R717 (Ammonia) pressure temperature chart (PT)
An R717 pressure temperature chart (PT chart) is a saturation lookup for ammonia (R717): 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
Ammonia is associated with specific safety requirements (toxicity, compatibility, and system design practices). This page is educational and provides property reference data only — always follow applicable codes, OEM guidance, and local safety requirements.
R717 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 | 190.0 | 1.900 | 27.6 |
| -10 | 14 | 290.6 | 2.906 | 42.2 |
| 0 | 32 | 429.2 | 4.292 | 62.3 |
| 10 | 50 | 614.8 | 6.148 | 89.2 |
| 20 | 68 | 857.0 | 8.570 | 124.3 |
| 30 | 86 | 1166.5 | 11.665 | 169.2 |
| 40 | 104 | 1554.5 | 15.545 | 225.5 |
| 50 | 122 | 2033.0 | 20.330 | 294.9 |
| 60 | 140 | 2614.5 | 26.145 | 379.2 |
| 70 | 158 | 3312.5 | 33.125 | 480.4 |
How to verify any row in FluidTool
- Open FluidTool with ammonia selected: /?fluid=Ammonia
- Choose a Two-phase input pair (Temperature & Quality / T + Q).
- Set Q=0 and enter the temperature from the table to read Psat.
Related
- Ammonia (R717) 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.