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ASME B31.8 Gas Pipeline Branch Reinforcement

Calculate ASME B31.8 gas pipeline welded and extruded branch reinforcement for onshore and offshore pipelines.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018)

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CALCULATOR : ASME B31.8 Metal Pipe Diameter And Wall Thickness Schedule [FREE]   ±

Calculate ASME B31.8 metal pipe diameter and pressure design wall thickness from pipe schedule or user defined diameter and wall thickness (ASME B31.8 section 841.1). For ASME B31.8 the fabrication tolerance is accounted for in the design factor. The fabrication tolerance is ignored when calculating the pressure design thickness. The pressure design thickness equals the nominal thickness minus the corrosion allowance.

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 and pressure design wall thickness for the selected diameter. Fabrication tolerance is ignored.

Tool Input

  • schdtype : Line Pipe Schedule Type
  • diamtype : Line Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • c : Wall Thickness Corrosion Allowance

Tool Output

  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness
CALCULATOR : ASME B31.8 Section 831.4 Pipeline Welded Branch Reinforcement (Onshore) [PLUS]   ±

Calculate onshore pipeline welded branch reinforcement area (ASME B31.8 831.4 and Appendix F).

The calculated reinforcement width is for an assumed rectangular reinforcement cross section, and equal reinforcement cross section area on both sides of the opening. The reinforcing strip must be 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
  • syutypea : Header Stress Type
  • mattypea : Header Material Type
    • SMYShu : User Defined Header Specified Minimum Yield Stress
  • efactypeh : Header Weld Joint Quality Factor Type
    • Ehu : User Defined Header Quality Factor
  • 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
  • syutypeb : Branch Stress Type
  • mattypeb : Branch Material Type
    • SMYSbu : User Defined Branch Specified Minimum Yield Stress
  • efactypeb : Branch Weld Joint Quality Factor Type
    • Ebu : User Defined Branch Quality Factor
  • tfactype : Temperature Derating Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor
  • loctype : Location Class
    • Fu : User Defined Design Stress Factor
  • pipetype : Pipe Section Type
  • satype : Allowable Stress Calculation Type
    • Sahu : User Defined Header Allowable Stress
    • Sabu : User Defined Branch Allowable Stress
  • calctype : Barlow Hoop Stress Equation Type
  • dlentype : Branch Opening Length Type
    • dou : User Defined Branch Opening Length
  • c : Corrosion Allowance
  • tr : Corroded Pad Reinforcement Thickness
  • SFTp : Pad Design Stress
  • P : Design Pressure

Tool Output

  • AB : Replacement Area Branch Wall
  • AH : Replacement Area Header Wall
  • APa : Actual Pad Reinforcement Area
  • APr : Required Pad Reinforcement Area
  • AR : Required Replacement Area
  • AT : Total Replacement Area
  • Db/Dh : Branch Diameter Over Header Diameter Ratio
  • Eb : Branch Weld Joint Factor
  • Eh : Header Weld Joint Factor
  • F : Design Stress Factor
  • Lz : Reinforcement Zone Height
  • ODb : Branch Outside Diameter
  • ODh : Header Outside Diameter
  • SEFTb : Branch Allowable Stress
  • SEFTh : Header Allowable Stress
  • SMYSB : Branch Yield Stress
  • SMYSH : Header Yield Stress
  • T : Temperature Reduction Factor
  • do : Branch Opening Length
  • dz : Reinforcement Zone Half Width
  • fb : Branch Design Stress Ratio
  • fr : Reinforcement Design Stress Ratio
  • tab : Branch Actual Pressure Design Wall Thickness
  • tah : Header Actual Pressure Design Wall Thickness
  • 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 Pad Reinforcement Width (Including Welds)
  • wr : Required Pad Reinforcement Width (Including Welds)

CALCULATOR : ASME B31.8 Section 831.4 Pipeline Extruded Branch Reinforcement (Onshore) [PLUS]   ±

Check onshore pipeline extruded branch reinforcement area (ASME B31.8 831.4 and Appendix F). The calculated reinforcing area should be greater than or equal to the required reinforcement area.

