The Panda design uses a single three-stage centrifugal compressor outputting dense phase CO 2 which is then pumped to pipeline pressure. The design includes heat integration using LP steam generated by the compressor intercoolers to flash rich solvent in the semi-lean amine system. This is very different from the Mustang design which uses two parallel three-stage reciprocating compressors with air cooling for interstage cooling. Equipment costs in the compression section were not subdivided with sufficient detail to evaluate whether the difference in costs is driven by the different compressor configurations or the heat integration. However, one key factor in the lower cost of the Mustang compression section is the lower compression ratio required for the CO 2 product stream. This is a result of the higher stripper operating pressure (5.2 bar) in the Mustang design made possible by the use of piperazine. This lower compression ratio as well as the greater turndown required in the Mustang design were factors in the choice of reciprocating compressors over centrifugal compressors.