Definitions for "PISTON DISPLACEMENT"
of a reciprocating compressor cylinder is the net volume displaced by the piston at rated machine speed, generally expressed in cfm. For single-acting cylinders it is the displacement of the compressing end only. For double-acting cylinders it is the total of both ends. For multistage compressors, the displacement of the first stage only is commonly stated as that of the entire machine.
Net volume actually displaced by the compressor piston at rated machine speed, generally expressed in cubic feet per minute (usually CFM). For multistage compressors, the piston displacement of the first stage only is commonly stated as that of the entire machine. ( 060)
Total volume displaced as the piston moves in the cylinder from bottom dead centre to top centre dead.