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API 5L Line Pipe

Calculate API 5L line pipe diameter, wall thickness and mass schedule.

For some pipe codes (eg ASME B31.4, ASME B31.8, API RP 111 and AS 2885.1) the fabrication tolerance is included in the design factor, and provided that fabrication tolerances are within the relevant specification. For these codes the pressure design or pressure containment wall thickness equals the nominal wall thickness minus the corrosion and mechanical allowance.

For other codes (eg ASME B31.1, ASME B31.3 and ASME B31.5) the fabrication tolerance must be included in the pressure design calculation. For these codes the minimum wall thickness equals the nominal wall thickness minus the fabrication allowance. The pressure containment wall thickness equals the nominal wall thickness minus the fabrication allowance, and minus the corrosion allowance. Fabrication tolerance can be defined by either a fabrication allowance, or a fabrication fraction.

The pipe diameter can be defined by either the outside diameter or the inside diameter. Use the Result Table option to display a table of pipe schedule versus wall thickness for the selected diameter.

References :

API 5L : Specification for Line Pipe (2007)
ISO 3183 : Petroleum and Natural Gas Industries - Steel Pipe For Pipeline Transportation Systems (2007)

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Links : ±
CALCULATOR : Line Pipe Diameter And Wall Thickness Schedule (With Fabrication Tolerance) [FREE]   ±

Calculate inside diameter, outside diameter and wall thickness from pipe schedule.

Select the pipe shedule, pipe diameter and pipe wall thickness. Use the Result Table option to display the diameter and wall thickness results 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 : Line Pipe Diameter And Wall Thickness Schedule (No Fabrication Tolerance) [FREE]   ±

Calculate line pipe diameter and pressure design wall thickness (nominal wall thickness minus corrosion allowance) from nominal wall thickness.

Some codes do not include fabrication tolerance in the wall thickness calculations (eg ASME B31.4, ASME B31.8, API RP 1111 and AS 2885). The fabrication allowance is accounted for in the design factor and is not included when calculating the pressure design thickness.

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
CALCULATOR : Line Pipe Unit Mass And Total Mass Schedule (No Fabrication Tolerance) [FREE]   ±

Calculate line pipe unit mass and total mass (construction quantities) from pipe length, diameter, wall thickness and density.

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 unit mass and total mass 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
  • modptype : Material Property Type
    • ρpu : User Defined Pipe Density
  • L : Pipe Length

Tool Output

  • ρp : Pipe Density
  • ID : Nominal Inside Diameter
  • M : Pipe Total Mass
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • m : Pipe Mass Per Length
  • tn : Nominal Wall Thickness
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