Compressor Selection Maps: scroll
Compressor selection maps per API 617/618/619 — operating envelopes, polytropic efficiency ranges, specific power, surge and turndown limits, molecular weight suitability, discharge temperature limits, capacity control methods, pulsation requirements, lubrication/maintenance intervals, and selection criteria for centrifugal, reciprocating, screw, scroll, diaphragm, and axial compressors
| compressor type | record id | adiabatic efficiency pct max | adiabatic efficiency pct min | adiabatic efficiency pct typical (%) | api standard | discharge pressure max psia (psia) | discharge pressure min psia (psia) | discharge temp max F (degF) | flow max acfm (ft^3/min) | flow min acfm (ft^3/min) | maintenance interval hr (hr) | molecular weight max (g/mol) | molecular weight min (g/mol) | notes | parameter category | polytropic efficiency pct max (%) | polytropic efficiency pct min (%) | polytropic efficiency pct typical (%) | pressure ratio per stage max (dimensionless) | pressure ratio per stage min (dimensionless) | size class | specific power bhp per 100cfm (hp/(100 ft^3/min)) | speed rpm max (rpm) | speed rpm min (rpm) | turndown pct max (%) | turndown pct min (%) | typical applications |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| scroll | operating_envelope | 70 | 60 | 65 | None | 200 | 15 | 300 | 200 | 1 | 12,000 | 50 | 2 | Fixed compression ratio; no valves; very quiet; near 100% volumetric efficiency at design point; poor part-load efficiency if pressure ratio varies; oil-free versions available; orbit scroll displacement 10-200 cc | operating_envelope | 75 | 65 | 70 | 3 | 1.5 | all | 25 | 6,000 | 1,500 | 100 | 0 | HVAC refrigeration, small instrument air, medical/dental air, food processing |
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