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DNVGL Pipeline Modules

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Line Pipe Schedule   ±

Calculate DNVGL-ST-F101 subsea pipeline schedules for diameter, wall thickness, mass, weight, and stress.

Use the Result Table option to display schedule tables. Refer to the links below for other options.

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

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CALCULATOR MODULE : 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 MODULE : DNVGL ST F101 Submarine Pipeline Hydrotest Pressure   ±

Calculate DNVGL-ST-F101 submarine pipeline system test pressure and mill test pressure.

The system test pressure is calculated from the local incidental pressure. The required system test pressure and mill test pressure should be calculated for all points on the pipeline or pipeline section. Use the Result Plot option to plot the test pressure and hoop stress from minimum to maximum elevation.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Collapse Pressure   ±

Calculate DNVGL-ST-F101 submarine pipeline external collapse pressure and propagating buckle pressure.

The external pressure should be calculated for the maximum water depth. Propagating buckles are only a problem if collapse has occurred. Buckle arrestors may be required to minimse the risk of propagating buckling.

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

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CALCULATOR MODULE : 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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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Bend Allowable Stress Design (ASD)   ±

Calculate DNVGL-ST-F101 submarine pipeline allowable stress design (ASAD) check for combined loading. The allowable stress design (ASD) check can be used for pipeline induction bends with combined loading which includes a torsion load. The allowable stress design (ASD) check is a von Mises equivalent stress check.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Axial Load   ±

Calculate DNVGL-ST-F101 submarine pipeline axial load from temperature and pressure. The axial load calculations are valid in the elastic range only (check that the equivalent stress is less than the yield stress). The calculators include a combined load controlled check, displacement controlled check, allowable stress design check (ASD), and an equivalent stress check (von Mises).

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

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CALCULATOR MODULE : 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 MODULE : DNVGL ST F101 Submarine Pipeline Temperature Derating   ±

Calculate DNVGL-ST-F101 submarine pipeline temperature derating stress from temperature.

Derating is valid for temperatures up to 200 C. Material specific test data should be used if it is available. For low temperature pipelines, fracture toughness should also be considered.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Incidental Pressure   ±

Calculate DNVGL-ST-F101 submarine pipeline incidental pressure from design pressure and elevation.

The reference incidental pressure (the incidental pressure at the reference elvation) is calculated from the design pressure at the reference elevation. The local incidental pressure (the incidental pressure at the local elvation) is calculated from the reference incidental pressure and the relative elevation. Use the Result Plot option to plot local pressure and reference pressure versus elevation.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Flotation   ±

Calculate DNVGL-ST-F101 submarine pipeline flotation and vertical stability.

Select either the empty pipe or full pipe option. For vertical stability, the pipe specific gravity should be greater than or equal to 1.1.

The number of pipe internal and external layers, and the names of the layers can be changed on the setup page. The first internal layer is the line pipe. The line pipe wall thickness can either be selected from the pipe schedule, or the input value is used as the user defined value.

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

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CALCULATOR MODULE : 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 MODULE : DNVGL ST F101 Submarine Pipeline Hoop Stress   ±

Calculate DNVGL-ST-F101 submarine pipeline hoop stress from local incidental pressure.

The local incidental pressure can either be calculated, or user defined. For temporary conditions the actual local pressure can be used (eg for system pressure test). External pressure should be calculated for the minimum local water depth (lowest astronomical tide minus storm surge). For temporary conditions storm surge can be ignored. For pressure containment use wall thickness t1. For other cases use wall thickness t2.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Carbon Equivalent   ±

Calculate DNVGL-ST-F101 submarine pipeline carbon equivalent from material composition. Carbon equivalent is a useful indicator of weldability, and fracture toughness.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Dent Depth   ±

Calculate DNVGL-ST-F101 maximum allowable dent depth.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Design Pressure And Burst Pressure   ±

Calculate DNVGL-ST-F101 submarine pipeline maximum allowable design pressure and burst pressure from the pressure design wall thickness (nominal wall thickness minus fabrication allowance and corrosion allowance).

