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ASME B31.3 Process Piping Branch Reinforcement

Calculate ASME B31.3 process 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. Extruded branches must be used for high pressure piping. Use the workbook ASME B31.3 data tables to look up allowable stress data.

Reference : ANSI/ASME B31.3 : Process Piping (2018)

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CALCULATOR : ASME B31.3 Metal Pipe Diameter And Wall Thickness Schedule [FREE]   ±

Calculate ASME B31.3 metal pipe diameter, minimum wall thickness and pressure design thickness from pipe schedule or user defined diameter and wall thickness (ASME B31.3 section 304.1).

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 B31.3 Table A-1 Low Pressure Metal Pipe Yield Stress Tensile Stress And Basic Allowable Stress Schedule [FREE]   ±

Calculate low pressure metal pipe SMYS (Specified Minimum Yield Stress), SMTS (Specified Minimum Tensile Stress) and basic allowable stress schedule (ASME B31.3 table A-1).

Use the Result Table option to display the stress values for the selected stress schedule (click the Result Table button, and then click the make table button).

Tool Input

  • syutype : Stress Schedule Type
  • mattype : Material Type
    • SMTSu : User Defined Specified Minimum Tensile Stress
    • SMYSu : User Defined Specified Minimum Yield Stress
    • Su : User Defined Basic Allowable Stress

Tool Output

  • S : Basic Allowable Stress
  • S/SMTS : Basic Allowable Stress Over SMTS Ratio
  • S/SMYS : Basic Allowable Stress Over SMYS Ratio
  • SMTS : Specified Minimum Tensile Stress
  • SMTS/SMYS : SMTS Over SMYS Ratio
  • SMYS : Specified Minimum Yield Stress
  • SMYS/SMTS : SMYS Over SMTS Ratio
CALCULATOR : ASME B31.3 Table K-1 High Pressure Metal Pipe Yield Stress Tensile Stress And Allowable Stress Schedule [FREE]   ±

Calculate high pressure metal pipe SMYS (Specified Minimum Yield Stress), SMTS (Specified Minimum Tensile Stress) and allowable stress schedule (ASME B31.3 table K-1).

Use the Result Table option to display the stress values for the selected stress schedule (click the Result Table button, and then click the make table button).

Tool Input

  • syutype : Stress Schedule Type
  • mattype : Material Type
    • SMTSu : User Defined Specified Minimum Tensile Stress
    • SMYSu : User Defined Specified Minimum Yield Stress
    • Su : User Defined Allowable Stress

Tool Output

  • S : Basic Allowable Stress
  • S/SMTS : Basic Allowable Stress Over SMTS Ratio
  • S/SMYS : Basic Allowable Stress Over SMYS Ratio
  • SMTS : Specified Minimum Tensile Stress
  • SMTS/SMYS : SMTS Over SMYS Ratio
  • SMYS : Specified Minimum Yield Stress
  • SMYS/SMTS : SMYS Over SMTS Ratio
CALCULATOR : ASME B31.3 Section 304.3 Pipe Welded Branch Reinforcement (Low Pressure Steel Piping) [PLUS]   ±

Calculate the required replacement area for low pressure piping welded branches using the area replacment area method (ASME B31.3 section 304.3).

Extra replacement area can be provided either by increasing the wall thickness of the header and branch, or by adding reinforcement (such as a reinforcement pad). The required width of a reinforcement pad is calculated for a defined pad thickness. The reinforcement pad thickness should be adjusted so that the entire pad with is inside the reinforcement zone (the actual pad width is the pad width inside the reinforcement zone). Welds and collars etc can be accounted for as an equivalent pad width provided that they are entirely within the reinforcement zone.

The welded branch calculation is valid for right angle branches, and angled branches. The low pressure calculators should be used when the design pressure is less than or equal to the allowed pressure for ASME B16.5 Class 2500 rating for the specified design temperature and material group.

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 : 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 B31.3 Section 304.3 Pipe Extruded Branch Reinforcement (Low Pressure Steel Piping) [PLUS]   ±

Calculate the required replacement area for low pressure piping extruded branches using the area replacment area method (ASME B31.3 section 304.4).

Extra replacement area (if required) can be provided by increasing the wall thickness of the header and branch. The lip minimum wall thickness is either the measured minimum thickness, or the minimum specified wall thickness.

The extruded branch calculation is valid for right angle branches only. The low pressure calculators should be used when the design pressure is less than or equal to the allowed pressure for ASME B16.5 Class 2500 rating for the specified design temperature and material group.

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
  • rx : Extrusion Radius
  • tmbx : Minimum Thickness Of Extrusion Branch At Height rx
  • P : Internal Pressure
  • T : Design Temperature

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

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