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
  • syutypea : Header Stress Type
  • mattypea : Header Material Type
    • SMYShu : User Defined Header Specified Minimum Yield Stress
  • 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
  • syutypeb : Branch Stress Type
  • mattypeb : Branch Material Type
    • SMYSbu : User Defined Branch Specified Minimum Yield Stress
  • efactypeb : Branch Weld Joint Quality Factor Type
    • Ebu : User Defined Branch Quality Factor
  • tfactype : Temperature Derating Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor
  • loctype : Location Class
    • Fu : User Defined Design Stress Factor
  • pipetype : Pipe Section Type
  • satype : Allowable Stress Calculation Type
    • Sahu : User Defined Header Allowable Stress
    • Sabu : User Defined Branch Allowable Stress
  • calctype : Barlow Hoop Stress Equation Type
  • dlentype : Branch Opening Length Type
    • dxu : User Defined Branch Opening Length
  • c : Corrosion Allowance
  • rx : Extrused Lip Radius Of Curvature
  • tnx : Extrused Lip Nominal Wall Thickness At Height rx
  • P : Design Pressure

Tool Output

  • AB : Replacement Area Branch Wall
  • AH : Replacement Area Header Wall
  • AL : Replacement Area Extruded Lip
  • AR : Required Replacement Area
  • AT : Total Replacement Area
  • AX : Required Extra Reinforcement Area
  • Db/Dh : Branch Diameter Over Header Diameter Ratio
  • Eb : Branch Weld Joint Factor
  • F : Design Stress Factor
  • K : Required Area Factor
  • Lz : Reinforcement Zone Height
  • ODb : Branch Outside Diameter
  • ODh : Header Outside Diameter
  • SEFTb : Branch Allowable Stress
  • SFTh : Header Allowable Stress
  • SMYSB : Branch Yield Stress
  • SMYSH : Header Yield Stress
  • T : Temperature Reduction Factor
  • dx : Branch Opening Length
  • dz : Reinforcement Zone Half Width
  • tab : Branch Actual Pressure Design Wall Thickness
  • tah : Header Actual Pressure Design Wall Thickness
  • tax : Extruded Lip Actual Pressure Design Thickness
  • 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 B31.8 Section 831.4 Pipeline Welded Branch Reinforcement (Offshore) [PLUS]   ±

Calculate offshore pipeline welded branch reinforcement area (ASME B31.8 831.4 and Appendix F).

The calculated reinforcement width is for an assumed rectangular reinforcement cross section, and equal reinforcement cross section area on both sides of the opening. The reinforcing strip must be inside the reinforcement zone. For offshore platforms and risers above the water line, the external pressure should be set to zero.

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
  • syutypea : Header Stress Type
  • mattypea : Header Material Type
    • SMYShu : User Defined Header Specified Minimum Yield Stress
  • 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
  • syutypeb : Branch Stress Type
  • mattypeb : Branch Material Type
    • SMYSbu : User Defined Branch Specified Minimum Yield Stress
  • tfactype : Temperature Derating Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor
  • loctype : Location Class
    • Fu : User Defined Design Stress Factor
  • satype : Allowable Stress Calculation Type
    • Sahu : User Defined Header Allowable Stress
    • Sabu : User Defined Branch Allowable Stress
  • calctype : Barlow Hoop Stress Equation Type
  • dlentype : Branch Opening Length Type
    • dou : User Defined Branch Opening Length
  • c : Corrosion Allowance
  • tr : Corroded Pad Reinforcement Thickness
  • SFTp : Pad Design Stress
  • P : Design Pressure