For platform piping the allowable pressure is the maximum allowable local incidental pressure. For subsea pipelines the allowable pressure is the maximum allowable local pressure difference (local incidental pressure minus local external pressure). Use the Result Table option to display the results for the selected pipe schedule and pipe diameter.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Transition Length At Code Break   ±

Calculate DNVGL-ST-F101 submarine pipeline transition length at code breaks.

The minimum transition length for pipeline components at a code break is four times the elastic length.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Design Load Effect   ±

Calculate DNVGL-ST-F101 submarine pipeline design load effect.

The design load effect can be calculated for ultimate limit state (ULS), fatigue limit state (FLS), and accident limit state (ALS). The ULS type a check is only required for system loads.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Expansion Spool   ±

Calculate DNVGL-ST-F101 submarine expansion spool local buckling and fatigue check.

The expansion spool is modelled as a simple beam with fixed ends, with a uniform distributed load due to friction and a lateral displacement at one end due to expansion. Pipe cross section properties are calculated for a single pipe layer with no coatings. For pipes with internal liner or external coatings use the user defined cross section properties option.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Mass And Weight   ±

Calculate DNVGL-ST-F101 subsea pipeline unit mass (mass per length), and total mass from length.

The mass per joint can be calculated from the joint length. Construction quantities can be calculated from the total pipe length. Pipe unit mass (mass per length) and pipe unit weight (weight per length) can be calculated for multi layer pipelines (dry empty, dry full, wet empty and wet full pipelines). For multi layer pipelines, the first internal layer is the line pipe. Change the number of layers on the setup page.

Use the Result Table option to display a table of pipe mass and weight versus schedule wall thickness for the selected diameter.

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Fluid Mass And Volume   ±

Calculate DNVGL-ST-F101 subsea pipeline fluid volume and mass for two phase gas and liquid, and three phase oil, water and gas (black oil).

The two phase fluid calculator can be used for single phase gas, single phase liquid, or two phase gas and liquid. The three phase black oil calculator can be used for single phase oil, single phase water, two phase oil and water, and three phase oil, water and gas. Water cut is the volume fraction of water in the liquid phase (ignoring the gas phase). Gas oil ratio (GOR) is the ratio of gas moles to liquid volume (ignoring the water phase). Gas moles are commonly measured as gas volume at standard conditions, eg SCM (Standard Conditions Meter) or SCF (Standard Conditions Feet).

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

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Fluid Velocity And Flowrate   ±

Calculate DNVGL-ST-F101 subsea pipeline fluid velocity and flowrate for two phase gas and liquid, and three phase oil, water and gas (black oil).

The two phase fluid calculator can be used for single phase gas, single phase liquid, or two phase gas and liquid. The three phase black oil calculator can be used for single phase oil, single phase water, two phase oil and water, and three phase oil, water and gas. Water cut is the volume fraction of water in the liquid phase (ignoring the gas phase). Gas oil ratio (GOR) is the ratio of gas moles to liquid volume (ignoring the water phase). Gas moles are commonly measured as gas volume at standard conditions, eg SCM (Standard Conditions Meter) or SCF (Standard Conditions Feet).

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

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CALCULATOR MODULE : DNVGL RP F101 Corrosion Line Pipe Schedule   ±

Calculate DNVGL-RP-F101 pipeline diameter and wall thickness schedule for corrosion.

The minimum wall thickness equals the nominal wall thickness minus the fabrication allowance. The pressure containment wall thickness equals the nominal wall thickness minus the fabrication allowance, and minus the corrosion allowance. Fabrication tolerance can be defined by either a fabrication allowance, or a fabrication fraction. The pipe diameter can be defined by either the outside diameter or the inside diameter. Use the Result Table option to display a table of pipe wall thickness versus schedule wall thickness for the selected diameter.

