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ASME B31.1 Power Piping Hoop Stress

Calculate ASME B31.1 power piping hoop stress for metal and plastic piping.

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). The minimum wall thickness can be used for new pipe, or pipe in good condition. The pressure design wall thickness should be used for corroded pipe. The pipe diameter can be defined from either the outside diameter, or the inside diameter. For combined internal and external pressure use the pressure difference in the calculations. 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 104.1 Pipe Wall Hoop Stress (Metal Pipe) [FREE]   ±

Calculate hoop stress from internal pressure for low pressure steel pipe (ASME B31.1 section 104.1).

The minimum wall thickness may be used for uncorroded pipe, or where the minimum wall thickness has been measured (nominal wall thickness minus fabrication allowance). The pressure design wall thickness should be used for corroded pipe (minimum wall thickness minus corrosion allowance).

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
  • wfactype : Weld Factor Type
    • Wu : User Defined W Factor
    • Tcr : Creep Temperature (Other Materials)
  • yfactype : Y Factor Type
    • Yu : User Defined Y Coefficient
  • walltype : Hoop Stress Wall Thickness Type
  • A : Corrosion Allowance
  • T : Design Temperature
  • P : Design Pressure
  • SE : Allowable Stress

Tool Output

  • D : Pipe Outside Diameter
  • D/tn : Diameter Over Wall Thickness Ratio
  • SEW : Design Stress
  • Sh : Hoop Stress
  • Sh/SEW : Hoop Stress Over Design Stress Ratio (≤ 1)
  • W : Weld Joint Reduction Factor
  • 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 N104.1 Pipe Wall Hoop Stress (Plastic Pipe) [FREE]   ±

Calculate hoop stress from internal pressure for low pressure plastic pipe (ASME B31.1 section N104.1).

The minimum wall thickness may be used for as new pipe, or where the minimum wall thickness has been measured (nominal wall thickness minus fabrication allowance). The pressure design wall thickness should be used for worn pipe (minimum wall thickness minus corrosion allowance).

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
  • c : Mechanical Allowance
  • P : Design Pressure
  • S : Hydrostatic Design Stress

Tool Output

  • CVG : Convergence Factor
  • D : Pipe Outside Diameter
  • DR : Dimension Ratio (SDR or SIDR)
  • Sh : Hoop Stress
  • Sh/S : Hoop Stress Over Design 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 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 Hoop Stress From Operating Pressure (General) [FREE]   ±

Calculate ASME B31.1 general pipe hoop stress from operating pressure, 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
  • 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

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