Superheated Steam Table — 250 bar (25 MPa)
Specific volume, internal energy, enthalpy, entropy, density and isobaric specific heat of superheated steam at 250 bar (25 MPa), computed from IAPWS-IF97 — the same formulation the SimuPipe solver uses. Rows run from 400 °C to 800 °C in 20 °C steps.
| T (°C) | v (m³/kg) | ρ (kg/m³) | u (kJ/kg) | h (kJ/kg) | s (kJ/kg·K) | cp (kJ/kg·K) |
|---|---|---|---|---|---|---|
| 400 | 6.0053e-3 | 166.5190 | 2428.5 | 2578.6 | 5.1399 | 13.0392 |
| 420 | 7.5793e-3 | 131.9376 | 2580.0 | 2769.4 | 5.4196 | 7.4062 |
| 440 | 8.6975e-3 | 114.9758 | 2679.6 | 2897.1 | 5.6013 | 5.6026 |
| 460 | 9.6166e-3 | 103.9872 | 2758.8 | 2999.2 | 5.7426 | 4.6938 |
| 480 | 0.010418 | 95.9836 | 2826.6 | 3087.1 | 5.8609 | 4.1377 |
| 500 | 0.011142 | 89.7503 | 2887.4 | 3165.9 | 5.9642 | 3.7661 |
| 520 | 0.011810 | 84.6768 | 2943.2 | 3238.5 | 6.0569 | 3.5044 |
| 540 | 0.012435 | 80.4170 | 2995.7 | 3306.6 | 6.1416 | 3.3126 |
| 560 | 0.013028 | 76.7576 | 3045.6 | 3371.3 | 6.2203 | 3.1679 |
| 580 | 0.013595 | 73.5585 | 3093.6 | 3433.5 | 6.2941 | 3.0560 |
| 600 | 0.014140 | 70.7229 | 3140.2 | 3493.7 | 6.3638 | 2.9679 |
| 620 | 0.014667 | 68.1811 | 3185.6 | 3552.3 | 6.4302 | 2.8976 |
| 640 | 0.015179 | 65.8816 | 3230.2 | 3609.7 | 6.4937 | 2.8410 |
| 660 | 0.015678 | 63.7849 | 3274.1 | 3666.0 | 6.5548 | 2.7949 |
| 680 | 0.016165 | 61.8605 | 3317.4 | 3721.5 | 6.6136 | 2.7574 |
| 700 | 0.016643 | 60.0841 | 3360.3 | 3776.4 | 6.6706 | 2.7267 |
| 720 | 0.017113 | 58.4361 | 3402.8 | 3830.6 | 6.7258 | 2.7016 |
| 740 | 0.017575 | 56.9006 | 3445.1 | 3884.5 | 6.7794 | 2.6812 |
| 760 | 0.018030 | 55.4643 | 3487.2 | 3937.9 | 6.8317 | 2.6647 |
| 780 | 0.018479 | 54.1164 | 3529.1 | 3991.1 | 6.8826 | 2.6517 |
| 800 | 0.018922 | 52.8474 | 3570.9 | 4044.0 | 6.9324 | 2.6415 |
u is not tabulated independently. Specific internal energy follows from the enthalpy and specific volume as u = h − p·v, with p in MPa and v in m³/kg (1 MPa·m³/kg = 1000 kJ/kg). At 250 bar (25 MPa) that pressure term is worth 473.1 kJ/kg at 800 °C, so u and h are far apart at high pressure and nearly equal at low pressure — a common source of error when the wrong column is read.
The first row is saturated vapour on subcritical pages; this page has none, because there is no saturation line above the critical pressure.
Values are IAPWS-IF97, not interpolated. Every row is evaluated directly from the industrial formulation at that exact temperature, so there is no interpolation error between rows. If you need a temperature between the 20 °C steps, the calculator computes it exactly.