The data pertained to seven-stage integrally geared compressors, compressing CO 2 from 1.9 bar to 150 bar , with inter-stage cooling applied to 32 • C . Different capacities of 1.5, 3, 6, and 12 MMtonnes/year were considered and quoted. For 1.5 and 3 MMtonnes/year, a single compression train was considered and for 6 and 12 MMtonnes/year 2 and 4 parallel trains were considered, respectively. The compressor cost model applied in the present study, cf. Table , is compared to the data from the CO2Europipe project in Figure .