R290 (Propane) pressure temperature chart (PT)
An R290 pressure temperature chart (PT chart) is a saturation lookup for propane (R290): it relates temperature and saturation pressure when liquid and vapor coexist in equilibrium. This is useful for thermodynamic interpretation, but it is not a universal “normal running pressure” diagnostic chart.
Pressure basis: absolute vs gauge
The table below uses absolute pressure (kPa(a), bar(a), psi(a)). Many gauges display gauge pressure (relative to ambient). Converting requires local atmospheric pressure:
Learn more: Gauge vs absolute pressure (psig vs psia).
Safety note
Propane (R290) is a flammable refrigerant. This page is educational and provides property reference data only — always follow applicable codes, OEM procedures, and local safety requirements.
R290 saturation pressure vs temperature (reference table)
Generated using CoolProp (the same property engine used by FluidTool) at Q=0 saturation. Values are rounded for readability.
| T (°C) | T (°F) | Psat (kPa(a)) | Psat (bar(a)) | Psat (psi(a)) |
|---|---|---|---|---|
| -20 | -4 | 244.5 | 2.445 | 35.5 |
| -10 | 14 | 345.3 | 3.453 | 50.1 |
| 0 | 32 | 474.5 | 4.745 | 68.8 |
| 10 | 50 | 636.6 | 6.366 | 92.3 |
| 20 | 68 | 836.5 | 8.365 | 121.3 |
| 30 | 86 | 1079.0 | 10.790 | 156.5 |
| 40 | 104 | 1369.4 | 13.694 | 198.6 |
| 50 | 122 | 1713.3 | 17.133 | 248.5 |
| 60 | 140 | 2116.8 | 21.168 | 307.0 |
| 70 | 158 | 2586.8 | 25.868 | 375.2 |
How to verify any row in FluidTool
- Open FluidTool with propane selected: /?fluid=n-Propane
- Choose a Two-phase input pair (Temperature & Quality / T + Q).
- Set Q=0 and enter the temperature from the table to read Psat.
Related
- Propane (R290) data sheet: identifiers and thermodynamic context.
- Refrigerant PT chart: what Tsat(P)/Psat(T) means and common pitfalls.
- Superheat & Subcooling: interpret measured line temperature vs saturation temperature.