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ASME B31.4 Liquid Pipeline Hydrotest Pressure

Calculate ASME B31.4 oil and liquid pipeline test pressure and hoop stress check 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. The test pressure and hoop stress should be checked for all elevations. Use the Result Plot option to plot the required test pressure versus elevation, or hoop stress verus elevation for user defined test pressure.

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

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CALCULATOR : ASME B31.4 Section 437.4 Pipeline Test Pressure And Hoop Stress Check (Onshore) [PLUS]   ±

Calculate onshore pipeline test pressure and wall stress check from operating pressure (ASME B31.4 section 437.4). Pipeline pressure should account 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
  • walltype : Hoop Stress Wall Thickness Type
  • 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
  • satype : Allowable Stress Type
    • Fu : User Defined Design Stress Factor
    • Sau : User Defined Allowable Stress
  • tfactype : Test Pressure Factor Type
    • Tu : User Defined Test Pressure Factor
  • loctype : Location Class
    • Pltu : User Defined Local Test Pressure
    • Pttu : User Defined Test Point Test Pressure
    • Zt : Test Point Elevation
    • ρt : Test Fluid Density
  • ta : Corrosion Allowance

Tool Output

  • D/tn : Pipe Diameter Over Wall Thickness Ratio
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • Pli : Internal Fluid Pressure
  • Plt : Local Test Pressure
  • Plt/Pli : Local Test Pressure Over Operating Pressure Ratio
  • Pltmin : Minimum Required Local Test Pressure
  • Ptt : Test Point Test Pressure
  • SEF : Allowable Stress
  • SMYS : Yield Stress
  • Sh : Hoop Stress
  • Sh/SEF : Hoop Stress Ratio
  • T : Test Pressure Factor
  • t* : Wall Thickness For Hoop Stress Calculation
  • th : Pipe Pressure Containment Wall Thickness
  • tn : Pipe Nominal Wall Thickness

CALCULATOR : ASME B31.4 Section 437.4 Pipeline Test Pressure And Hoop Stress Check (Offshore) [PLUS]   ±

Calculate offshore pipeline test pressure and wall stress check from operating pressure (ASME B31.4 section 437.4). Pipeline pressure should account for variations in elevation and fluid density. For subsea pipelines external pressure should also be accounted for.

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
  • tfactype : Test Pressure Factor Type
    • Tu : User Defined Test Pressure Factor
  • loctype : Location Class
    • Pltu : User Defined Local Test Pressure
    • Pttu : User Defined Test Point Test Pressure
    • Zt : Test Point Elevation
    • ρt : Test Fluid Density
  • satype : Allowable Stress Type
    • Fu : User Defined Design Stress Factor
    • Sau : User Defined Allowable Stress
  • calctype : Hoop Stress Type
  • walltype : Hoop Stress Wall Thickness Type
  • ta : Corrosion Allowance

Tool Output

  • ΔPl : Delta Test Pressure Across Pipe Wall
  • D/tn : Pipe Diameter Over Wall Thickness Ratio
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • Ple : External Fluid Pressure
  • Pli : Internal Fluid Pressure
  • Plt : Local Test Pressure
  • Pltmin : Minimum Required Local Test Pressure
  • Pt/Pli : Local Test Pressure Over Operating Pressure Ratio
  • Ptt : Test Point Test Pressure
  • SF : Allowable Stress
  • SMYS : Yield Stress
  • Sh : Hoop Stress
  • Sh/SF : Hoop Stress Ratio
  • T : Test Pressure Factor
  • t* : Wall Thickness For Hoop Stress Calculation
  • th : Pipe Pressure Containment Wall Thickness
  • tn : Pipe Nominal Wall Thickness

CALCULATOR : ASME B31.4 Pipeline Hydrotest Liquid Volume And Dose Rate [FREE]   ±

Calculate ASME B31.4 water volume and liquid chemical dose rate for water hydrotest.

The dose rate can be calculated from the dose volume fraction, the dose mass fraction, the dose volume ratio, or the dose mass ratio. The average fluid density includes the dose chemical. The calculated volume does not include the effect of fluid compression or pipe expansion due to the test pressure.

