A possibility of extending the time between overhauls period of a compressor unit on a ship from the Seismic Industry by using pre-synthesized predictive mathematical models is considered. The latter are created by processing experimental data and refer to cases of before and after overhaul of the Seismic compressor. In part one, results of synthesizing predictive mathematical models of the relationship between the duration of the operating time of the Seismic compressor and the pressure change in the first stage – screw compressor are proposed. In Part Two, results of synthesizing predictive mathematical models of the three piston stages of the Seismic Ship compressor are proposed.