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DNVGL ST F101 Submarine Pipeline Local Buckling

Calculate DNVGL-ST-F101 submarine pipeline local buckling checks for combined loading.

The load controlled calculators should only be used for elastic deformation (check that the equivalent stress is less than the yield stress).

The displacement controlled calculators can be used for compressive elastic and plastic deformation. Elastic strains are calculated using the elastic modulus, and should not be used in the plastic range. Plastic strains should be calculated using finite element analysis (FEA). Use the allowable stress design (ASD) calculators for displacement controlled loads which include torsion.

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

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Links : ±
CALCULATOR : DNVGL ST F101 Section 5.4.6 Subsea Pipeline Local Buckling Check Load Controlled Internal Over Pressure [PLUS]   ±

Calculate subsea pipeline local buckling check for load controlled internal overpressure (DNVGL-ST-F101 section 5.4.6).

The load controlled local buckling checks are not valid in the plastic range. Torsion is not included. For combined loads including torsion, use the ASD calculator.

Tool Input

  • plitype : Local Internal 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
  • ginctype : Incidental Pressure Factor Type
    • γincu : User Defined Incidental Pressure Factor
  • 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 : Operating 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
  • lattype : Lateral Point Load Type
    • Ru : User Defined Reaction Force From Point Load
  • sectype : Pipe Section Properties Type
    • Mpu : User Defined Plastic Bending Moment
    • Spu : User Defined Plastic Axial Load
    • Asu : User Defined Steel Cross Section Area
    • Zu : User Defined Pipe Z Modulus
  • gsctype : Safety Class Resistance Factor Type
    • γsclbu : User Defined Load Controlled Resistance Factor
  • optype : Characteristic Wall Thickness Type
  • ta : Corrosion Allowance
  • Msd : Design Bending Moment
  • Ssd : Design Axial Load

Tool Output

  • ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
  • ΔPl/Pb : Delta Pressure Over Burst Pressure Ratio
  • Δz : Local Elevation Relative To Reference Elevation
  • αc : Flow Stress Parameter
  • αu : Material Strength Factor
  • β : Diameter Ratio Parameter
  • γinc : Incidental Pressure Factor
  • γm : Material Resistance Factor
  • γp : Flow Stress Diameter Ratio Effect
  • γsclb : Load Controlled Resistance Factor
  • As : Steel Cross Section Area
  • CHK : Load Controlled Interaction Check (≤ 1)
  • D/t2 : Diameter Over t2 Ratio
  • Mp : Plastic Bending Moment
  • Msd/Mp : Design Moment Over Plastic Moment Ratio
  • Nsd : Design Wall Load
  • OD : Pipe Nominal Outside Diameter
  • Pb : Burst Pressure
  • Pd : Design Pressure At Reference Elevation
  • Ple : External Pressure At Local Elevation
  • Pli : Internal Pressure At Local Elevation
  • Pri : Incidental Pressure At Reference Elevation
  • SMTS : Specified Minimum Tensile Stress
  • SMYS : Specified Minimum Yield Stress
  • Sb : Bending Stress
  • Scb : Burst Stress
  • Se : Equivalent Stress
  • Se/fy : Equivalent Stress Over Yield Stress Ratio
  • Sh : Hoop Stress
  • Sp : Plastic Axial Load
  • Ssd/Sp : Design Load Over Plastic Load Ratio
  • Sx : Pipe Wall Axial Stress
  • Z : Pipe Z Modulus
  • fu : Ultimate Stress
  • fut : Ultimate Derating Stress
  • 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 5.4.6 Subsea Pipeline Local Buckling Check Load Controlled External Over Pressure [PLUS]   ±

Calculate subsea pipeline local buckling check for load controlled external overpressure (DNVGL-ST-F101 section 5.4.6).

The load controlled local buckling checks are not valid in the plastic range. Torsion is not included. For combined loads including torsion, use the ASD calculator.

