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ASME B31.1 Power Piping Hydrotest Pressure

Calculate ASME B31.1 power piping hydrotest pressure and pneumatic leak test pressure for steel pipe and plastic piping.

The test pressure should be ≥ 1.5 times the design pressure for hydrotest, and ≥ 1.2 times the design pressure for pneumatic tests. The hoop stress during testing should be ≤ 90% of the yield stress. Hoop stress can be calculated for either the minimum wall thickness (nominal wall thickness minus fabrication allowance), or the pressure design wall thickness (minimum wall thickness minus the corrosion allowance).

For piping systems with combined internal and external pressure the test pressure should be calculated from the internal pressure. The hoop stress is calculated from the pressure difference during testing. Use the workbook ASME B31.1 data tables to look up allowable stress data.

Reference : ANSI/ASME B31.1 : Power Piping (2014)

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CALCULATOR : ASME B31.1 Section 137.4 Pipe Test Pressure And Hoop Stress Check (Metal Pipe) [FREE]   ±

Calculate test pressure and hoop stress for low pressure steel pipe (ASME B31.1 section 137.4).

For hydrotest the test factor should be >= 1.5. For pneumatic test the test factor should be ≥ 1.2 and ≤ 1.5. The hoop stress should not exceed 90% of the yield stress at the test temperature.

Tool Input

  • schdtype : Line Pipe Schedule Type
  • diamtype : Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • ttoltype : Wall Thickness Fabrication Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • yfactype : Y Factor Type
    • Yu : User Defined Y Coefficient
  • walltype : Hoop Stress Wall Thickness Type
  • testtype : Test Pressure Type
    • Tu : User Defined Test Pressure Factor
    • Ptu : User Defined Test Pressure
  • A : Corrosion Allowance
  • T : Design Temperature
  • P : Design Pressure
  • Sy : Yield Stress At Test Temperature

Tool Output

  • D : Pipe Outside Diameter
  • D/tn : Diameter Over Wall Thickness Ratio
  • Pt : Test Pressure
  • Pt/P : Test Pressure Over Design Pressure Ratio
  • Py : Yield Pressure
  • Sh : Hoop Stress [ Pa ]
  • Sh/Sy : Hoop Stress Over Yield Stress Ratio (≤ 0.9)
  • Y : Y Factor
  • d : Pipe Inside Diameter
  • t : Pressure Containment Wall Thickness
  • t* : Wall Thickness For Hoop Stress Calculation
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness

CALCULATOR : ASME B31.1 Section N137 Pipe Test Pressure And Hoop Stress Check (Plastic Pipe) [FREE]   ±

Calculate test pressure and hoop stress for low pressure plastic pipe (ASME B31.1 section N137).

For hydrotest the test factor should be >= 1.5. For the pneumatic test the test factor should be >= 1.2 and <= 1.5. A pneumatic test is not allowed without the owners approval. The hoop stress should not exceed the hydrostatic design basis stress at the test temperature.

Tool Input

  • schdtype : Pipe Schedule Type
  • diamtype : Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
    • DRu : User Defined Dimension Ratio SDR OR SIDR
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • walltype : Hoop Stress Wall Thickness Type
  • testtype : Test Pressure Type
    • Tu : User Defined Test Pressure Factor
    • Ptu : User Defined Test Pressure
  • c : Mechanical Allowance
  • P : Design Pressure
  • Sb : Hydrostatic Design Basis Stress At Test Temperature

Tool Output

  • CVG : Convergence Factor
  • D : Pipe Outside Diameter
  • DR : Dimension Ratio (SDR or SIDR)
  • Pt : Test Pressure
  • Pt/P : Test Pressure Over Design Pressure Ratio
  • Py : Yield Pressure
  • Sh : Hoop Stress [ Pa ]
  • Sh/Sy : Hoop Stress Over Yield Stress Ratio (≤ 1)
  • d : Pipe Inside Diameter
  • t : Pressure Containment Wall Thickness
  • t* : Wall Thickness For Hoop Stress Calculation
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness

CALCULATOR : ASME B31.1 Pipe Hydrotest Liquid Volume And Dose Rate [FREE]   ±

Calculate ASME B31.1 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 B31.1 Pipe Leak Test Gas Volume And Dose Rate [FREE]   ±

Calculate ASME B31.1 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 B31.1 Metal Pipe Diameter And Wall Thickness Schedule [FREE]   ±

Calculate ASME B31.1 metal pipe diameter, minimum wall thickness and pressure design thickness from pipe schedule or user defined diameter and wall thickness (ASME B31.1 section 104.1).

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, minimum wall thickness and pressure design wall thickness for the selected 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
  • ttoltype : Wall Thickness Fabrication Tolerance Type
    • txu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • c : Wall Thickness Corrosion Allowance

Tool Output

  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness
  • tx : Wall Thickness Fabrication Fraction
CALCULATOR : ASME B31.1 Plastic Pipe Diameter And Wall Thickness Schedule [FREE]   ±

Calculate ASME B31.1 plastic pipe diameter, minimum wall thickness and pressure design thickness from pipe schedule wall thickness or dimension ratio (SDR or SIDR) (ASME B31.1 section 104.1).

Select the pipe schedule (NPS or ISO), pipe diameter and wall thickness or dimension ratio, or use the user defined options. Use the Result Table option to display the pipe schedule with nominal wall thickness, minimum wall thickness and pressure design wall thickness for the selected diameter. The dimension ratio is calculated from the pressure design thickness (nominal thickness minus mechcanical allowance and fabrication allowance).

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
    • DRu : User Defined Dimension Ratio SDR OR SIDR
  • ttoltype : Wall Thickness Fabrication Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • c : Wall Thickness Mechanical Allowance

Tool Output

  • CVG : Convergence Factor
  • DR : Pipe Dimension Ratio (SDR Or SIDR)
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness
CALCULATOR : ASME B31.1 Pipe Test Pressure And Hoop Stress Check (General) [FREE]   ±

Calculate ASME B31.1 general pipe test pressure and hoop stress check from diameter, wall thickness, wall thickness tolerance and design stress.

For ASME B31.1 pipe use the Barlows equation with ASME Y factor option. Wall thickness tolerance can be defined by either a fraction tolerance, or an allowance tolerance. All tolerances should be positive. The corrosion allowance should include mechanical allowance (eg threads), erosion allowance and any other allowances. External pressure should be ignored (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

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