A turbine-driven reciprocating compressor and method of operating said compressor

A reciprocating compressor system is provided comprising: a turbine (115); a reciprocating compressor (103) driven by said turbine; and a gearbox (119) arranged between the turbine and said reciprocating compressor. The turbine is provided with a barring device (131) arranged for slow-turning said turbine during a barring phase. A clutch (125) is arranged between the turbine and the reciprocating compressor, for mechanically disconnecting the turbine from the reciprocating compressor during a transient phase of operation of said system.