Superheated Steam Table — 180 bar (18 MPa)
Specific volume, internal energy, enthalpy, entropy, density and isobaric specific heat of superheated steam at 180 bar (18 MPa), computed from IAPWS-IF97 — the same formulation the SimuPipe solver uses. Rows run from the saturation temperature (356.99 °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) |
|---|---|---|---|---|---|---|
| 356.99Sat. | 7.5039e-3 | 133.2641 | 2375.1 | 2510.2 | 5.1066 | 21.8303 |
| 360 | 8.1081e-3 | 123.3335 | 2419.9 | 2565.9 | 5.1948 | 15.8604 |
| 380 | 0.010419 | 95.9796 | 2577.4 | 2764.9 | 5.5048 | 7.1712 |
| 400 | 0.011915 | 83.9302 | 2671.8 | 2886.3 | 5.6881 | 5.2645 |
| 420 | 0.013122 | 76.2082 | 2745.7 | 2981.9 | 5.8281 | 4.3826 |
| 440 | 0.014171 | 70.5688 | 2808.9 | 3064.0 | 5.9448 | 3.8649 |
| 460 | 0.015116 | 66.1530 | 2865.6 | 3137.7 | 6.0468 | 3.5262 |
| 480 | 0.015990 | 62.5386 | 2917.9 | 3205.7 | 6.1383 | 3.2902 |
| 500 | 0.016810 | 59.4877 | 2967.1 | 3269.7 | 6.2222 | 3.1190 |
| 520 | 0.017589 | 56.8538 | 3014.1 | 3330.7 | 6.3002 | 2.9911 |
| 540 | 0.018335 | 54.5406 | 3059.5 | 3389.5 | 6.3734 | 2.8935 |
| 560 | 0.019054 | 52.4814 | 3103.6 | 3446.6 | 6.4427 | 2.8179 |
| 580 | 0.019752 | 50.6285 | 3146.8 | 3502.4 | 6.5089 | 2.7585 |
| 600 | 0.020431 | 48.9461 | 3189.3 | 3557.0 | 6.5722 | 2.7114 |
| 620 | 0.021094 | 47.4073 | 3231.2 | 3610.9 | 6.6332 | 2.6739 |
| 640 | 0.021743 | 45.9908 | 3272.7 | 3664.0 | 6.6920 | 2.6440 |
| 660 | 0.022381 | 44.6798 | 3313.8 | 3716.7 | 6.7491 | 2.6200 |
| 680 | 0.023009 | 43.4609 | 3354.7 | 3768.9 | 6.8044 | 2.6010 |
| 700 | 0.023628 | 42.3228 | 3395.4 | 3820.7 | 6.8583 | 2.5859 |
| 720 | 0.024239 | 41.2563 | 3436.0 | 3872.3 | 6.9107 | 2.5743 |
| 740 | 0.024842 | 40.2538 | 3476.6 | 3923.7 | 6.9620 | 2.5655 |
| 760 | 0.025440 | 39.3086 | 3517.1 | 3975.0 | 7.0121 | 2.5591 |
| 780 | 0.026031 | 38.4152 | 3557.5 | 4026.1 | 7.0611 | 2.5549 |
| 800 | 0.026618 | 37.5688 | 3598.1 | 4077.2 | 7.1091 | 2.5525 |
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 180 bar (18 MPa) that pressure term is worth 479.1 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, at 356.99 °C. Below that temperature at 180 bar (18 MPa) the water is a liquid or a two-phase mixture, and this table does not apply — use the saturated tables instead.
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.