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ASME B31.5 Refrigeration Piping Branch Reinforcement

Calculate ASME B31.5 refrigeration piping required branch reinforcement for welded and extruded branches.

The calculations are valid for right angle welded branches, angled welded branches ≥ 45 degrees, and right anngle extruded branches.

Use the pipe wall thickness calculators to calculate design stress, minimum thickness and Y factor for the header pipe and branch pipe (use the user defined wall thickness option). Use the allowable stress calculators to calculate the design stress for the reinforcement pad. Use the workbook ASME B31.5 data tables to look up allowable stress data.

Reference : ANSI/ASME B31.5 : Refrigeration Piping And Heat Transfer Components (2013)

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CALCULATOR : ASME B31.5 Section 504.1 Pipe Schedule Diameter And Wall Thickness [FREE]   ±

Calculate ASME B31.5 pipe diameter, minimum wall thickness and pressure design thickness from pipe schedule or user defined diameter and wall thickness (ASME B31.5 section 504.1).

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 B31.5 Section 304.3 Pipe Welded Branch Reinforcement [PLUS]   ±

Calculate required reinforcement area for welded branches (ASME B31.5 section 504.3). 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 (&beta ≥ 45 degrees).

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
  • S : Design Stress
  • c : Corrosion Allowance
  • tmr : Minimum Reinforcement Thickness
  • P : Design Pressure

Tool Output

  • β : Branch Angle
  • A1 : Required Replacement Area
  • A2 : Replacement Area Header Wall
  • A3 : Replacement Area Branch Wall
  • A4a : Actual Reinforcement Area
  • A4r : Required Reinforcement 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
  • fr : 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 B31.5 Section 304.3 Pipe Extruded Branch Reinforcement [PLUS]   ±

Calculate required reinforcement area for extruded branches (ASME B31.5 section 504.3).

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
  • S : Design Stress
  • c : Corrosion Allowance
  • rx : Extrusion Radius
  • Tx : Minimum Thickness Of Extrusion Branch At Height rx
  • P : Design Pressure

Tool Output

  • A1 : Required Replacement Area
  • A2 : Replacement Area Header Wall
  • A3 : Replacement Area Branch Wall
  • A4 : Replacement Area Extruded Lip
  • AT : Total Replacement Area
  • AX : Additional Replacement Area Required (≥ 0)
  • Db/Dh : Branch Diameter Over Header Diameter Ratio
  • K : Required Area K Factor
  • L5 : Reinforcement Zone Height
  • ODb : Branch Outside Diameter
  • ODh : Header Outside Diameter
  • Yb : Branch Y Factor
  • Yh : Header Y Factor
  • d2 : Reinforcement Zone Half Width
  • dx : Branch Inside Diameter
  • 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 B31.5 Section 504.1 Pipe Y Factor [FREE]   ±

Calculate the hoop stress Y factor for metals (ASME B31.5 section 504.1). For pipe D / t > 6, the Y factor is taken from section 504.1.1. For pipe 4 ≥ D / t ≤ 6, the Y factor is calculated from the equation in section 504.1.1.

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
  • ttoltype : Wall Thickness Fabrication Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • yfactype : Y Coefficient Type
    • Yu : User Defined Y Coefficient
  • c : Corrosion Allowance

Tool Output

  • D : Nominal Outside Diameter
  • D/t : Diameter Over Pressure Design Thickness Ratio
  • Y : Y Coefficient
  • d : Nominal Inside Diameter
  • t : Pressure Design Wall Thickness
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness

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