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DNVGL ST F101 Submarine Pipeline Ovality

Calculate DNVGL-ST-F101 submarine pipeline ovality from the out of roundness tolerance, or measured maximum and minimum diameter. Pipe ovalisation can be calculated from the initial ovality and the bending strain.

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

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CALCULATOR : DNVGL ST F101 Section 13.4.11 Subsea Pipeline Ovalisation From Bending Strain [PLUS]   ±

Calculate subsea pipeline ovalisation from initial ovality and bending strain (DNVGL-ST-F101 section 13.4.11).

Ovalisation is calculated from wall thickness t2, for local checks.

Tool Input

  • pletype : Local External Pressure Type
    • Pleu : User Defined Local External Pressure
    • ρe : External Fluid Density
    • Zs : Surface Elevation
    • Zl : Local Elevation
  • plitype : Local Internal Pressure Type
    • Pliu : User Defined Internal Pressure At Local Elevation
  • syutype : Stress Table Type
  • mattype : Material Strength Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • syttype : Temperature Derating Type
    • Td : Operating Temperature
    • fytu : User Defined Yield Stress Temperature Derating
  • autype : Material Strength Factor Type
  • 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
  • modptype : Pipe Material Type
    • νu : User Defined Pipe Poisson's Ratio
    • Eu : User Defined Pipe Elastic Modulus
  • optype : Characteristic Wall Thickness Type
  • fabtype : Fabrication Factor Type
    • αfabu : User Defined Fabrication Factor
  • ta : Corrosion Allowance
  • fo : Pipe Ovality
  • εc : Design Bending Strain

Tool Output

  • ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
  • αfab : Fabrication Factor
  • αu : Material Strength Factor
  • ν : Pipe Poisson's Ratio
  • E : Pipe Elastic Modulus
  • OD : Pipe Nominal Outside Diameter
  • OD/t2 : Diameter Over Wall Thickness Ratio
  • Pc : External Collapse Pressure
  • Pel : Elastic Collapse Pressure
  • Ple : External Pressure At Local Elevation
  • Ple/Pc : Local External Pressure Over Collapse Pressure Ratio (≤ 1)
  • Pli : Internal Pressure At Local Elevation
  • Py : Plastic Collapse Pressure
  • SMYS : Specified Minimum Yield Stress
  • fo' : Pipe Ovality Due To Bending
  • fy : Yield Stress
  • fyt : Yield Derating Stress
  • t2 : Wall Thickness t2
  • tn : Pipe Nominal Wall Thickness
  • wd : Water Depth At Local Elevation

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

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