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
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • syttype : Temperature Derating Type
    • Td : Operating 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
  • modptype : Pipe Material Type
    • νu : User Defined Pipe Poisson's Ratio
    • Eu : User Defined Pipe Elastic Modulus
  • lattype : Lateral Point Load Type
    • Ru : User Defined Reaction Force From Point Load
  • sectype : Pipe Section Properties Type
    • Mpu : User Defined Plastic Bending Moment
    • Spu : User Defined Plastic Axial Load
    • Asu : User Defined Steel Cross Section Area
    • Zu : User Defined Pipe Z Modulus
  • gsctype : Safety Class Resistance Factor Type
    • γsclbu : User Defined Load Controlled Resistance Factor
  • optype : Characteristic Wall Thickness Type
  • fabtype : Fabrication Factor Type
    • αfabu : User Defined Fabrication Factor
  • ta : Corrosion Allowance
  • fo : Pipe Ovality
  • Msd : Design Bending Moment
  • Ssd : Design Axial Load

Tool Output

  • ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
  • ΔPl/Pc : Local External Pressure Over Collapse Pressure Ratio (≤ 1)
  • αc : Flow Stress Parameter
  • αfab : Fabrication Factor
  • αu : Material Strength Factor
  • β : Diameter Ratio Parameter
  • γm : Material Resistance Factor
  • γsclb : Load Controlled Resistance Factor
  • ν : Pipe Poisson's Ratio
  • As : Steel Cross Section Area
  • CHK : Load Controlled Interaction Check (≤ 1)
  • D/t2 : Diameter Over t2 Ratio
  • E : Pipe Elastic Modulus
  • Mp : Plastic Bending Moment
  • Msd/Mp : Design Moment Over Plastic Moment Ratio
  • Nsd : Design Wall Load
  • OD : Pipe Nominal Outside Diameter
  • Pc : External Collapse Pressure
  • Pel : Elastic Collapse Pressure
  • Ple : External Pressure At Local Elevation
  • Pli : Internal Pressure At Local Elevation
  • Py : Plastic Collapse Pressure
  • SMTS : Specified Minimum Tensile Stress
  • SMYS : Specified Minimum Yield Stress
  • Sb : Bending Stress
  • Scb : Burst Stress
  • Se : Equivalent Stress
  • Se/fy : Equivalent Stress Over Yield Stress Ratio
  • Sh : Hoop Stress
  • Sp : Plastic Axial Load
  • Ssd/Sp : Design Load Over Plastic Load Ratio
  • Sx : Pipe Wall Axial Stress
  • Z : Steel Z Modulus
  • fu : Ultimate Stress
  • fut : Ultimate Derating Stress
  • 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 5.4.6 Subsea Pipeline Local Buckling Check Displacement Controlled Internal Over Pressure [PLUS]   ±

Calculate subsea pipeline local buckling check for displacement controlled internal overpressure (DNVGL-ST-F101 section 5.4.6).

The displacement controlled check is valid in both the elastic and plastic ranges. Strain values should be calculated using finite element analysis (FEA).

Tool Input

  • plitype : Local Internal 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
  • ginctype : Incidental Pressure Factor Type
    • γincu : User Defined Incidental Pressure Factor
  • 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
  • rortype : Maximum SMYS Over SMTS Ratio Type
    • Rto.5/Rmu : User Defined Maximum Rt0.5 Over Rm Ratio
  • syttype : Temperature Derating Type
    • Td : Operating 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
  • lattype : Lateral Point Load Type
    • Ru : User Defined Reaction Force From Point Load
  • ludertype : Luder Plateau Type
  • gsctype : Safety Class Resistance Factor Type
    • γscdcu : User Defined Displacement Controlled Resistance Factor
  • optype : Characteristic Wall Thickness Type
  • agwtype : Girth Weld Factor Type
    • αgwu : User Defined Girth Weld Factor
  • ta : Corrosion Allowance
  • εsd : Design Axial Strain

Tool Output

  • ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
  • ΔPl/Pb : Delta Pressure Over Burst Pressure Ratio
  • Δz : Local Elevation Relative To Reference Elevation
  • αgw : Girth Weld Factor
  • αh : SMYS Over SMTS Maximum Ratio
  • αu : Material Strength Factor
  • γinc : Incidental Pressure Factor
  • γscdc : Displacement Controlled Resistance Factor
  • εc : Collapse Strain
  • εrd : Design Resistance Strain
  • CHK : Displacement Controlled Interaction Check (≤ 1)
  • D/t2 : Diameter Over t2 Ratio
  • OD : Pipe Nominal Outside Diameter
  • Pb : Burst Pressure
  • Pd : Design Pressure At Reference Elevation
  • Ple : External Pressure At Local Elevation
  • Pli : Internal Pressure At Local Elevation
  • Pri : Incidental Pressure At Reference Elevation
  • SMTS : Specified Minimum Tensile Stress
  • SMYS : Specified Minimum Yield Stress
  • Scb : Burst Stress
  • fu : Ultimate Stress
  • fut : Ultimate Derating Stress
  • 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 5.4.6 Subsea Pipeline Local Buckling Check Displacement Controlled External Over Pressure [PLUS]   ±

Calculate subsea pipeline local buckling check for displacement controlled external overpressure (DNVGL-ST-F101 section 5.4.6).

