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ASME B31.1 Power Piping Branch Reinforcement

Calculate ASME B31.1 power piping branch reinforcement for welded and extruded branches. Refer to the figures for details (click the resources button on the data bar)

For welded branches the branch angle must be ≥ 45 degrees. The pad reinforcement area also includes any welds or saddles which are inside the reinforcement zone. The extruded branch calculation is valid for right angle branches only. 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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Links : ±
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 Section 104.3 Pipeline Welded Branch Reinforcement [PLUS]   ±

Calculate required reinforcement area for welded branches (ASME B31.1 section 104.3). The actual reinforcement area includes the pad reinforcement area which is inside the reinforcement zone (the actual area equals the required area if the pad reinforcement is entirely inside the reinforcement zone).

Enter the header, branch and reinforcement wall thickness as either the minimum wall thickness (nominal wall thickness minus the negative fabrication tolerance), or the measured wall thickness. The minimum wall thickness includes the corrosion allowance.

The calculated design thickness is the required wall thickness for pressure containment (it does not include either the corrosion allowance or the fabrication tolerance). The welded branch calculation is valid for right angle branches, and angled branches (≥ 45 degrees).

The replacement area A4 includes reinforcement pads, welds and saddles inside the reinforcement zone.

Tool Input

  • schdtypea : Header Schedule Type
  • diamtypea : Header Diameter Type
    • ODhu : User Defined Header Outside Diameter
    • IDhu : User Defined Header Inside Diameter
  • wtntypea : Header Wall Thickness Type
    • tnhu : User Defined Header Wall Thickness
  • ttoltypeh : Header Wall Thickness Fabrication Tolerance Type
    • xfhu : User Defined Header Negative Wall Thickness Fraction
    • tfhu : User Defined Header Negative Wall Thickness Allowance
  • schdtypeb : Branch Schedule Type
  • diamtypeb : Branch Diameter Type
    • ODbu : User Defined Branch Outside Diameter
    • IDbu : User Defined Branch Inside Diameter
  • wtntypeb : Branch Wall Thickness Type
    • tnbu : User Defined Branch Wall Thickness
  • ttoltypeb : Branch Wall Thickness Fabrication Tolerance Type
    • xfbu : User Defined Branch Negative Wall Thickness Fraction
    • tfbu : User Defined Branch Negative Wall Thickness Allowance
  • yfactype : Y Factor Type
    • Yhu : User Defined Header Y Coefficient
    • Ybu : User Defined Branch Y Coefficient
  • betatype : Branch Angle Type
    • βu : User Defined Branch Angle
  • dlentype : Branch Opening Length Type
    • d1u : User Defined Branch Opening Length
  • SEW : Design Stress
  • c : Corrosion Allowance
  • tmr : Minimum Reinforcement Thickness
  • P : Design Pressure
  • T : Design Temperature

Tool Output

  • β : Branch Angle
  • A1 : Replacement Area Header Wall
  • A2 : Replacement Area Branch Wall
  • A4a : Actual Reinforcement Area
  • A4r : Required Reinforcement Area
  • A7 : Required Replacement Area
  • AT : Total Replacement Area
  • Db/Dh : Branch Diameter Over Header Diameter Ratio
  • L4 : Reinforcement Zone Height
  • ODb : Branch Outside Diameter
  • ODh : Header Outside Diameter
  • Yb : Branch Y Factor
  • Yh : Header Y Factor
  • d1 : Branch Opening Length
  • d2 : Half Width Of Reinforcement Zone
  • fb : Branch Design Stress Ratio
  • fp : Reinforcement Design Stress Ratio
  • tab : Branch Actual Pressure Design Wall Thickness
  • tah : Header Actual Pressure Design Wall Thickness
  • tfb : Branch Fabrication Allowance
  • tfh : Header Fabrication Allowance
  • tnb : Branch Nominal Wall Thickness
  • tnh : Header Nominal Wall Thickness
  • trb : Branch Required Pressure Design Wall Thickness
  • trh : Header Required Pressure Design Wall Thickness
  • wa : Actual Reinforcement Width (Including Welds)
  • wr : Required Reinforcement Width (Including Welds)

CALCULATOR : ASME B31.1 Section 104.3 Pipeline Extruded Branch Reinforcement [PLUS]   ±

Calculate required reinforcement area for extruded branches (ASME B31.1 section 104.3).

Enter the header and branch wall thickness as either the minimum wall thickness (nominal wall thickness minus the negative fabrication tolerance), or the measured wall thickness. The minimum wall thickness includes the corrosion allowance.

The calculated design thickness is the required wall thickness for pressure containment (it does not include either the corrosion allowance or the fabrication tolerance). The extruded branch calculation is valid for right angle branches only.

Tool Input

  • schdtypea : Header Schedule Type
  • diamtypea : Header Diameter Type
    • ODhu : User Defined Header Outside Diameter
    • IDhu : User Defined Header Inside Diameter
  • wtntypea : Header Wall Thickness Type
    • tnhu : User Defined Header Wall Thickness
  • ttoltypeh : Header Wall Thickness Fabrication Tolerance Type
    • xfhu : User Defined Header Negative Wall Thickness Fraction
    • tfhu : User Defined Header Negative Wall Thickness Allowance
  • schdtypeb : Branch Schedule Type
  • diamtypeb : Branch Diameter Type
    • ODbu : User Defined Branch Outside Diameter
    • IDbu : User Defined Branch Inside Diameter
  • wtntypeb : Branch Wall Thickness Type
    • tnbu : User Defined Branch Wall Thickness
  • ttoltypeb : Branch Wall Thickness Fabrication Tolerance Type
    • xfbu : User Defined Branch Negative Wall Thickness Fraction
    • tfbu : User Defined Branch Negative Wall Thickness Allowance
  • yfactype : Y Factor Type
    • Yhu : User Defined Header Y Coefficient
    • Ybu : User Defined Branch Y Coefficient
  • dlentype : Branch Inside Diameter Type
    • dxu : User Defined Branch Inside Diameter
  • SEW : Design Stress
  • c : Corrosion Allowance
  • ro : Extrusion Radius
  • To : Minimum Thickness Of Extrusion Branch At Height rx
  • P : Design Pressure
  • T : Design Temperature

Tool Output

  • A1 : Replacement Area Header Wall
  • A2 : Replacement Area Branch Wall
  • A4 : Replacement Area Extruded Lip
  • A7 : Required Replacement Area
  • AT : Total Replacement Area
  • AX : Additional Replacement Area Required (≥ 0)
  • Db/Dh : Branch Diameter Over Header Diameter Ratio
  • K : Required Area K Factor
  • L8 : Reinforcement Zone Height
  • ODb : Branch Outside Diameter
  • ODh : Header Outside Diameter
  • Yb : Branch Y Factor
  • Yh : Header Y Factor
  • dc : Branch Inside Diameter
  • r1 : Reinforcement Zone Half Width
  • tab : Branch Actual Pressure Design Wall Thickness
  • tah : Header Actual Pressure Design Wall Thickness
  • tax : Extruded Lip Actual Pressure Design Wall Thickness
  • tfb : Branch Fabrication Allowance
  • tfh : Header Fabrication Allowance
  • tnb : Branch Nominal Wall Thickness
  • tnh : Header Nominal Wall Thickness
  • trb : Branch Required Pressure Design Wall Thickness
  • trh : Header Required Pressure Design Wall Thickness

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
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