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AS 2885.1 Pipeline Hoop Stress

Calculate AS 2885.1 pipeline hoop stress from wall thickness and internal pressure.

Hoop stress is calculated using Barlow's formula. Hoop stress can be calculated for either the nominal wall thickness, the minimum wall thickness (nominal thickness minus fabrication allowance), or the pressure design wall thickness (nominal wall thickness minus fabrication allowance and general allowance). The fabrication allowance is only required for pipes where the fabrication tolerance exceeds the relevant specification (for example some seamless pipe).

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 5.4.3 Pipeline Hoop Stress (Dry) [PLUS]   ±

Calculate pipeline hoop stress from internal pressure and wall thickness for dry pipelines (AS 2885.1 section 5.4.3).

Pipeline hoop stress is calculated using Barlow's thin wall stress formula. Hoop stress can be calculated from nominal wall thickness, minimum wall thickness, or pressure containment wall thickness. Wall thickness tolerances are only required when the pipe tolerances exceeds the relevant standard (for example some cases of seamless pipe).

Tool Input

  • plitype : Internal Pressure Type
    • Priu : User Defined Reference Internal Pressure
    • Pliu : User Defined Local Internal Pressure
    • ρi : Internal Fluid Density
    • Zr : Reference Elevation
    • Zl : Local Elevation
  • schdtype : Line Pipe Schedule Type
  • diamtype : Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • ttoltype : Fabrication Tolerance Type
    • xu : User Defined Negative Wall Thickness Fraction
    • Hu : User Defined Negative Wall Thickness Allowance
  • syutype : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • satype : Allowable Stress Type
    • Fdu : User Defined Allowable Stress Factor
    • Sau : User Defined Allowable Stress
  • walltype : Hoop Stress Wall Thickness Type
  • G : Corrosion Allowance

Tool Output

  • Fd : Allowable Stress Factor
  • H : Wall Thickness Fabrication Allowance
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • Pld : Local Design Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sa : Allowable Stress
  • Sh : Hoop Stress
  • Sh/Sa : Hoop Stress Ratio
  • t* : Wall Thickness For Hoop Stress Calculation
  • tm : Minimum Fabrication Wall Thickness
  • tn : Pipe Nominal Wall Thickness
  • tp : Pipe Pressure Design Wall Thickness
  • x : Wall Thickness Fabrication Fraction
CALCULATOR : AS 2885.1 Section 5.4.3 Pipeline Hoop Stress (Submerged) [PLUS]   ±

Calculate pipeline hoop stress from internal pressure and wall thickness for wet or submerged pipelines (AS 2885.1 section 5.4.3).

Pipeline hoop stress is calculated using Barlow's thin wall stress formula. Hoop stress can be calculated from nominal wall thickness, minimum wall thickness, or pressure containment wall thickness. Wall thickness tolerances are only required when the pipe tolerances exceeds the relevant standard (for example some cases of seamless pipe).

Tool Input

  • plitype : Internal Pressure Type
    • Priu : User Defined Reference Internal Pressure
    • Pliu : User Defined Local Internal Pressure
    • ρi : Internal Fluid Density
    • Zr : Reference Elevation
    • Zl : Local Elevation
  • pletype : External Pressure Type
    • Pleu : User Defined Local External Pressure
    • ρe : External Fluid Density
    • Zs : Surface Elevation
  • schdtype : Line Pipe Schedule Type
  • diamtype : Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • ttoltype : Fabrication Tolerance Type
    • xu : User Defined Negative Wall Thickness Fraction
    • Hu : User Defined Negative Wall Thickness Allowance
  • syutype : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • satype : Allowable Stress Type
    • Fdu : User Defined Allowable Stress Factor
    • Sau : User Defined Allowable Stress
  • walltype : Hoop Stress Wall Thickness Type
  • G : Corrosion Allowance

Tool Output

  • Fd : Allowable Stress Factor
  • H : Wall Thickness Fabrication Allowance
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • Pld : Local Design Pressure
  • Ple : Local External Fluid Pressure
  • Pli : Local Internal Fluid Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sa : Allowable Stress
  • Sh : Hoop Stress
  • Sh/Sa : Hoop Stress Ratio
  • t* : Wall Thickness For Hoop Stress Calculation
  • tm : Minimum Fabrication Wall Thickness
  • tn : Pipe Nominal Wall Thickness
  • tp : Pipe Pressure Design Wall Thickness
  • wd : Water Depth
  • x : Wall Thickness Fabrication Fraction
CALCULATOR : AS 2885.1 Pipe Hoop Stress From Operating Pressure (General) [FREE]   ±

Calculate AS 2885.1 general pipe hoop stress or wall stress from diameter, wall thickness and design stress.

Pipe wall stress can be calculated for either the nominal wall thickness, the minimum wall thickness (nominal wall thickness minus fabrication allowance), or the hoop stress wall thickness (nominal wall thickness minus fabrication allowance and corrosion allowance).

For AS 2885.1 pipe, select the Barlow's equation outside diameter option. For onshore pipelines set the external pressure to zero. The manufacturing tolerance is normally ignored except for cases where the tolerance exceeds the relevant specification (eg some seamless pipe). All tolerances should be positive. The corrosion allowance should include mechanical allowance (eg threads), erosion allowance and any other allowances.

Tool Input

  • pletype : External Pressure Type
    • Peu : User Defined External Pressure
  • schdtype : Pipe Schedule Type
  • diamtype : Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • syutype : Stress Table Type
  • mattype : Yield Stress Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • sdtype : Design Stress Type (F x SMYS)
    • Fu : User Defined Design Factor
    • Sdu : User Defined Design Stress
  • walltype : Hoop Stress Calculation Type
    • Yu : User Defined ASME Y Factor
  • hooptype : Hoop Stress Wall Thickness Type
  • tc : Corrosion Allowance
  • Pi : Internal Pressure

Tool Output

  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • PΔ : Pressure Difference
  • Pe : External Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sd : Design Stress
  • Sh : Hoop Stress
  • Sh/Sd : Hoop Stress Over Design Stress Ratio
  • tf : Fabrication Allowance
  • tfx : Fabrication Fraction
  • th : Hoop Stress Thickness (Pressure Containment)
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness

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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