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Compressible Flow Area And Internal Diameter

Calculate compressible flow cross section area and diameter.

Pipe inside diameter and internal cross section area are calculated from the pipe diameter and wall thickness. Use the Result Table option to display a table of the inside diameter and cross section area versus either outside diameter or wall thickness.

Effective nozzle orifice diameter and cross section area for pressure relief valves is calculated from API letter designation (API 526 type D to T). The combination of valve and nozzle must be tested with the operating fluid, and certified as having a flow rate greater than or equal to the calculated flow rate for the effective size. Use the Result Table option to display the effective diameter and cross section area versus API letter designation.

Reference : Fluid Mechanics, Frank M White, McGraw Hill

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CALCULATOR : Compressible Flow Gas Density And Compressibility Factor [FREE]   ±

Calculate gas compressibility factor and density from gas temperature and pressure for common gases: argon Ar, n-decane C10H22, ethylene C2H4, ethyl chloride C2H5Cl, ethane C2H6, propene C3H6, propane C3H8, iso-butane C4H10, n-butane C4H10, iso-pentane C5H12, n-pentane C5H12, n-hexane C6H14, n-heptane C7H16, n-octane C8H18, n-nonane C9H20, methyl chloride CH3Cl, methane CH4, chlorine Cl2, carbon monoxide CO, carbon dioxide CO2, hydrogen H2, steam H2O, hydrogen sulphide H2S, hydrogen chloride HCl, helium He, krypton Kr, nitrogen N2, air N2+O2, ammonia NH3, oxygen O2, sulphur dioxide SO2, xenon Xe.

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

Tool Output

  • ρ : Fluid Density
  • ω : Accentric Factor
  • Pc : Critical Point Pressure
  • Rg : Specific Gas Constant
  • SG : Gas Specific Gravity
  • Tc : Critical Point Temperature
  • Vm : Molar Volume
  • Z : Compressibility Factor
  • cvg : Convergence Check
  • mmg : Gas Molar Mass

CALCULATOR : Compressible Flow Pipe Inside Diameter And Internal Cross Section Area [FREE]   ±

Calculate pipe inside diameter and internal cross section area for a circular pipe or duct.

The pipe inside diameter and cross section area are calculated from the pipe schedule diameter and wall thickness. Use the Result Table option to display a table of the inside diameter and cross section area versus either outside diameter or wall thickness.

Tool Input

  • schdtype : Schedule Type
  • diamtype : Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness

Tool Output

  • AX : Pipe Inside Cross Section Area
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tn : Nominal Wall Thickness

CALCULATOR : Compressible Flow Nozzle Orifice Diameter And Cross Section Area [FREE]   ±

Calculate effective nozzle orifice diameter and cross section area from API letter designation (API 526 type D to T).

Pressure relief valve calculations are based on frictionless flow, however there are significant friction losses incurred in a pressure relief valve. API effective orifice sizing is used to compensate for the pressure losses in relief valves (the actual nozzle area is greater than the effective nozzle area). The combination of valve and nozzle must be tested with the operating fluid, and certified as having a flow rate greater than or equal to the calculated flow rate for the effective size. The API 526 flow rate is calculated for isentropic flow.

Use the Result Table option to display a table of effective area and effective diameter versus nozzle API letter designation (D to T).

Tool Input

  • antype : Nozzle Orifice Type
    • Dnu : User Defined Nozzle Diameter
    • Anu : User Defined Nozzle Area

Tool Output

  • An : Nozzle Effective Area
  • Dn : Nozzle Effective Diameter