The presence of non-condensing gases in the refrigeration system is one of the reasons that disturb the normal operation of the refrigeration system. Their harmful effect is manifested in increase of condensation pressure, intensification of corrosion, deterioration of heat transfer in heat exchangers, increase of power consumption and operating costs for generation of cold.It is impossible to avoid the presence of air in the refrigeration system: it enters the units and compressors during repair work, as well as through leaks in joints and gland seals. When air and other non-condensing gases are removed directly from the refrigeration system components, there is lost a big quantity of the refrigerant, which among other things creates the problem of environmental pollution, and at ammonia facilities - the problem of safety of servicing personnel. That is why, "Safety rules for ammonia refrigeration facilities" PB 09-595-03 regulate using of special apparatus - air separator.