The article deals with the calculation of prestressed reinforced concrete cylindrical tank with capacity of 200,000 m3 to store liquefied natural gas (LNG). The calculation is performed by using the finite element program complex "Lira-SAPR." For the purpose of considering the peculiarities of the work of such structures calculation was conducted in three phases: the initial phase was carried out a preliminary definition of the area of pre-stressed tendons and pitch of their arrangement on the height of the wall. Then - the preliminary determination of the intensity of the reinforcement ring beam coating with prestressed reinforcement. And in the end - the final calculation of prestressed concrete structures with the adjustment of the previous reinforcement. According to the results of calculating is obtained the reinforced concrete structure of the tank, which in the empty state, and in the stage of operation (filling LNG) stresses in the concrete does not exceed: in the compressed zones – the cylinder compressive strength, and in the stretched areas – tensile strength of concrete.

Keywords: tank, reinforced concrete constructions, calculation, Lira for Windows, prestressed reinforcement, liquefied natural gas