Saturated Steam Properties (Steam Table by Pressure)
The saturated steam table at any pressure.
Example
You enter
- Steam pressure (psig; negative for vacuum) 100
- Atmospheric pressure (psia) 14.696
You get
- Sat temp f 337.88
- Spec vol ft3lb 3.8922
- Liquid enthalpy, hf 309.1 Btu/lb
- Latent heat, hfg 880.9 Btu/lb
- Steam enthalpy, hg 1,190.0 Btu/lb
Checked against published worked examples from: IAPWS.
Details, formula, and sources
ScopeBoiling temperature, the specific volume of the steam, the latent heat, and the enthalpy of the water and the steam. Steam at 100 psig boils at 337.9 F, takes 3.89 cu ft per pound and gives up 880.9 Btu per pound condensing. These are the figures the steam pipe, trap, flash and deaerator calculators ask for. Computed from the IAPWS-IF97 formulation behind modern steam tables, with a local atmosphere for altitude and negative gauge pressure for vacuum. Saturated conditions only, to 2,300 psia.
Formula or tableAbsolute pressure = gauge + atmosphere. Saturation temperature from IAPWS-IF97 Eq. 31. Saturated liquid volume and enthalpy (vf, hf) from the region 1 Gibbs equation, Eq. 7, and saturated vapor (vg, hg) from the region 2 Gibbs equation, Eq. 15, both evaluated at the saturation temperature and pressure: v = (R T / p) pi gamma_pi, h = R T tau gamma_tau, R = 0.461526 kJ/(kg K). hfg = hg - hf. Converted with 1 psi = 6,894.757 Pa, 1 Btu/lb = 2.326 kJ/kg, 1 cu ft/lb = 0.0624280 m3/kg.
Source and editionIAPWS R7-97(2012), Revised Release on the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam (International Association for the Properties of Water and Steam, Lucerne, 2007; editorial update 2012). The formulation behind the ASME steam tables since 1997.
Free accessFree at iapws.org/technical-guidance/release/IF97-Rev. The coefficients are its Tables 2, 10, 11 and 34. Its computer-program verification values (Tables 5, 15, 35 and 36: 18 values of volume, enthalpy, saturation pressure and saturation temperature) are reproduced to 9 significant digits by this implementation, and a unit test holds them.
What governsEstimate. AHJ and licensed professional govern.
API field namesgauge_pressure_psig, atmosphere_psia, sat_temp_f, spec_vol_ft3lb, hf_btulb, hfg_btulb, hg_btulb
- Saturated dry saturated steam and saturated water; no superheat, wetness or subcoolingscope of this tile
- Atmosphere 14.696 psia unless entered; valid 8 to 16 psiaentered
- Range 0.1 to 2,300 psia absoluteIAPWS-IF97 regions 1, 2 and 4
- Unit conversions exact definitions of the pound, foot and International Table BtuNIST SP 811