The pipe diameter can also be calculated from the measured circumference. Measuring the circumference is often the most convenient way to measure the pipe diameter.

Reference : DNVGL-RP-F101 : Corroded Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP-F101 Single Corrosion Defect   ±

Calculate DNVGL RP F101 allowable pressure for single corrosion defects.

Allowable pressure can be calculated for pressure load only for single longitudinal defects. For circumferential defects, or defects with compressive axial load use the combined pressure and compression load calculator. For circumferential defects the defect width is greater than the defect length. The allowable pressure can be calculated using either the calibrated safety factor (CSF) in section 3, or allowable stress design (ASD) in section 4. The system effect factor accounts for the measurement uncertainty when there are multiple defects of a similar size.

Reference : DNVGL-RP-F101 : Corroded Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F101 Interacting Corrosion Defect   ±

Calculate DNVGL RP F101 allowable pressure for interacting corrosion defects with internal pressure load only.

Single defects which are closer together than the minimum defect spacing should be treated as interacting defects. The allowable pressure can be calculated using either the calibrated safety factor (CSF) in section 3, or allowable stress design (ASD) in section 4. The system effect factor accounts for the measurement uncertainty when there are multiple defects of a similar size. Use the Result Plot option to plot the dimesionless defect (1-d/t versus X/L), and the critical defect. The results for each n, m, combination are tabled at the bottom of the page.

Reference : DNVGL-RP-F101 : Corroded Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F101 Complex Corrosion Defect   ±

Calculate DNVGL RP F101 allowable pressure for complex corrosion defects with internal pressure load only.

The defect should be entered as a "river bottom" profile, with the maximum depth at each cross section. The pressure resistance can be calculated for either calibrated safety factor (CSF), or allowable stress design (ASD). The system effect factor accounts for the measurement uncertainty when there are multiple defects of a similar size. Use the Result Plot option to plot the dimesionless defect (1-d/t versus X/L), and the critical defect. The results for each depth increment are tabled at the bottom of the page.

Reference : DNVGL-RP-F101 : Corroded Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F101 Maximum Defect Depth   ±
CALCULATOR MODULE : DNVGL RP F101 Temperature Derating   ±

Calculate DNVGL RP F101 yield stress and ultimate stress temperature derating from temperature.

The derating stress is calculated in accordance with DNV OS F101 submarine pipeline systems. The derating stress is valid for temperatures less than or equal to 200 degrees C. Material tests should be performed for operating temperatures above 200 C.

Reference : DNVGL-RP-F101 : Corroded Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F101 Local Incident Pressure   ±

Calculate DNVGL RP F101 local incident pressure and local external pressure from design pressure and elevation.

The local incident pressure is calculated from the design pressure and the elevation. Fluid density is assumed constant. Use the Result Plot option to plot local pressure and reference pressure versus elevation.

Reference : DNVGL-RP-F101 : Corroded Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F101 Pipeline Longitudinal Stress   ±

Calculate DNVGL RP F101 pipeline longitudinal stress from axial stress and bending stress.

The longitudinal stress is calculated from the nominal diameter and wall thickness. The axial stress can either be calculated from the pipeline temperature and pressure, or user defined.

Reference : DNVGL-RP-F101 : Corroded Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP O501 Erosion Rate   ±
CALCULATOR MODULE : DNVGL RP O501 Pipeline Erosion Rate   ±
CALCULATOR MODULE : DNVGL RP O501 Pipeline Bend Erosion Rate   ±
CALCULATOR MODULE : DNVGL RP O501 Pipeline Tee Erosion Rate   ±
CALCULATOR MODULE : DNVGL RP O501 Pipeline Reducer Erosion Rate   ±
CALCULATOR MODULE : DNVGL RP O501 Flexible Pipeline Erosion Rate   ±
CALCULATOR MODULE : DNVGL RP O501 Pipeline Fluid Velocity   ±

Calculate DNVGL RP O501 pipeline fluid velocity for single phase gas, single phase liquid, two phase gas liquid, or three phase black oil (gas, oil and water).

