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DNVGL ST F101 Submarine Pipeline Wall Thickness

Calculate DNVGL-ST-F101 submarine pipeline wall thickness from local incidental pressure.

Local incidental pressure can be calculated from the design pressure, calculated from the reference incidental pressure, or can be user defined. External pressure should be calculated for the minimum local water depth. The pipeline wall thickness must be calculated for the maximum pressure differential at all points on the pipeline or pipeline section. For submarine pipelines where the internal fluid density is less than the external fluid density, the maximum pressure differential occurs at the highest submerged location for the pipeline or pipeline section. For the platform zone the highest differential pressure occurs at the riser splash zone. Use the Result Plot option to plot the required wall thickness versus elevation.

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

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CALCULATOR : DNVGL ST F101 Section 5.4.2 Subsea Pipeline Wall Thickness From Pressure And Elevation [FREE]   ±

Calculate subsea pipeline wall thickness from incidental pressure and elevation (DNVGL-ST-F101 section 5.4.2).

The external pressure should be calculated using the lowest astronomical tide (LAT), minus storm surge. The most onerous combination of local incidental pressure and external pressure should be used. This normally corresponds to the highest elevation for each section. The wall thickness should be calculated separately for each section with a different safety class. The pipe wall thickness may also be affected by minimum wall thickness requirements (see Table 5-6).

The wall thickness should be checked for all points on the pipeline section. Use the Result Plot option to plot the required wall thickness from minimum to maximum local elevation. The selected wall thickness should be greater than or equal to the maximum required wall thickness. Use the Result Plot option to check the hoop stress for the selected wall thickness from minimum to maximum local elevation.

Tool Input

  • plitype : Local Incidental Pressure Type
    • Prdu : User Defined Design Pressure At Reference Elevation
    • Priu : User Defined Incidental Pressure At Reference Elevation
    • Pliu : User Defined Incidental Pressure At Local Elevation
    • ρf : Operating Fluid Density
    • Zr : Reference Elevation
    • Zl : Local Elevation
  • pletype : Local External Pressure Type
    • Pleu : User Defined Local External Pressure
    • ρe : External Fluid Density
    • Zs : Surface Elevation
  • syutype : Stress Table Type
  • mattype : Material Strength Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • syttype : Temperature Derating Type
    • Td : Design Temperature
    • fytu : User Defined Yield Stress Temperature Derating
    • futu : User Defined Ultimate 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
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • ginctype : Incidental Pressure Factor Type
    • γincu : User Defined Incidental Pressure Factor
  • gsctype : Safety Class Resistance Factor Type
    • γscu : User Defined Safety Class Resistance Factor
  • walltype : Wall Thickness Calculation Type
  • ta : Corrosion Allowance

Tool Output

  • ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
  • Δz : Local Elevation Relative To Reference Elevation
  • αu : Material Strength Factor
  • γinc : Incidental Pressure Factor
  • γm : Material Resistance Factor
  • γsc : Safety Class Resistance Factor
  • ID : Pipe Nominal Inside Diameter
  • OD : Pipe Nominal Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • PR : Pipe Rated Pressure
  • Pb : Pipe Burst Pressure
  • Ple : External Pressure At Local Elevation
  • Pli : Incidental Pressure At Local Elevation
  • Prd : Design Pressure At Reference Elevation
  • Pri : Incidental Pressure At Reference Elevation
  • SMTS : Specified Minimum Tensile Stress
  • SMYS : Specified Minimum Yield Stress
  • cvg : Convergence Check
  • fca : Allowable Hoop Stress
  • fcb : Burst Stress
  • fh : Pipe Hoop Stress
  • fh/fca : Hoop Stress Over Allowable Stress Ratio
  • fu : Ultimate Stress
  • fut : Ultimate Derating Stress
  • fy : Yield Stress
  • fyt : Yield Derating Stress
  • t : Pipe Pressure Design Wall Thickness
  • tf : Fabrication Allowance
  • tfx : Fabrication Fraction
  • tm : Pipe Minimum Wall Thickness
  • tn : Pipe Nominal Wall Thickness
  • wd : Water Depth At Local Elevation

CALCULATOR : DNVGL ST F101 Subsea Pipeline Wall Thickness From Hoop Stress (General) [FREE]   ±

Calculate DNVGL-ST-F101 subsea pipeline general wall thickness from diameter, wall thickness tolerance and design stress.

For DNVGL-ST-F101 subsea pipelines use the Barlows thin wall equation for mid wall diameter option. Wall thickness tolerance can be defined by either a fraction tolerance, or an allowance tolerance. All tolerances should be positive. The corrosion allowance should include mechanical allowance (eg threads), erosion allowance and any other allowances.

Tool Input

  • pletype : External Pressure Type
    • Peu : User Defined External Pressure
  • 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
  • syutype : Stress Table Type
  • mattype : Yield Stress Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • sdtype : Design Stress Type (F x SMYS)
    • Fu : User Defined Design Factor
    • Sdu : User Defined Design Stress
  • walltype : Wall Thickness Calculation Type
    • Yu : User Defined ASME Y Factor
  • calctype : Wall Thickness Type
  • tc : Corrosion Allowance
  • Pi : Internal Pressure

Tool Output

  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • PΔ : Pressure Difference
  • Pe : External Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sd : Design Stress
  • Sh : Pipe Hoop Stress
  • Sh/Sd : Hoop Stress Over Design Stress Ratio
  • cvg : Convergence Check
  • tf : Fabrication Allowance
  • tfx : Fabrication Fraction
  • th : Hoop Stress Thickness (Pressure Containment)
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness
CALCULATOR : DNVGL ST F101 Section 5.3.3 Subsea Pipeline Derated Yield Stress And Tensile Stress From Temperature [FREE]   ±

Calculate subsea pipeline temperature derating stress from temperature (DNVGL-ST-F101 section 5.3.3 Figure 5-2).

The derating stress is valid for temperatures up to 200 degrees C. For temperatures above 200 C material tests should be performed. For low temperature pipelines fracture toughness should also be considered.

Use the Result Table option to display a table of derated yield stress versus material type at the design temperature. Use the Result Plot option to display a plot of derated yield stress versus temperature for duplex stainless 22Cr 25Cr, and carbon manganese steel 13Cr curves.

Tool Input

  • syutype : Stress Table Type
  • mattype : Material Strength Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • syttype : Temperature Derating Type
    • fytu : User Defined Yield Stress Temperature Derating
    • futu : User Defined Ultimate Stress Temperature Derating
  • autype : Material Strength Factor Type
  • Td : Design Temperature

Tool Output

  • αu : Material Strength Factor
  • SMTS : Specified Minimum Tensile Stress
  • SMYS : Specified Minimum Yield Stress
  • fcb : Burst Stress
  • fu : Tensile Stress
  • fut : Temperature Derating Tensile Stress
  • fy : Yield Stress
  • fyt : Temperature Derating Yield Stress
CALCULATOR : DNVGL ST F101 Subsea Pipeline Diameter And Wall Thickness Schedule [FREE]   ±

Calculate DNVGL-ST-F101 subsea pipeline diameter and pressure design wall thickness from pipe schedule.

The pressure design thickness equals the nominal wall thickness minus the corrosion allowance and fabrication allowance. The minimum wall thickness equals the nominal wall thickness minus the fabrication allowance. The corrosion allowance includes mechanical allowances such as threads and damage etc. Use the Result Table option display a table of pressure design wall thickness versus wall thickness for the selected diameter schedule.

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
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