Abstract: A subsea system includes a first foundation structure supporting a first compressor train and having a connection interface for connecting to a second foundation structure supporting an additional compressor train. The first compressor train includes a first compressor having an inlet connectable via a fluid line to a well flow line. A compressed fluid line having a flow regulation device is connected to an outlet of the first compressor and to a common outlet for compressed fluid. A first connection line is connected to the compressed fluid line at a position upstream of the flow regulation device, and a third connection line is connected to the fluid line at a position upstream of the first compressor. Each of the first and third connection lines includes a flow regulating device and is configured to connect to the additional compressor train.

Abstract: The invention relates to a method of installing a subsea system (1) comprising the steps of: —installing at least one first foundation structure (13?) on a seabed, wherein the first foundation structure (13?) comprises a connection interface (50?) connectable to a second foundation structure (13?), —installing a first compressor train on the foundation structure (13?), the first compressor train comprising at least a first compressor (8?), —connecting the first compressor train to at least one well flow line (2), —connecting a first compressed fluid line (9?) to an outlet (15?) of the first compressor (8?) and to a common outlet (16) for the compressed fluid in the subsea system (1), wherein the first compressed fluid line (9?) comprises a flow regulating device (24?), —connecting a first connection line (10?,12?) to the first compressed fluid line (9?) at a position upstream of the flow regulating device (24?) and/or to a line (2, 6?) at a position upstream of the first compressor (8), and wherein the first