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API 5L Line Pipe Diameter Tolerance

Calculate API 5L line pipe maximum and minimum diameter from nominal diameter and tolerance.

Tolerances can be calculated from API 5L, or specified as either a diameter allowance or a diameter fraction.

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 : API 5L Section 9.11 Line Pipe Diameter Tolerance (Onshore) [FREE]   ±

Calculate onshore pipeline maximum and minimum diameter (API 5L section 9.11 table 10).

Diameter tolerances may be calculated from either API 5L, user defined fraction / percentage, or user defined allowance. All tolerances should be entered as positive values.

For line pipe with diameter D < 0.0603 [ m] the out of roundness is included with the diameter tolerance. For line pipe with diameter D ≥ 0.2191 [ m ] the diameter tolerance may also be calculated from the inside diameter. For line pipe with diameter D ≥ 1.422 [ m ] the diameter tolerance is to be agreed with the supplier.

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
  • dntype : Pipe OD Or Pipe ID
  • pipetype : Line Pipe Type
  • toltyped : Diameter Tolerance Type
    • Dfxu+ : User Defined Positive Diameter Fraction
    • Dfxu- : User Defined Negative Diameter Fraction
    • Dfau+ : User Defined Positive Diameter Allowance
    • Dfau- : User Defined Negative Diameter Allowance

Tool Output

  • D : Nominal Pipe Diameter
  • Dfa+ : Positive Diameter Allowance
  • Dfa- : Negative Diameter Allowance
  • Dfx+ : Positive Diameter Fraction
  • Dfx- : Negative Diameter Fraction
  • Dmax : Maximum Pipe Diameter
  • Dmin : Minimum Pipe Diameter
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tn : Nominal Wall Thickness
CALCULATOR : API 5L Annex J.6 Line Pipe Diameter Tolerance (Offshore) [FREE]   ±

Calculate offshore pipeline maximum and minimum diameter (API 5L annex J table J3).

Diameter tolerances may be calculated from either API 5L, user defined fraction / percentage, or user defined allowance. All tolerances should be entered as positive values.

For line pipe with diameter D < 0.0603 [ m] the out of roundness is included with the diameter tolerance. For line pipe with diameter D ≥ 0.2191 [ m ] the diameter tolerance may also be calculated from the inside diameter. For line pipe with diameter D ≥ 1.422 [ m ] the diameter tolerance is to be agreed with the supplier.

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
  • dntype : Pipe OD Or Pipe ID
  • pipetype : Line Pipe Type
  • toltyped : Diameter Tolerance Type
    • Dfxu+ : User Defined Positive Diameter Fraction
    • Dfxu- : User Defined Negative Diameter Fraction
    • Dfau+ : User Defined Positive Diameter Allowance
    • Dfau- : User Defined Negative Diameter Allowance

Tool Output

  • D : Nominal Pipe Diameter
  • Dfa+ : Positive Diameter Allowance
  • Dfa- : Negative Diameter Allowance
  • Dfx+ : Positive Diameter Fraction
  • Dfx- : Negative Diameter Fraction
  • Dmax : Maximum Pipe Diameter
  • Dmin : Minimum Pipe Diameter
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tn : Nominal Wall Thickness
CALCULATOR : Line Pipe Diameter Tolerance (General) [FREE]   ±

Calculate general pipeline maximum and minimum diameter from either user defined fraction / percentage tolerance, or user defined allowance. All tolerances should be entered as positive values.

For line pipe with diameter D < 0.0603 [ m ] the out of roundness is included with the diameter tolerance. For line pipe with diameter D ≥ 0.2191 [ m] the out of roundness may also be calculated from the inside 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
  • dntype : Pipe OD Or Pipe ID
  • toltyped : Diameter Tolerance Type
    • Dfxu+ : User Defined Positive Diameter Fraction
    • Dfxu- : User Defined Negative Diameter Fraction
    • Dfau+ : User Defined Positive Diameter Allowance
    • Dfau- : User Defined Negative Diameter Allowance

Tool Output

  • D : Nominal Pipe Diameter
  • Dfa+ : Positive Diameter Allowance
  • Dfa- : Negative Diameter Allowance
  • Dfx+ : Positive Diameter Fraction
  • Dfx- : Negative Diameter Fraction
  • Dmax : Maximum Pipe Diameter
  • Dmin : Minimum Pipe Diameter
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tn : Nominal Wall Thickness
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
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