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DNVGL ST F101 Submarine Pipeline Tolerances

Calculate DNVGL-ST-F101 submarine pipeline out of roundness tolerance, diameter tolerance, and wall thickness tolerance.

Reference : DNVGL-ST-F101 : Submarine Pipeline Systems (Download from the DNVGL website)

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CALCULATOR : DNVGL ST F101 Section 7.7.2 Subsea Pipeline Out Of Roundness And Ovality [FREE]   ±

Calculate subsea pipeline out of roundness and ovality (DNVGL-ST-F101 section 7.7.2 table 7-19). Tolerances can either be specified from table 7-19, user defined fraction / percentage tolerance, user defined allowance, or calculated from user defined or measured maximum and minimum diameter. All tolerances should be entered as positive values. For pipe diameters over 1.422 m, tolerances are as agreed with the supplier.

Tool Input

  • 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
  • pipetype : Pipe Location Type
  • dtoltype : Out Of Roundness Type
    • Dxu : User Defined Out Of Roundness Fraction
    • Dau : User Defined Out Of Roundness Allowance
    • Dmaxu : User Defined Maximum Diameter
    • Dminu : User Defined Minimum Diameter

Tool Output

  • OD : Pipe Nominal Outside Diameter
  • OOR : Out Of Roundness
  • fo : Ovality Ratio
  • tn : Pipe Nominal Wall Thickness

CALCULATOR : DNVGL ST F101 Section 5.3.4 Subsea Pipeline Characteristic Wall Thickness [FREE]   ±

Calculate subsea pipeline characteristic wall thickness t1 and t2 (DNVGL-ST-F101 section 5.3.4 table 5-5). Generally thickness t1 is used for pressure containment and system checks, and thickness t2 is used for other checks. The fabrication tolerance can be specified as either a wall thickness fraction, or as a wall thickness allowance.

Tool Input

  • 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
  • optype : Operation Type
  • ta : Corrosion Allowance

Tool Output

  • ID : Pipe Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • t1 : Wall Thickness
  • t2 : Wall Thickness
  • tf : Fabrication Allowance
  • tn : Nominal Wall Thickness
CALCULATOR : DNVGL ST F101 Section 7.7.3 Subsea Pipeline Maximum And Minimum Diameter And Tolerance [FREE]   ±

Calculate subsea pipeline diameter tolerance (DNVGL-ST-F101 section 7.3.3 table 7-17 and 7-18). Tolerances can either be calculated from tables 7-17 and 7-18, or by user defined fraction / percentage tolerance, or user defined allowance. All user defined tolerances should be entered as positive values. For pipe diameters over 1.422 m, tolerances are as agreed with the supplier.

Tool Input

  • 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
  • pipetype : Pipe Location Type
  • dtoltype : Diameter Tolerance Type
    • Dxu± : User Defined ± Diameter Fraction
    • Dau± : User Defined ± Diameter Allowance

Tool Output

  • Da± : ± Diameter Allowance
  • Dmax : Maximum Outside Diameter
  • Dmin : Minimum Outside Diameter
  • Dx± : ± Diameter Fraction
  • ID : Pipe Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • tn : Pipe Nominal Wall Thickness
CALCULATOR : DNVGL ST F101 Section 7.7.3 Subsea Pipeline Maximum And Minimum Wall Thickness And Tolerance [FREE]   ±

Calculate subsea pipeline wall thickness tolerance (DNVGL-ST-F101 section 7.7.3 table 7-20 and 7-21). Tolerances can either be calculated from tables 7-20 and 7-21, or by user defined fraction / percentage tolerance, or user defined allowance. All user defined tolerances should be entered as positive values.

Tool Input

  • 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
    • tfxu+ : User Defined Positive Wall Thickness Fraction
    • tfxu- : User Defined Negative Wall Thickness Fraction
    • tfau+ : User Defined Positive Wall Thickness Allowance
    • tfau- : User Defined Negative Wall Thickness Allowance

Tool Output

  • ID : Pipe Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • tfa+ : Positive Wall Thickness Allowance
  • tfa- : Negative Wall Thickness Allowance
  • tfx+ : Positive Wall Thickness Fraction
  • tfx- : Negative Wall Thickness Fraction
  • tmax : Maximum Wall Thickness
  • tmin : Minimum Wall Thickness
  • tn : Nominal Wall Thickness
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