The displacement controlled check is valid in both the elastic and plastic ranges. Strain values should be calculated using finite element analysis (FEA).

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
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • rortype : Maximum SMYS Over SMTS Ratio Type
    • Rto.5/Rmu : User Defined Maximum Rt0.5 Over Rm Ratio
  • syttype : Temperature Derating Type
    • Td : Operating 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
  • modptype : Pipe Material Type
    • νu : User Defined Pipe Poisson's Ratio
    • Eu : User Defined Pipe Elastic Modulus
  • lattype : Lateral Point Load Type
    • Ru : User Defined Reaction Force From Point Load
  • ludertype : Luder Plateau Type
  • gsctype : Safety Class Resistance Factor Type
    • γsclbu : User Defined Load Controlled Resistance Factor
    • γscdcu : User Defined Displacement Controlled Resistance Factor
  • optype : Characteristic Wall Thickness Type
  • fabtype : Fabrication Factor Type
    • αfabu : User Defined Fabrication Factor
  • agwtype : Girth Weld Factor Type
    • αgwu : User Defined Girth Weld Factor
  • ta : Corrosion Allowance
  • fo : Pipe Ovality
  • εsd : Design Axial Strain

Tool Output

  • ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
  • ΔPl/Pc : Local External Pressure Over Collapse Pressure Ratio (≤ 1)
  • αfab : Fabrication Factor
  • αgw : Girth Weld Factor
  • αh : SMYS Over SMTS Maximum Ratio
  • αu : Material Strength Factor
  • γm : Material Resistance Factor
  • γscdc : Displacement Controlled Resistance Factor
  • γsclb : Load Controlled Resistance Factor
  • εc : Collapse Strain
  • εrd : Design Resistance Strain
  • ν : Pipe Poisson's Ratio
  • CHK : Displacement Controlled Interaction Check (≤ 1)
  • D/t2 : Diameter Over t2 Ratio
  • E : Pipe Elastic Modulus
  • OD : Pipe Nominal Outside Diameter
  • Pc : External Collapse Pressure
  • Pel : Elastic Collapse Pressure
  • Ple : External Pressure At Local Elevation
  • Pli : Internal Pressure At Local Elevation
  • Py : Plastic Collapse Pressure
  • SMTS : Specified Minimum Tensile Stress
  • SMYS : Specified Minimum Yield Stress
  • Scb : Burst Stress
  • fu : Ultimate Stress
  • fut : Ultimate Derating Stress
  • 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 5.6.2 Subsea Pipeline Bend Allowable Stress Design (ASD) Equivalent Stress Check Internal Over Pressure [PLUS]   ±

Calculate subsea pipeline bend allowable stress design (ASD) equivalent stress check for internal overpressure (DNVGL-ST-F101 section 5.6.2).

The ASD check can be used for combined torsion, bending and axial load. The ASD checks are valid for displacement controlled loads only.

Tool Input

  • plitype : Local Internal 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
  • ginctype : Incidental Pressure Factor Type
    • γincu : User Defined Incidental Pressure Factor
  • 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
  • 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
  • optype : Characteristic Wall Thickness Type
  • sectype : Pipe Section Properties Type
    • Asu : User Defined Steel Cross Section Area
    • Iu : User Defined Pipe Bending Second Area Moment
    • Ju : User Defined Pipe Torsion Second Area Moment
  • gsctype : Safety Class Resistance Factor Type
    • ηeu : User Defined Equivalent Stress Usage Factor
  • ta : Corrosion Allowance
  • Tsd : Design Torsion Moment
  • Msd : Design Bending Moment
  • Ssd : Design Axial Load

