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ASME B31.1 Power Piping Bend

Calculate ASME B31.1 power piping formed bend minimum thickness and miter bend allowable pressure.

Use the goal seek option to calculate the straight pipe nominal thickness. 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 102.3 Pipe W Weld Joint Factor From Temperature [FREE]   ±

Calculate the pipe weld joint reduction factor W from the maximum temperature (ASME B31.1 table 102.4.7). For carbon steel the weld joint reduction factor is 1.0.

For other materials, the weld joint reduction factor is interpolated from table 102.4.7.

Note : The calculated weld joint factors are not valid if the metal temperature is greater than the temperature range in appendix A for that particular material.

Tool Input

  • wfactype : Weld Factor Type
    • Wu : User Defined W Factor
    • Tcr : User Defined Creep Temperature
  • T : Design Temperature

Tool Output

  • W : Weld Factor
CALCULATOR : ASME B31.1 Section 102.4 Pipe Bend Wall Thickness [FREE]   ±

Calculate pipe bend minimum required wall thickness and estimated wall thickness after thinning. (ASME B31.1 section 102.4).

Enter the straight pipe diameter and nominal wall thickness (before thinning). The estimated wall thickness after thinning should be greater than or equal to the minimum required wall thickness on the outside radius. The bend thinning allowance is based on table 102.4.5. Use the goal seek option to calculate the required straight pipe nominal wall thickness for the minimum bend thickness (after thinning).

The thinning allowance is an estimate for the minimum thickness at the outside radius. The actual wall thickness measurements should be checked at the mid span of the bend on the inside bend radius (intrados), the outside bend radius (extrados), and the bend center line radius.

Tool Input

  • schdtype : Straight Pipe Schedule Type
  • diamtype : Straight Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Straight Pipe Wall Thickness Type
    • tnu : User Defined Straight Pipe Wall Thickness
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • rbtype : Bend Radius Type
    • Ru : User Defined Bend Radius
    • R/Du : User Defined Bend R / D Ratio
  • bendtype : Wall Thickness Position
  • yfactype : Y Factor Type
    • Yu : User Defined Y Coefficient
  • c : Wall Thickness Corrosion Allowance
  • P : Internal Pressure
  • SE : Design Stress
  • T : Design Temperature

Tool Output

  • B : Bend Thinning Factor
  • D : Straight Pipe Outside Diameter
  • D/tn : Straight Pipe Diameter Over Wall Thickness Ratio
  • I : Bend I Factor
  • R : Bend Center Line Radius
  • R/D : Bend Radius Over Pipe Diameter Ratio
  • Y : Straight Pipe Y Coefficient
  • d : Straight Pipe Inside Diameter
  • t : Bend Pressure Design Wall Thickness
  • tf : Straight Pipe Wall Thickness Fabrication Allowance
  • tmb : Bend Minimum Required Wall Thickness After Thinning
  • tme : Estimated Bend Minimum Wall Thickness After Thinning
  • tmp : Straight Pipe Minimum Wall Thickness
  • tn : Straight Pipe Nominal Wall Thickness

CALCULATOR : ASME B31.1 Section 104.3 Pipe Single Miter Bend Wall Thickness [FREE]   ±

Calculate pipe miter bend maximum allowable pressure for single miter bends (ASME B31.1 section 104.3).

Note : The equation has been rearranged to calculate maximum pressure rather than minimum wall thickness. Use the goal seek option to calculate the required wall thickness for a target pressure.

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 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
  • c : Corrosion Allowance
  • SEW : Design Stress
  • T : Design Temperature
  • θ : Miter Cutoff Angle Or Half Miter Angle (&le 22.5 deg)

Tool Output

  • D : Pipe Outside Diameter
  • D/tn : Diameter Over Wall Thickness Ratio
  • Pm : Maximum Allowable Internal Pressure
  • Y : Y Coefficient
  • d : Pipe Inside Diameter
  • r : Mean Radius Of Pipe Using Nominal Wall
  • t : Miter Bend Pressure Containment Wall Thickness
  • tf : Wall Thickness Fabrication Allowance
  • tm : Miter Bend Minimum Wall Thickness
  • tn : Nominal Wall Thickness

CALCULATOR : ASME B31.1 Section 104.3 Pipe Compound Miter Bend Wall Thickness [FREE]   ±

Calculate pipe miter bend maximum allowable pressure for compound miter bends (ASME B31.1 section 104.3).

Note : The equation has been rearranged to calculate maximum pressure rather than minimum wall thickness. Use the goal seek option to calculate the required wall thickness for a target pressure.

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 Miter Bend Wall Thickness
  • ttoltype : Wall Thickness 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
  • c : Corrosion Allowance
  • SEW : Design Stress
  • T : Design Temperature
  • θ : Miter Cutoff Angle Or Half Miter Angle (&le 22.5 deg)
  • s : Miter Bend Center Line Section Length

Tool Output

  • D : Pipe Outside Diameter
  • D/tn : Diameter Over Wall Thickness Ratio
  • Pm : Maximum Allowable Internal Pressure
  • R : Effective Radius Of Compound Miter Bend
  • Y : Y Coefficient
  • d : Pipe Inside Diameter
  • r : Mean Radius Of Pipe Using Nominal Wall
  • st : Transition Length Closely Spaced To Widely Spaced
  • t : Miter Bend Pressure Containment Wall Thickness
  • tf : Wall Thickness Fabrication Allowance
  • tm : Miter Bend Minimum Wall Thickness
  • tn : Nominal Wall Thickness

CALCULATOR : ASME B31.1 Section 102.4 Pipe Bend Thinning Allowance [FREE]   ±

Calculate pipe bend thinning allowance and bend minimum thickness from the straight pipe nominal wall thickness and the bend radius (ASME B31.1 section 102.4 table 102.4.5).

A power law curve has been fitted to the data in table 102.4.5. Use the goal seek option to calculate the straight pipe nominal wall thickness for a required bend minimum thickness. The bend thinning allowance is an estimate only. Actual bend measurements should be checked after bending at the outside bend radius (extrados).

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 Miter Bend Wall Thickness
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • rbtype : Bend Radius Type
    • Ru : User Defined Bend Radius
    • R/Du : User Defined Bend R / D Ratio

Tool Output

  • B : Bend Thinning Factor
  • D : Straight Pipe Outside Diameter
  • D/tn : Straight Pipe Diameter Over Wall Thickness Ratio
  • R : Bend Center Line Radius
  • R/D : Bend Radius Over Pipe Diameter Ratio
  • tf : Straight Pipe Wall Thickness Fabrication Allowance
  • tme : Estimated Bend Minimum Wall Thickness After Thinning
  • tmp : Straight Pipe Minimum Wall Thickness
  • tn : Nominal Wall Thickness

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