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API 5L Line Pipe Out Of Roundness Tolerance

Calculate API 5L line pipe out of roundness and ovality from diameter and tolerance.

Out of roundness is equal to the maximum diameter minus the minimum diameter measured at the same cross section. Out of roundness ratio equals the out of roundness divided by either the nominal diameter or the mean diameter. DNV or ISO ovality is equal to the out of roundness ratio. API ovality is equal to half the DNV ovality (DNV or ISO ovality is equal to 2 x API ovality).

`Davg = (Dmax + Dmin) / 2 `
`OOR = (Dmax - Dmin) `
`ro = (OOR) / (Davg) `
`fa = (Dmax - Dmin) / (Dmax + Dmin) = (OOR) / (2.Davg) = (ro) / 2 `
`fd = 2.(Dmax - Dmin) / (Dmax + Dmin) = (OOR) / (Davg) = 2.fa = ro `

where :

OOR = out of roundness
ro = out of roundness ratio
Dmax = maximum diameter
Dmin = minimum diameter
Davg = average or mean diameter
fa = API ovality
fd = DNVGL or ISO ovality

Out of roundness can be calculated from API 5L, from user defined out of roundness, or from user defined maximum and minimum diameter. For diameter D ≥ 0.2191 m, the out of roundness can be calculated from the inside diameter. For D < 0.0603 m the out of roundness is included with the diameter tolerance. For D ≥ 1.422 m the out of roundness tolerance is to be agreed with the supplier. All tolerances should be entered as positive (+ve) values.

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

Calculate onshore pipeline out of roundness and ovality (API 5L section 9.11 table 10).

Out of roundness is the difference between the maximum and minimum diameter of the pipe. DNV ovality is equal to 2 x API ovality. 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. For line pipe with diameter D ≥ 1.422 [ m ] the out of roundness 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 : Out Of Roundness Tolerance Type
    • Dxu : User Defined Out Of Roundness Ratio
    • Dau : User Defined Out Of Roundness
    • Dmaxu : User Defined Maximum Diameter
    • Dminu : User Defined Minimum Diameter

Tool Output

  • D : Nominal Pipe Diameter
  • D/tn : Diameter Over Wall Thickness Ratio
  • Dmax : Maximum Diameter
  • Dmin : Minimum Diameter
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OOR : Pipe Out Of Roundness
  • fapi : API Ovality
  • fdnv : Out Of Roundness Ratio And DNV Ovality
  • tn : Nominal Wall Thickness

CALCULATOR : API 5L Annex J.6 Line Pipe Out Of Roundness Tolerance (Offshore) [FREE]   ±

Calculate offshore pipeline out of roundness and ovality (API 5L annex J table J3).

Out of roundness is the difference between the maximum and minimum diameter of the pipe. DNV ovality is equal to 2 x API ovality. 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. For line pipe with diameter D ≥ 1.422 [ m ] the out of roundness 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 : Out Of Roundness Tolerance Type
    • Dxu : User Defined Out Of Roundness Ratio
    • Dau : User Defined Out Of Roundness
    • Dmaxu : User Defined Maximum Diameter
    • Dminu : User Defined Minimum Diameter

Tool Output

  • D : Nominal Pipe Diameter
  • D/tn : Diameter Over Wall Thickness Ratio
  • Dmax : Maximum Diameter
  • Dmin : Minimum Diameter
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OOR : Out Of Roundness
  • fapi : API Ovality
  • fdnv : Out Of Roundness Ratio And DNV Ovality
  • tn : Nominal Wall Thickness

CALCULATOR : Line Pipe Out Of Roundness Tolerance (General) [FREE]   ±

Calculate general pipeline out of roundness and ovality.

Out of roundness is the difference between the maximum and minimum diameter of the pipe. DNV ovality is equal to 2 x API ovality. All tolerances should be entered as positive values.

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 : Out Of Roundness Tolerance Type
    • Dxu : User Defined Out Of Roundness Ratio
    • Dau : User Defined Out Of Roundness
    • Dmaxu : User Defined Maximum Diameter
    • Dminu : User Defined Minimum Diameter

Tool Output

  • D : Nominal Pipe Diameter
  • D/tn : Diameter Over Wall Thickness Ratio
  • Dmax : Maximum Diameter
  • Dmin : Minimum Diameter
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OOR : Out Of Roundness
  • fapi : API Ovality
  • fdnv : Out Of Roundness Ratio And DNV Ovality
  • tn : Nominal Wall Thickness

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