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
  • ηe : Equivalent Stress Usage Factor
  • σb : Bending Stress
  • σe : Equivalent Stress
  • σh : Hoop Stress
  • σl : Longitudinal Stress
  • σw : Pipe Wall Axial Stress
  • τlh : Tangential Shear Stress
  • As : Steel Cross Section Area
  • CHK : Allowable Stress Design Check (≤ 1)
  • D/t2 : Diameter Over t2 Ratio
  • Is : Steel Bending Second Area Moment
  • Js : Steel Torsion Second Area Moment
  • Nsd : Design Wall Load
  • OD : Pipe Nominal Outside Diameter
  • Pd : Design Pressure At Reference Elevation
  • Ple : External Pressure At Local Elevation
  • Pli : Internal Pressure At Local Elevation
  • Pri : Incidental Pressure At Reference Elevation
  • SMYS : Specified Minimum Yield Stress
  • 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 5.6.2 Subsea Pipeline Bend Allowable Stress Design (ASD) Equivalent Stress Check External Over Pressure [PLUS]   ±

Calculate subsea pipeline bend allowable stress design (ASD) equivalent stress check for external overpressure (DNVGL-ST-F101 section 5.6.2).

The ASD check can be used for combined torsion, bending and axial load. The ASD checks are valid for displacement controlled loads only, and where the external collapse check is also met.

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
  • sectype : Pipe Section Properties Type
    • Asu : User Defined Steel Cross Section Area
    • Iu : User Defined Pipe Bending Second Area Moment
    • Ju : User Defined Pipe Torsion Second Area Moment
  • gsctype : Safety Class Resistance Factor Type
    • γscu : User Defined Safety Class Resistance Factor
    • ηeu : User Defined Equivalent Stress Usage Factor
  • optype : Characteristic Wall Thickness Type
  • fabtype : Pipe Type
    • αfabu : User Defined Fabrication Factor
  • ta : Corrosion Allowance
  • fo : Pipe Ovality
  • Tsd : Design Torsion Moment
  • Msd : Design Bending Moment
  • Ssd : Design Axial Load

Tool Output

  • ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
  • αfab : Fabrication Factor
  • αu : Material Strength Factor
  • γm : Material Resistance Factor
  • γsclb : Local Buckling Resistance Factor
  • ηe : Equivalent Stress Usage Factor
  • ν : Pipe Poisson's Ratio
  • σb : Bending Stress
  • σe : Equivalent Stress
  • σh : Hoop Stress
  • σl : Longitudinal Stress
  • σw : Pipe Wall Axial Stress
  • τlh : Tangential Shear Stress
  • As : Steel Cross Section Area
  • CHK-A : Allowable Stress Design Check (≤ 1)
  • CHK-C : Collapse Pressure Design Check (≤ 1)
  • D/t2 : Diameter Over t2 Ratio
  • E : Pipe Elastic Modulus
  • Is : Steel Bending Second Area Moment
  • Js : Steel Torsion Second Area Moment
  • Nsd : Design Wall Load
  • OD : Pipe Nominal Outside Diameter
  • Pc : External Collapse Pressure
  • Pca : Allowable External Pressure Colllapse Buckling
  • Pel : Elastic Collapse Pressure
  • Ple : External Pressure At Local Elevation
  • Pli : Internal Pressure At Local Elevation
  • Py : Plastic Collapse Pressure
  • SMYS : Specified Minimum Yield Stress
  • 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 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
CALCULATOR : DNVGL ST F101 Section 4.7.3 Subsea Pipeline Design Load Effect [FREE]   ±

Calculate subsea pipeline load effect combinations for ultimate limit state (ULS), fatigue limit state (FLS), and accident limit state (ALS) (DNVGL-ST-F101 section 4.7.3 table 4-4 and 4-5). Use the Result Table option to display all load effect combinations.

Tool Input

  • gctype : Condition Load Effect Factor Type
    • γcu : User Defined Condition Load Effect Factor
  • gletype : Load Check Type
    • γfu : User Defined Functional Load Factor
    • γeu : User Defined Environmental Load Factor
    • γiu : User Defined Interference Load Factor
    • γau : User Defined Accidental Load Factor
  • M : Bending Loads
  • S : Axial Loads
  • ε : Axial Strain

Tool Output

  • γa : Accidental Load Factor
  • γc : Condition Load Effect Factor
  • γe : Environmental Load Factor
  • γf : Functional Load Factor
  • γi : Interference Load Factor
  • εsd : Design Axial Strain
  • Msd : Design Bending Moment
  • Ssd : Design Axial Load
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