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ASME B31.1 Power Piping Plastic Components

Calculate ASME B31.1 power piping wall thickness, hoop stress and hydrotest pressure for plastic piping.

Pipe diameter can be defined by either outside diameter, or inside diameter. Use the workbook ASME B31.1 data tables to look up allowable stress.

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

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CALCULATOR : ASME B31.1 Section N104.1 Pipe Wall Thickness From Hoop Stress (Plastic Pipe [FREE]   ±

Calculate pipe wall thickness for pressure containment for low pressure plastic pipe (ASME B31.1 section N104.1).

Pipe wall thickness may be calculated from either the outside diameter (constant OD pipe), or the inside diameter (constant ID pipe). The hydrostatic design stress should be taken from tables N-102.2.1(A)-1 to N-102.2.1(A)-3. For RTR filament wound and RPM centrifugal cast pipe multiply the hydrostatic design basis by the service design factor to calculate the hydrostatic design stress.

All user defined tolerances should be positive. The mechanical allowance should include mechanical allowance (eg threads), erosion allowance and any other allowances.

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
  • walltype : Wall Thickness Calculation Type
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • 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)
  • PR : Rated Pressure
  • Sh : Hoop Stress (≤ S)
  • Sh/S : Hoop Stress Over Design Stress Ratio (≤ 1)
  • d : Pipe Inside Diameter
  • t : Pressure Containment Wall Thickness
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness
  • xf : Wall Thickness Fabrication Fraction
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 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 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 Wall Thickness From Hoop Stress (General) [FREE]   ±

Calculate ASME B31.1 general pipe wall thickness from diameter, 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 : Wall Thickness Calculation Type
    • Yu : User Defined ASME Y Factor
  • calctype : 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 : Pipe Hoop Stress
  • Sh/Sd : Hoop Stress Over Design Stress Ratio
  • cvg : Convergence Check
  • tf : Fabrication Allowance
  • tfx : Fabrication Fraction
  • th : Hoop Stress Thickness (Pressure Containment)
  • tm : Minimum Wall Thickness
  • tn : Nominal 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

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

CALCULATOR : ASME B31.1 Pipe Design Pressure (General) [FREE]   ±

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

The hoop stress is equal to the design stress at the design pressure. External pressure should be ignored (use the no external pressure option).

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.

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
  • tc : Corrosion Allowance

Tool Output

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