Tool Output

  • AB : Replacement Area Branch Wall
  • AH : Replacement Area Header Wall
  • APa : Actual Pad Reinforcement Area
  • APr : Required Pad Reinforcement Area
  • AR : Required Replacement Area
  • AT : Total Replacement Area
  • Db/Dh : Branch Diameter Over Header Diameter Ratio
  • F : Design Stress Factor
  • Lz : Reinforcement Zone Height
  • ODb : Branch Outside Diameter
  • ODh : Header Outside Diameter
  • SFTb : Branch Allowable Stress
  • SFTh : Header Allowable Stress
  • SMYSB : Branch Yield Stress
  • SMYSH : Header Yield Stress
  • T : Temperature Reduction Factor
  • do : Branch Opening Length
  • dz : Reinforcement Zone Half Width
  • fb : Branch Design Stress Ratio
  • fr : Reinforcement Design Stress Ratio
  • tab : Branch Actual Pressure Design Wall Thickness
  • tah : Header Actual Pressure Design Wall Thickness
  • 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 Pad Reinforcement Width (Including Welds)
  • wr : Required Pad Reinforcement Width (Including Welds)

CALCULATOR : ASME B31.8 Section 831.4 Pipeline Extruded Branch Reinforcement (Offshore) [PLUS]   ±

Check offshore pipeline extruded branch reinforcement area (ASME B31.8 831.4 and Appendix F). The calculated reinforcing area should be greater than or equal to the required reinforcement area. For offshore platforms and risers above the water line, the external pressure should be set to zero.

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
  • syutypea : Header Stress Type
  • mattypea : Header Material Type
    • SMYShu : User Defined Header Specified Minimum Yield Stress
  • 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
  • syutypeb : Branch Stress Type
  • mattypeb : Branch Material Type
    • SMYSbu : User Defined Branch Specified Minimum Yield Stress
  • tfactype : Temperature Derating Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor
  • loctype : Location Class
    • Fu : User Defined Design Stress Factor
  • satype : Allowable Stress Calculation Type
    • Sahu : User Defined Header Allowable Stress
    • Sabu : User Defined Branch Allowable Stress
  • calctype : Barlow Hoop Stress Equation Type
  • dlentype : Branch Opening Length Type
    • d1u : User Defined Branch Opening Length
  • c : Corrosion Allowance
  • rx : Extrused Lip Radius Of Curvature
  • tnx : Extrused Lip Nominal Wall Thickness At Height rx
  • P : Design Pressure

Tool Output

  • AB : Replacement Area Branch Wall
  • AH : Replacement Area Header Wall
  • AL : Replacement Area Extruded Lip
  • AR : Required Replacement Area
  • AT : Total Replacement Area
  • AX : Required Extra Reinforcement Area
  • Db/Dh : Branch Diameter Over Header Diameter Ratio
  • F : Design Stress Factor
  • K : Required Area Factor
  • Lz : Reinforcement Zone Height
  • ODb : Branch Outside Diameter
  • ODh : Header Outside Diameter
  • SFTb : Branch Allowable Stress
  • SFTh : Header Allowable Stress
  • SMYSB : Branch Yield Stress
  • SMYSH : Header Yield Stress
  • T : Temperature Reduction Factor
  • dx : Branch Opening Length
  • dz : Reinforcement Zone Half Width
  • tab : Branch Actual Pressure Design Wall Thickness
  • tah : Header Actual Pressure Design Wall Thickness
  • tax : Extruded Lip Actual Pressure Design Thickness
  • 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 B31.8 Section 841.1 Pipeline Temperature Derated Yield Stress And Tensile Stress [FREE]   ±

Calculate temperature derating factor, and derated yield stress and tensile stress from temperature (ASME B31.8 section 841.1).

Refer to Table 841.1.8-1 for the derating factors. The derating factors are valid for steel pipe upto 232 C (450 F). For temperatures above 232 C (450 F) the derating values should be used carefully (material specific test data should be used if it is available). The derating factor is assumed to be valid for yield stress and tensile stress. Use the Result Table option to display the results for the selected stress table (API, ASME or DNV). The temperature derating factor is not valid for nickel alloy, or stainless steel.

Tool Input

  • syutype : Stress Table Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • tfactype : Temperature Derating Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor

Tool Output

  • SMTS : Specified Minimum Tensile Stress
  • SMTS/SMYS : Tensile Stress Over Yield Stress Ratio
  • SMYS : Specified Minimum Yield Stress
  • SMYS/SMTS : Yield Stress Over Tensile Stress Ratio
  • Su : Derated Tensile Stress
  • Sy : Derated Yield Stress
  • T : Temperature Derating Factor
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