Pipeng Toolbox : AS 2885.1 Wall Thickness Calculators Blank User
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AS 2885.1 Pipeline Wall Thickness

Calculate AS 2885.1 pipeline wall thickness from hoop stress for dry and submerged pipelines.

Pipe wall thickness is governed by the maximum internal pressure for dry pipelines, or the maximum pressure difference for wet pipeline sections. For dry pipelines, the maximum internal pressure occurs at the lowest point on the pipeline or pipeline section. For wet oil and gas pipelines with internal fluid SG less than 1, the maximum pressure difference occurs at the highest submerged elevatin (eg the water surface). The required wall thickness should be calculated for each different section based on the primary and secondary location class. For each section, a wall thickness should be selected which is greater than or equal to the required wall thickness for the whole section.

Use the Result Plot option to plot either the calculated wall thickness versus elevation, or the hoop stress versus elevation for the selected wall thickness. Wall thickness is calculated using Barlow's formula. The fabrication allowance is 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 Wall Thickness From Hoop Stress (Dry) [FREE]   ±

Calculate pipeline wall thickness from hoop stress and elevation for dry or onshore pipelines (AS 2885.1 section 5.4.3).

Pipe wall thickness can be calculated from either the outside diameter (constant OD pipe), or the inside diameter (constant ID pipe). 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. Pipeline wall thickness should be calculated for the maximum internal pressure along the pipeline or pipeline section (accounting for variations in elevation and fluid density etc). For dry pipelines, the maximum internal pressure occurs at the lowest point.

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 Calculation Type
    • Fdu : User Defined Allowable Stress Factor
    • Sau : User Defined Allowable Stress
  • walltype : Wall Thickness Calculation Type
  • G : Corrosion Allowance

Tool Output

  • CVG : Convergence Factor
  • D/tn : Pipe Diameter Over Wall Thickness Ratio
  • Fd : Allowable Stress Factor
  • H : Wall Thickness Fabrication Allowance
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • PR : Rated Pressure
  • Pld : Local Design Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sa : Allowable Stress
  • Sh : Pipe Hoop Stress
  • Sh/Sa : Hoop Stress Over Allowable Stress Ratio
  • 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 Wall Thickness From Hoop Stress (Submerged) [FREE]   ±

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

Pipe wall thickness can be calculated from either the outside diameter (constant OD pipe), or the inside diameter (constant ID pipe). 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. Pipeline wall thickness should be calculated for the maximum pressure difference along the pipeline or pipeline section (accounting for variations in elevation and fluid density etc). For wet pipelines with an internal fluid SG < 1, the maximum pressure difference occurs at the highest submerged point.

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 Calculation Type
    • Fdu : User Defined Allowable Stress Factor
    • Sau : User Defined Allowable Stress
  • walltype : Wall Thickness Calculation Type
  • G : Corrosion Allowance

Tool Output

  • CVG : Convergence Factor
  • D/tn : Pipe Diameter Over Wall Thickness Ratio
  • Fd : Allowable Stress Factor
  • H : Wall Thickness Fabrication Allowance
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • PR : Rated Pressure
  • Pld : Local Design Pressure Across Pipe Wall
  • Ple : Local External Fluid Pressure
  • Pli : Local Internal Fluid Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sa : Allowable Stress
  • Sh : Pipe Hoop Stress
  • Sh/Sa : Hoop Stress Over Allowable Stress Ratio
  • 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 Wall Thickness From Hoop Stress (General) [FREE]   ±

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

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 : Wall Thickness Calculation Type
    • Yu : User Defined ASME Y Factor
  • calctype : 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 : Pipe Hoop Stress
  • Sh/Sd : Hoop Stress Over Design Stress Ratio
  • cvg : Convergence Check
  • 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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