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The design scheme is considered for a gas separator as used in oil extraction for the partial removal of gas from oil entering a submersed pump. Successive approximation is used in determining the characteristics with the use of an experimental factor ϕ, which incorporates the effects of the inlet section and flow separator on the performance. The calculated characteristics agree satisfactorily with experimental curves for high flow rates.Gas separators (GS) are used in oil extraction for the partial removal of the gas from the oil entering an immersed pump [1] (Fig. 1).For convenience in calculating the GS characteristics, we split the flow section into two parts: the input part and the separator proper (Fig. 2).In the inlet section, the volume flow rate of the liquid is Q l and that of the gas is Q g . When the GS works, the guides and rotating parts control the flow in the circumferential direction, while the large working wheel (WW) spirals the flow of liquid and gas at approximately the circumferential velocity of the WW and directs it to the separator, in which there is an annular space in which the flows separate: at the periphery, the liquid concentration increases, while at the center the same occurs for the gas.Usually the separator in a centrifugal GS contains radial plates that maintain the rotation of the flow, but recently there have been vortex GS without additional devices in the annular space. In both cases, the performance is dependent on the state of the flow at the inlet, i.e., on the hydrodynamic characteristics of the WW.We consider an approximate method of calculating the GS characteristics, which is based on schematizing the flows. The effects of the inlet section and the divider (in the head) on the performance are incorporated from the experimentally determined coefficient ϕ, which is close to 1 (ϕ ≈ 0.86 for effective GS).To simplify the flow scheme in the separator (Fig. 3), we assume that the flow is uniformly distributed at the inlet. In the outlet part of the separator proper, there is a flow splitter which divides the flow into two parts. All the liquid enters the peripheral part (annular channel, section 2-B), so one can assume that Q l2 = Q l1 .The flowing gas is divided into two parts. In the peripheral part, the volume flow rate is Q g2 ; then the gas passes together with the liquid to the pump, while the rest of the gas (the larger part) is collected in the output channel and discarded to the space between the tubes.A fairly complicated flow division occurs in the separator, which can be simplified as follows. We select point B in the inlet section in such a way that the section 2-B enters into the annular channel with a gas flow rate equal to the output one: Q g2B = Q g2 .