VOC emissions control and development new methods for hydrocarbons losses prevention under tank storage is one of the important ways of the fuel and energy resources saving. A significant source of oil resources saving is VOC emissions losses prevention during their recovery, processing, transportation and storage in tank batteries. Control of hydrocarbons losses would result in saving about 20% of world hydrocarbon and energy resources and also prevent a negative ecological impact which grows out environmental pollution by oil products. Therefore losses control gives not only economic benefit, but also allows creating an environmentally friendly storage technology. Unfortunately, use of modern storage systems involves many constructive and technological difficulties such as floating roof jamming, losses of hydrocarbons within the tank walls, pollution of stored products by impurities from the atmospheric air, etc. The objective of this project was experimental study and mathematical simulation for developing new energy saving technology of hydrocarbons storage in tanks. Project was based on theoretical and laboratory researches on development of special device for storage tanks with adjustable gas equalizing system in order to prevent VOC emissions and atmosphere pollution. In this research project the basis of industry technology of hydrocarbons storage with adjustable gas gathering and equalizing system was developed. A systematic and fundamental study of rheophysical properties and hydrodynamic behavior of oil products was conducted in this project. Laboratory experiments were carried out to determine important evaporation properties of the test hydrocarbons using both the standard commercial and in-house made equipment. The obtained results will provide the valuable information for mathematical and Computational Fluid Dynamics (CFD) simulation of the hydrocarbon fluids flow in pipes and tanks under loading operations. As a result of the project we developed a special device - inflatable reservoir pontoon to prevent for hydrocarbon emissions in reservoir batteries of the oil recovery and refinery plants.