FIELD: gas and petroleum refining and producing industries; fluidics. SUBSTANCE: invention relates to jet facilities and provides maintaining of optimum operating conditions of plant. Proposed pump- ejector plant has at least two jet devices with gas and liquid inlets. Pump output is connected with liquid inputs of jet device. Separator is connected with outputs of all devices and with input of pump on gas and working liquid lines before corresponding inputs of jet devices. Each shutoff member is made for automatically opening and closing at rise and drop of pressure in gas main line to corresponding threshold value, these values being equal for pair of shutoff members of each jet device and are different for pairs of shutoff members of different jet devices. Pump is made for switching on and off at rise drop of pressure in gas main line to minimum indicated threshold value. EFFECT: improved reliability. 4 cl, 1 dwg