Tool Input

  • 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
  • dosetype : Dosage Type
    • Xvu : User Defined Dose Volume Fraction
    • Xmu : User Defined Dose Mass Fraction
    • Rvu : User Defined 200
    • Rmu : User Defined 250
  • voltype : Fluid Volume Type
    • Vlu : User Defined Liquid Volume
    • Mlu : User Defined Liquid Mass
    • Vfu : User Defined Total Fluid Volume
    • Mfu : User Defined Total Fluid Mass
    • Lu : User Defined Pipeline Length
  • ρl : Liquid Density
  • ρd : Dose Chemical Density

Tool Output

  • ρf : Fluid Average Density
  • ID : Inside Diameter
  • L : Pipe Length
  • Md : Dose Mass
  • Mf : Total Fluid Mass
  • Ml : Liquid Mass
  • Rm : Dose Mass Ratio
  • Rv : Dose Volume Ratio
  • Vd : Dose Volume
  • Vf : Total Fluid Volume
  • Vl : Liquid Volume
  • Xm : Dose Mass Fraction
  • Xv : Dose Volume Fraction
CALCULATOR : ASME B31.4 Pipeline Leak Test Gas Volume And Dose Rate [FREE]   ±

Calculate ASME B31.4 gas volume and liquid chemical dose rate for gas leak test.

The dose rate can be calculated from dose volume fraction, dose mass fraction or dose gas ratio. The average fluid density includes the dose chemical. The calculated volume does not include the effect of pipe expansion due to the test pressure.

Tool Input

  • 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
  • dosetype : Dose Rate Type
    • Xvu : User Defined Dose Volume Fraction
    • Xmu : User Defined Dose Mass Fraction
    • Rvu : User Defined Dose Volume Over Gas Moles Ratio
    • Rmu : User Defined Dose Mass Over Gas Moles Ratio
  • voltype : Fluid Volume Type
    • Vgu : User Defined Gas Volume
    • Mgu : User Defined Gas Mass
    • Ngu : User Defined Gas Moles
    • Vfu : User Defined Total Fluid Volume
    • Mfu : User Defined Total Fluid Mass
    • Lu : User Defined Pipeline Length
  • ρd : Dose Chemical Density
  • P : Fluid Pressure
  • T : Fluid Temperature
  • Z : Gas Compressibility Factor
  • SG : Gas Specific Gravity

Tool Output

  • ρf : Fluid Average Density
  • ρg : Gas Density (At T P)
  • ID : Inside Diameter
  • L : Pipe Length
  • Md : Dose Mass
  • Mf : Total Fluid Mass
  • Mg : Gas Mass
  • Ng : Gas Moles
  • Rm : Dose Mass Over Gas Moles Ratio
  • Rv : Dose Volume Over Gas Moles Ratio
  • Vd : Dose Volume
  • Vf : Total Fluid Volume
  • Vg : Gas Volume
  • Xm : Dose Mass Fraction
  • Xv : Dose Volume Fraction
  • vg : Gas Mole Volume (At T P)
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 Test Pressure And Hoop Stress Check (General) [FREE]   ±

Calculate ASME B31.4 general pipe test pressure and hoop stress check from 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
  • 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
  • schdtype : Pipe Schedule Type
  • diamtype : Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • sdtype : Design Stress Type (F x SMYS)
    • Fu : User Defined Design Factor
    • Sdu : User Defined Design Stress
  • walltype : Hoop Stress Wall Thickness Type
    • Yu : User Defined ASME Y Factor
  • hooptype : Hoop Stress Wall Thickness Type
  • testtype : Test Pressure Type
    • Tu : User Defined Test Factor
    • Ptu : User Defined Test Pressure
  • tc : Corrosion Allowance
  • Pi : Operating Pressure

Tool Output

  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • Pe : External Pressure
  • Pt : Test Pressure
  • PtΔ : Test Pressure Difference
  • SMYS : Specified Minimum Yield Stress
  • Sd : Design Stress
  • Sh : Hoop Stress
  • Sh/SMYS : Hoop Stress Over Yield Stress Ratio
  • T : Test Pressure Factor
  • 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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