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API RP 1111 Pipeline Local Pressure

Calculate API RP 1111 limit state pipeline local stationary internal and external pressure from elevation.

Elevation is measured relative to any arbitrary datum (+ve above the datum -ve below the datum). The external pressure is calculated from the water depth. The internal fluid density is assumed constant. Use the Result Plot option to plot pressure versus elevation.

Reference : API RP 1111 : Design, Construction, Operation, and Maintenance of Offshore Hydrocarbon Pipelines (Limit State Design) (2011)

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CALCULATOR : API RP 1111 Section 4.2 Pipeline Local Pressure From Elevation [FREE]   ±

Calculate pipeline local stationary internal and external pressure from elevation (API RP 1111 section 4.2). Internal fluid density is assumed constant.

Tool Input

  • pletype : External Pressure Type
    • Pleu : User Defined Local External Pressure
  • plitype : Internal Pressure Type
    • Priu : User Defined Reference Internal Pressure
    • Pliu : User Defined Local Internal Pressure
  • ρf : Internal Fluid Density
  • ρe : External Fluid Density
  • Zr : Reference Elevation Relative To Datum
  • Zl : Local Elevation Relative To Datum
  • Zs : Surface Elevation Relative To Datum

Tool Output

  • ΔPl : Pressure Difference Across Pipe Wall
  • Δz : Local Elevation Relative To Reference Elevation
  • Ple : External Pressure
  • Pli : Internal Pressure At Local Elevation
  • Pri : Internal Pressure At Reference Elevation
  • wd : Water Depth

CALCULATOR : API RP 1111 Section 4.2 Three Phase Fluid Density [FREE]   ±

Calculate pipeline fluid density for three phase gas oil water or black oil (API RP 1111 section 4.2).

Select either single phase oil, single phase water, two phase liquid (oil and water), single phase gas, or three phase gas, oil and water. Gas oil ratio (GOR) is measured relative to the oil volume at standard conditions (water volume is ignored). Water cut is the volume ratio of water in the liquid phase (water and oil - gas volume is ignored).

Tool Input

  • mvtype : Fluid Density Type
    • GORu : User Defined Gas Oil Ratio
    • WCu : User Defined Water Cut
    • ρu : User Defined Fluid Density
  • ρo : Oil Density
  • ρw : Water Density
  • P : Fluid Pressure
  • T : Fluid Temperature
  • Z : Gas Compressibility Factor
  • SG : Gas Specific Gravity

Tool Output

  • ρf : Average Fluid Density
  • ρg : Gas Density
  • ρl : Liquid Density
  • GOR : Gas Oil Ratio
  • WC : Water Cut
  • Xmg : Gas Mass Fraction
  • Xml : Liquid Mass Fraction
  • Xmo : Oil Mass Fraction
  • Xmw : Water Mass Fraction
  • Xvg : Gas Volume Fraction
  • Xvl : Liquid Volume Fraction
  • Xvo : Oil Volume Fraction
  • Xvw : Water Volume Fraction
  • vg : Gas Mole Volume (At T P)
CALCULATOR : API RP 1111 Section 4.2 Two Phase Fluid Density [FREE]   ±

Calculate pipeline fluid density for for two phase gas liquid (API RP 1111 section 4.2).

Select either single phase gas, single phase liquid, or two phase gas liquid. Gas oil ratio (GOR) is measured relative to the oil volume at standard conditions.

Tool Input

  • mvtype : Fluid Density Type
    • GORu : User Defined Gas Oil Ratio
    • Xmu : User Defined Gas Mass Fraction
    • Xvu : User Defined Gas Volume Fraction
    • ρu : User Defined Fluid Density
  • ρl : Liquid Density
  • P : Fluid Pressure
  • T : Fluid Temperature
  • Z : Gas Compressibility Factor
  • SG : Gas Specific Gravity

Tool Output

  • ρf : Average Fluid Density
  • ρg : Gas Density (At T P)
  • GOR : Gas Oil Ratio
  • Xm : Gas Mass Fraction
  • Xv : Gas Volume Fraction (At T P)
  • vg : Gas Mole Volume (At T P)
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