil. The difference of the applied method is in the fact that the rod is fed at a speed of 35-300 m/s. Forming of waps with a variable diameter is realized under the influence of dynamic forces by means of rod declination at the wire-rod guide outlet at an angle of 15-80° with the axis of rotation and its following feeding in a curved concave path with rotation at an angle of 80-90° with the axis of wire-rod guide rotation, in this case speed of wire-rod guide rotation is varied with respect to the following ratio: ? ? ? ? ? 0.

Abstract: This invention relates to rolling and in particular to the process of rod coil forming, for instance, of steel and nonferrous metals, and to a set of equipment for its realization.