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API 520 Fluid Property

Calculate API 520 gas and steam properties.

Properties include density, specific heat constant pressure, specific heat constant volume, specific heat ratio, molar mass, gas constant, gas specific gravity, and gas compressibility factor. The gas compressibility factor is calculated from the critical point temperature, critical point temperature, and the accentric factor using either the Peng Robinson, Soave, Redlich Kwong or Van Der Waals equations of state (EOS).Steam properties are calculated from IAPWS R7-97, industrial properties of steam.

Gas specific gravity at standard conditions is approximately equal to the gas molar mass divided by the molar mass of dry air. The molar mass of dry air is taken as 28.964 kg/kg-mole.

Reference : API 520 Sizing, Selection And Installation Of Pressure Relieving Devices (2014)

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CALCULATOR : API 520 Section 5.6 Gas Properties [FREE]   ±

Calculate API 520 gas properties: specific heat constant pressure, specific heat constant volume, specific heat ratio, molar mass, gas constant, and gas specific gravity.

Use the Result Table option to display the results for all gas types.

Tool Input

  • fluidtype : Fluid Type
    • Cpu : User Defined Specific Heat Constant Pressure
    • Cvu : User Defined Specific Heat Constant Volume
    • γu : User Defined Specific Heat Ratio
    • SGu : User Defined Specific Gravity
    • Pcu : User Defined Critical Point Pressure
    • Tcu : User Defined Critical Point Temperature
    • ωu : User Defined Accentric Factor

Tool Output

  • γ : Specific Heat Ratio
  • ω : Accentric Factor
  • Cp : Fluid Heat Capacity Constant Pressure
  • Cv : Fluid Heat Capacity Constant Volume
  • Pc : Critical Point Pressure
  • R : Gas Constant
  • SG : Gas Specific Gravity Relative To Air
  • Tc : Critical Point Temperature
  • mm : Fluid Molar Mass
CALCULATOR : API 520 Section 5.6 Gas Density And Compressibility Factor [FREE]   ±

Calculate API 520 gas compressibility factor and density from gas temperature and pressure for selected gases.

The gas compressibility factor is calculated from the critical point temperature, critical point temperature, and the accentric factor using either the Peng Robinson, Soave, Redlich Kwong or Van Der Waals equations of state (EOS). The compressibility factor calculation is valid for gas phase only. Use the Result Plot option to plot compressibility factor versus pressure and temperature, compressibility factor versus pressure and equation of state type, or compressibility factor versus temperature and equation of state type.

Tool Input

  • fluidtype : Fluid Type
    • SGu : User Defined Gas Specific Gravity
    • ωu : User Defined Acentric Factor
    • Pcu : User Defined Critical Pressure
    • Tcu : User Defined Critical Temperature
  • eostype : Equation Of State
    • Zu : User Defined Compressibility Factor
  • P : Fluid Pressure
  • T : Fluid Temperature

Tool Output

  • ρ : Fluid Density
  • ω : Accentric Factor
  • Pc : Critical Point Pressure
  • Pr : Reduced Pressure
  • SG : Gas Specific Gravity Relative To Air
  • Tc : Critical Point Temperature
  • Tr : Reduced Temperature
  • Vm : Molar Volume
  • Z : Compressibility Factor
  • cvg : Convergence Check
  • mw : Fluid Molar Mass
CALCULATOR : API 520 Steam Table [FREE]   ±

Calculate API 520 steam and water properties from temperature and pressure.

The steam properties are calculated from IAPWS R7-97, industrial properties of steam.

Tool Input

  • anomtype : Region 2/3 Anomaly Type
  • proptype : Steam Phase
    • Pu : User Defined Pressure
    • Tu : User Defined Temperature
    • Xu : User Defined Saturated Steam Quality

Tool Output

  • ρ : Density
  • Cp : Specific Heat Constant Pressure
  • Cp-Cv : Delta Specific Heat (Cp - Cv)
  • Cp/Cv : Specific Heat Ratio
  • Cv : Specific Heat Constant Volume
  • P : Pressure
  • T : Temperature
  • Vc : Speed Of Sound
  • Z : Compressibility Factor
  • cvg : Convergence Check
  • h : Enthalpy
  • s : Entropy
  • u : Internal Energy
  • vg : Mole Specific Volume
  • vm : Specific Volume
  • wv : Specific Weight
CALCULATOR : API 520 Gas Specific Gravity Mole Volume And Molar Mass [FREE]   ±

Calculate API 520 gas specific gravity from molar mass.

Gas specific gravity at standard conditions is approximately equal to the gas molar mass divided by the molar mass of dry air. For most gases the compressibility factor Z is approximately equal to 1 at standard conditions. The molar mass of dry air is taken as 28.964 kg/kg-mole.

The gas specific gravity can also be calculated from gas density, temperature, pressure and compressibility factor. If the gas density is measured at standard conditions the compressibility factor can be set to 1.

Tool Input

  • fluidtype : Gas Type
    • SGu : User Defined Gas Specific Gravity
  • Z : Gas Compressibility Factor
  • P : Gas Pressure
  • T : Gas Temperature

Tool Output

  • ρ : Gas Density
  • M : Gas Molar Mass
  • R : Gas Constant
  • SG : Gas Specific Gravity
  • vg : Gas Molar Volume (At T P)
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