Four sub-systems, not one machine: starting air 2.5–3.0 MPa (piston), control air 0.7 MPa, service air 0.7–1.0 MPa and instrument air at −40 °C PDP. Size backwards from the duty list with simultaneity factors and pressure staging.
- Separate starting, control, service and instrument air before selecting machines.
- Use simultaneity factors (tools 0.2–0.4, purge 0.1–0.3) plus 10–20% leakage margin.
- Stage pressures: do not supply 0.3 MPa purge at 0.8 MPa.
- Specify pressure dew point, not atmospheric dew point.
- N+1 for continuous platforms; independent instrument-air receiver.
Full engineering article available in Chinese; send us your duty list for a sized proposal.