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AS 2885.1 Pipeline Branch Reinforcement

Calculate AS 2885.1 pipeline welded branch reinforcement using the replacement area method.

Branch reinforcement can be provided by pipe excess thickness, and by welded pad reinforcement. The reinforcement must be inside the reinforcement zone. Pad reinforcement can include additional equivalent width to account for welds, provided that the equivalent width is inside the reinforcement zone. The header, branch and reinforcement material should have similar properties. The reinforcement areas are factored if the branch or pad reinforcement allowable stress is less than the header allowable stress.

Reference : Australian Standard AS 2885.1 : Pipelines - Gas And Liquid Petroleum Part 1 : Design And Construction (2015)

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CALCULATOR : AS 2885.1 Section 5.9.5 Appendix Z Pipeline Welded Branch Reinforcement [PLUS]   ±

Calculate pipeline welded branch reinforcement area (AS 2885.1 section 5.9.5 and appendix Z).

The required reinforcement area is calculated using the equivalent area methodology. Reinforcement can be provided by branch and header pipe excess thickness and pad reinforcement (reinforcement must be inside the reinforcement zone). The pad thickness is defined, and the pad width is calculated. The pad width can include an equivalent width to account for weld areas inside the reinforcement zone. The branch area and the pad area are factored if the allowable stress is less than the header allowable stress).

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 Fabrication Tolerance Type
    • xhu : User Defined Negative Wall Thickness Fraction
    • Hhu : User Defined Negative Wall Thickness Allowance
  • 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
  • ttoltypeb : Branch Fabrication Tolerance Type
    • xbu : User Defined Negative Wall Thickness Fraction
    • Hbu : User Defined Negative Wall Thickness Allowance
  • syutypeb : Branch Stress Type
  • mattypeb : Branch Material Type
    • SMYSbu : User Defined Branch Specified Minimum Yield Stress
  • satype : Allowable Stress Calculation Type
    • Fdu : User Defined Allowable Stress Factor
    • Sahu : User Defined Header Allowable Stress
    • Sabu : User Defined Branch Allowable Stress
    • Saru : User Defined Reinforcement Allowable Stress
    • SMYSru : User Defined Reinforcement Specified Minimum Yield Stress
  • dlentype : Branch Opening Length Type
    • dou : User Defined Branch Opening Length
  • G : Corrosion Allowance
  • tr : Corroded Pad Reinforcement Thickness
  • P : Design Pressure

Tool Output

  • A1 : Replacement Area Branch Wall
  • A2 : Replacement Area Header Wall
  • A3a : Actual Pad Reinforcement Area
  • A3r : Required Pad Reinforcement Area
  • AR : Required Replacement Area
  • AT : Total Replacement Area
  • Ax : Xtra Pad Reinforcement Area Needed (<= 0)
  • Db/Dh : Branch Diameter Over Header Diameter Ratio
  • I : Reinforcement Zone Half Width
  • I1 : Branch Inside Diameter
  • I2 : Branch Opening Length
  • I3 : Header Reinforcement Length
  • IA : Reinforcement Zone Height
  • ODb : Branch Outside Diameter
  • ODh : Header Outside Diameter
  • Sab : Branch Allowable Stress
  • Sah : Header Allowable Stress
  • Sar : Reinforcement Allowable Stress
  • fb : Branch Design Stress Ratio
  • fr : Reinforcement Design Stress Ratio
  • tnb : Branch Nominal Wall Thickness
  • tnh : Header Nominal Wall Thickness
  • tpb : Branch Required Pressure Design Wall Thickness
  • tph : Header Required Pressure Design Wall Thickness
  • twb : Branch Actual Pressure Design Wall Thickness
  • twh : Header Actual Pressure Design Wall Thickness
  • wa : Actual Pad Reinforcement Width (Including Welds)
  • wr : Required Pad Reinforcement Width (Including Welds)

CALCULATOR : AS 2885.1 Section 5.4.3 Pipeline Allowable Stress [FREE]   ±

Calculate pipeline allowable stress from specified minimum yield stress (SMYS) and design factor (AS 2885.1 section 5.4.3).

Use the Result Table option to display a table of SMYS and allowable stress versus material grade for the selected material schedule.

Tool Input

  • syutype : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • dfactype : Allowable Stress Factor Type
    • Fdu : User Defined Allowable Stress Factor

Tool Output

  • Fd : Allowable Stress Factor
  • SMYS : Yield Stress
  • Sa : Allowable Stress
CALCULATOR : AS 2885.1 Pipeline Diameter And Wall Thickness Schedule [FREE]   ±

Calculate AS 2885.1 pipeline diameter and wall thickness.

The pressure design wall thickness is equal to the nominal wall thickness minus the corrosion allowance. The fabrication allowance is accounted for in the design factor (an additional fabrication allowance is required in some cases). Select the pipe schedule (NPS or ISO etc), 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.

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
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