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The aim of this study is the calculation of the pipe diameter required to transfer the oil in the vertical parts of the cooling systems, at the desired cooling load and at the velocity of the minimum cooling liquid. For this purpose, the velocity of the minimum cooling liquid for the driftage of the oil in the pipes in the suction line (Vs,min) and the minimum cooling load (qs,min) have been studied. After the theoretical analysis as to the matter, in a system the cooling load of which 1 kW, for the copper pipes whose types are K and L, in place of the cooling liquids harming the ozon layer and leading to global warming, the environment-friendly, natural and alternative liquids R134A, R410A, R423A and R744 have been used. According to the results, as the pipe diameters increase, the velocity of minimum cooling liquid for the driftage of the oil increases. In addition to that, the load of the minimum cooling liquid increases, both the pipe diameters and the heat of the evaporator being increased. Cooling liquids being considered, the change of the velocities as R744