Nominal BHP, maximum allowable speed (RPM), and stroke length.
If you specify, buy, or design reciprocating compressors for refinery, gas plant, or pipeline service, you know the drill: The vendor sends a 20-page PDF datasheet. You need to compare three bids. Chaos ensues.
: Specifications for rotating parts, cylinders, and distance pieces.
Don’t just dump every API box into a sheet. Structure it for decision-making.