Pipeng Toolbox : Collapse Pressure Calculators Blank User
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Pipeline Collapse Pressure

Calculate subsea pipeline collapse pressure and buckle propagation pressure using either the DNV equations, BSI equations, or API equations.

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CALCULATOR : Pipeline External Collapse And Buckle Propagation [PLUS]   ±

Calculate pipeline external collapse pressure and buckle propagation pressure from wall thickness.

Collapse pressure is calculated using either the Murphy and Langner equation, the Timoshenko and Gere equation, or the API equation. Buckle propagation pressure is calculated using either the DNV equation, the BSI equation, or the API equation.

Tool Input

  • pletype : External Pressure Type
    • Pleu : User Defined Local External Pressure
  • syutype : Stress Table Type
  • mattype : Yield Stress Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • schdtype : Pipe Schedule Type
  • diamtype : Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • modptype : Pipe Material Type
    • νu : User Defined Pipe Poisson's Ratio
    • Eu : User Defined Pipe Elastic Modulus
  • fotype : Ovality Type
    • fapiu : User Defined API Ovality
    • fdnvu : User Defined DNV Ovality
  • presstype : Collapse or Buckle Pressure Calculation Type
  • ρe : External Fluid Density
  • Zl : Local Elevation
  • Zs : Surface Elevation

Tool Output

  • ν : Poisson's Ratio
  • E : Young's Modulus
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • Pc : Collapse Pressure
  • Pc/Ple : Collapse Pressure Over External Pressure Ratio (≥ 1)
  • Pel : Elastic Collapse Pressure
  • Ple : External Pressure
  • Py : Plastic Collapse Pressure
  • SMYS : Yield Stress
  • fapi : API Ovality Ratio
  • fdnv : DNV Ovality Ratio
  • tn : Pipe Nominal Wall Thickness
  • wd : Water Depth
CALCULATOR : Pipeline Local Pressure From Elevation (Offshore Pipeline) [FREE]   ±

Calculate offshore pipeline local stationary internal pressure and external pressure from elevation using Bernoulli's equation.

The local internal pressure is calculated from the reference pressure and relative elevation. The external pressure is calculated from the water depth. The 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 : Pipeline Yield Stress And Tensile Stress [FREE]   ±

Calculate pipeline SMYS, SMTS, SMTS over SMYS ratio and SMYS over SMTS ratio from pipe stress tables.

Select one of the API, ASME or DNV stress table options. The API stress values are taken from API 5L tables 6 and 7 (note the API 5L X series is superseded). The ASME stress values are taken from ASME B31.3 process piping table A-1M. The DNV stress values are taken from DNVGL ST F101 submarine pipelines, tables 7-5 and 7-11.

Use the Result Table option to display the stress values for the selected stress table (click the Result Table button, and then click the make table button).

Tool Input

  • syutype : Stress Table Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress

Tool Output

  • SMTS : Specified Minimum Tensile Stress
  • SMTS/SMYS : Tensile Stress Over Yield Stress Ratio
  • SMYS : Specified Minimum Yield Stress
  • SMYS/SMTS : Yield Stress Over Tensile Stress Ratio
CALCULATOR : Pipeline Diameter And Wall Thickness Schedule [FREE]   ±

Calculate pipeline diameter, pressure design wall thickness (nominal wall thickness minus corrosion allowance) from nominal wall thickness.

For ASME B31.4 (oil pipelines), ASME B31.8 (gas pipelines) and AS 2885 (oil and gas pipelines) the fabrication allowance is accounted for in the design factor. Fabrication allowance is not included when calculating the pressure design thickness.

Select the pipe schedule (NPS or ISO etc), pipe diameter and wall thickness, or use the user defined option. Use the Result Table option to display the pipe schedule with nominal wall thickness and pressure design wall thickness for the selected diameter.

Tool Input

  • schdtype : Line Pipe Schedule Type
  • diamtype : Line Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • c : Wall Thickness Corrosion Allowance

Tool Output

  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness
CALCULATOR : Pipeline Maximum And Minimum Diameter From Tolerance [FREE]   ±

Calculate pipeline maximum and minimum diameter from diameter tolerance.

Select the pipe schedule type, diameter, wall thickness and diameter tolerance, or use the user defined option. Use the Result Table option to display a table of the diameter and diameter tolerance versus either wall thickness, diameter tolerance type, or diameter.

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
  • dtoltype : Diameter Fabrication Tolerance Type
    • dxu : User Defined Diameter Fraction
    • dfu : User Defined Diameter Allowance
  • ddtype : Diameter Type

Tool Output

  • ID : Nominal Inside Diameter
  • ID* : Inside Diameter With Tolerance
  • OD : Nominal Outside Diameter
  • OD* : Outside Diameter With Tolerance
  • OD*/tn : Diameter Over Wall Thickness Ratio
  • df : Diameter Fabrication Allowance
  • dx : Diameter Fabrication Fraction
  • tn : Nominal Wall Thickness
CALCULATOR : Pipeline Material Property [FREE]   ±

Calculate typical line pipe elastic modulus, shear modulus, bulk modulus, density, and thermal expansion coefficient.

The table values of Poisson ratio and bulk modulus are calculated from the elastic modulus and shear modulus. Project specific data should be used if it is available. Use the Result Table option to display a table of properties versus material type.

Tool Input

  • modptype : Material Type
    • Eu : User Defined Elastic Modulus
    • Gu : User Defined Shear Modulus
    • Ku : User Defined Bulk Modulus
    • νu : User Defined Poisson Ratio
    • ρu : User Defined Density
    • αu : User Defined Thermal Expansion Coefficient

Tool Output

  • α : Thermal Expansion Coefficient
  • ν : Poisson Ratio
  • ρ : Density
  • E : Elastic Modulus
  • G : Shear Modulus
  • K : Bulk Modulus
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