How do you optimize compressor selection between centrifugal and reciprocating options?

Selection factors: flow rate (centrifugal >500 m3/h typically), pressure ratio (reciprocating handles higher per stage), gas molecular weight (centrifugal favors heavier gases), turndown requirements (reciprocating better), pulsation sensitivity of process, efficiency (often similar at design point), reliability philosophy, and maintenance capabilities. Economic analysis: centrifugal has lower maintenance but higher capital for small flows; reciprocating has higher maintenance but handles wide conditions. For hydrogen or light gases at high pressure ratio, reciprocating often preferred. Consider screw compressors for intermediate range.