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ASME B31.4 Liquid Pipeline Hoop Stress

Calculate ASME B31.4 oil and liquid pipeline hoop stress for onshore and offshore pipelines.

Select the appropriate line pipe schedule (ASME or ISO etc) and stress table (API, ASM, DNV etc), and material. Hoop stress is calculated using Barlow's formula. For offshore pipelines either the pipe outside diameter or the mid wall diameter can be used to calculate hoop stress.

Reference : ANSI/ASME B31.4 : Pipeline Transportation Systems For Liquids And Slurries (2012)

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CALCULATOR : ASME B31.4 Section 402.3 Pipeline Hoop Stress (Onshore) [FREE]   ±

Calculate onshore pipeline hoop stress from operating pressure (ASME B31.4 section 402.3).

Select the line pipe schedule (ASME or ISO), and stress table (API, ASME or DNV), or use the user defined options. Pipeline hoop stress should be calculated for the maximum internal pressure along the pipeline or pipeline section (accounting for variations in elevation and fluid density).

Tool Input

  • schdtype : Line 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
  • plitype : Internal Pressure Type
    • Priu : User Defined Reference Internal Pressure
    • Pliu : User Defined Local Internal Pressure
    • ρf : Internal Fluid Density
    • Zr : Reference Elevation
    • Zl : Local Elevation
  • syutype : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • efactype : Weld Joint Quality Factor Type
    • Eu : User Defined Quality Factor
  • loctype : Location Class
    • Fu : User Defined Stress Factor
  • satype : Allowable Stress Type
    • Sau : User Defined Allowable Stress
  • walltype : Hoop Stress Wall Thickness Type
  • ta : Corrosion Allowance

Tool Output

  • D/tn : Pipe Diameter Over Wall Thickness Ratio
  • E : Weld Joint Factor
  • F : Design Stress Factor
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • Pli : Internal Fluid Pressure
  • SEF : Allowable Stress
  • SMYS : Yield Stress
  • Sh : Hoop Stress
  • Sh/SEF : Hoop Stress Ratio
  • t* : Wall Thickness For Hoop Stress Calculation
  • th : Pipe Pressure Containment Wall Thickness
  • tn : Pipe Nominal Wall Thickness

CALCULATOR : ASME B31.4 Section A402.3 Pipeline Hoop Stress (Offshore) [PLUS]   ±

Calculate offshore pipeline hoop stress from operating pressure (ASME B31.4 section A402.3).

Select the line pipe schedule (ASME or ISO), and stress table (API, ASME or DNV), or use the user defined options. Pipeline hoop stress should be calculated for the maximum pressure difference along the pipeline or pipeline section (accounting for variations in elevation and fluid density). For platform piping, external pressure can be ignored.

Tool Input

  • schdtype : Line 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
  • plitype : Internal Pressure Type
    • Priu : User Defined Reference Internal Pressure
    • Pliu : User Defined Local Internal Pressure
    • ρf : Internal Fluid Density
    • Zr : Reference Elevation
    • Zl : Local Elevation
  • pletype : External Pressure Type
    • Pleu : User Defined Local External Pressure
    • ρe : External Fluid Density
    • Zs : Surface Elevation
  • syutype : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • loctype : Location Class
    • Fu : User Defined Design Stress Factor
  • satype : Allowable Stress Type
    • Sau : User Defined Allowable Stress
  • calctype : Hoop Stress Calculation Type
  • walltype : Hoop Stress Wall Thickness Type
  • ta : Corrosion Allowance

Tool Output

  • ΔPl : Delta Pressure Across Pipe Wall
  • D/tn : Pipe Diameter Over Wall Thickness Ratio
  • F : Design Stress Factor
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • Ple : External Fluid Pressure
  • Pli : Internal Fluid Pressure
  • SF : Allowable Stress
  • SMYS : Yield Stress
  • Sh : Hoop Stress
  • Sh/SF : Hoop Stress Ratio
  • t* : Wall Thickness For Hoop Stress Calculation
  • th : Pipe Pressure Containment Wall Thickness
  • tn : Pipe Nominal Wall Thickness

CALCULATOR : ASME B31.4 Pipeline Diameter And Wall Thickness Schedule [FREE]   ±

Calculate ASME B31.4 oil pipeline diameter and pressure design wall thickness from pipe schedule or user defined diameter and wall thickness (ASME B31.4 section 403.2). For ASME B31.4 the pressure design thickness equals the nominal wall thickness minus the corrosion allowance (the fabrication tolerance is included in the design factor and is ignored).

Select the pipe schedule (NPS or ISO), 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 : ASME B31.4 Pipeline Hoop Stress From Operating Pressure (General) [FREE]   ±

Calculate ASME B31.4 general pipe hoop stress from operating pressure, diameter, wall thickness and design stress.

For ASME B31.4 pipe use either the Barlows equation outside diameter option, or the Barlows equation midwall diameter option. Wall thickness tolerance is not required (use the zero wall thickness tolerance option). The corrosion allowance should include mechanical allowance (eg threads), erosion allowance and any other allowances. External pressure should be ignored for onshore pipelines (use the no external pressure option).

Tool Input

  • pletype : External Pressure Type
    • Peu : User Defined External Pressure
  • 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
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • syutype : Stress Table Type
  • mattype : Yield Stress Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • sdtype : Design Stress Type (F x SMYS)
    • Fu : User Defined Design Factor
    • Sdu : User Defined Design Stress
  • walltype : Hoop Stress Calculation Type
    • Yu : User Defined ASME Y Factor
  • hooptype : Hoop Stress Wall Thickness Type
  • tc : Corrosion Allowance
  • Pi : Internal Pressure

Tool Output

  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • PΔ : Pressure Difference
  • Pe : External Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sd : Design Stress
  • Sh : Hoop Stress
  • Sh/Sd : Hoop Stress Over Design Stress Ratio
  • tf : Fabrication Allowance
  • tfx : Fabrication Fraction
  • th : Hoop Stress Thickness (Pressure Containment)
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness

CALCULATOR : ASME B31.4 Section 403.2 Pipeline Allowable Stress (Onshore) [FREE]   ±

Calculate allowable stress (SEF) for onshore pipelines (ASME B31.4 section 403.2).

The allowable stress equals the specified minimum yield stress (SMYS) times the weld quality factor (E) times the design stress factor (F). SEF = SMYS x E x F. Use the Result Table option to display the results for the selected stress table (API, ASME or DNV).

Tool Input

  • syutype : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • efactype : Weld Joint Quality Factor Type
    • Eu : User Defined Quality Factor
  • loctype : Location Class
    • Fu : User Defined Stress Factor

Tool Output

  • E : Weld Joint Factor
  • F : Design Stress Factor
  • SEF : Allowable Stress
  • SMYS : Specified Minimum Yield Stress
CALCULATOR : ASME B31.4 Section A402.3 Pipeline Allowable Stress (Offshore) [FREE]   ±

Calculate allowable stress (SF) for offshore pipelines (ASME B31.4 section A402.3).

The allowable stress equals the specified minimum yield stress (SMYS) times the design stress factor (F). SF = SMYS x F. Use the Result Table option to display the results for the selected stress table (API, ASME or DNV). For offshore pipelines, line pipe with a weld quality factor (E) = 1 should be used.

Tool Input

  • syutype : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • loctype : Location Class
    • Fu : User Defined Design Stress Factor

Tool Output

  • F : Design Stress Factor
  • SF : Allowable Stress
  • SMYS : Yield Stress
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