Gas oil ratio (GOR) is the ratio of gas moles over oil volume. Gas moles are commonly measured as gas volume at standard conditions (eg SCF or SCM). Water cut is measured relative to the total liquid volume (gas volume is ignored).

Liquid density can be calculated from degrees Baume, degrees Twaddell, or degrees API. For liquids lighter than or equal to water the density can be defined as degrees API, or degrees Baume (Be-). For liquids heavier than water the density can be defined by degrees Baume (Be+), or degrees Twaddell.

Gas density can be calculated from gas specific gravity, or gas molar mass. Gas molar mass is approximately equal to the molar mass of dry air times the gas specific gravity at standard conditions (for most gases the compressibility factor Z is approximately equal to 1 at standard conditions). The molar mass of dry air is taken as 28.964 kg/kg-mole. For gas mixtures, gas specific gravity is easier to measure than the molar mass.

Reference : DNVGL-RP-O501 Managing Sand Production And Erosion : formerly DNV-RP-O501 (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP O501 Pipeline And Sand Property   ±
CALCULATOR MODULE : DNVGL RP F115 Pipeline Pre Commissioning   ±
CALCULATOR MODULE : DNVGL RP F115 Pipeline Test Pressure   ±

Calculate DNVGL RP-F115 pipeline test pressure from design pressure and elevation.

The system test pressure is calculated from the local incidental pressure. The required system test pressure and mill test pressure should be calculated for all points on the pipeline or pipeline section. Use the Result Plot option to plot the test pressure and hoop stress from minimum to maximum elevation.

Reference : DNVGL-RP-F115 Pre-commissioning of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F115 Pipeline Pressure Response   ±
CALCULATOR MODULE : DNVGL RP F115 Pipeline Leak Rate   ±
CALCULATOR MODULE : DNVGL RP F115 Pipeline Chemical Dose Rate   ±
CALCULATOR MODULE : DNVGL RP F115 Pipeline Temperature Correction   ±
CALCULATOR MODULE : DNVGL RP F115 Pipeline Tidal Correction   ±
CALCULATOR MODULE : DNVGL RP F115 Pipeline Local Pressure   ±

Calculate DNVGL RP-F115 pipeline local stationary internal and external pressure from elevation.

The external pressure is calculated from the water depth. The internal fluid density is assumed constant. Elevation is measured relative to any arbitrary datum (+ve above the datum -ve below the datum). Use the Result Plot option to plot pressure versus elevation.

Reference : DNVGL-RP-F115 Pre-commissioning of Submarine Pipelines (Download from the DNVGL website)

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Related Modules :

CALCULATOR MODULE : DNVGL RP F115 Pipeline Test Fluid Volume   ±
CALCULATOR MODULE : DNVGL RP C203 Pipeline Fatigue Stress   ±
CALCULATOR MODULE : DNVGL RP C203 Fatigue Stress Amplitude   ±
CALCULATOR MODULE : DNVGL RP C203 Tubular Fatigue Stress   ±
CALCULATOR MODULE : DNVGL RP F109 Submarine Pipeline Stability   ±

Calculate DNVGL-RP-F109 pipeline lateral and vertical stability.

Static or absolute stability can be calculated for clay seabed, sandy seabed (D50 ≤ 50 mm), or rocky seabed (D50 > 50 mm). The single oscillation velocity corresponds to the maximum wave velocity in the return period. Maximum current velocity data should be used.

Dynamic stability can be calculated on clay and sandy seabeds for Lstable (pipe displacement ≤ 0.5 OOD), L10 (pipe displacement ≤ 0.5 OOD), or user defined pipe displacement. Significant current velocity data should be used.

Seabed wave velocity is calculated from the JONSWAP surface spectrum with an Airy wave transfer function. The calculation should only be used for elevations at or near the seabed. The Airy wave transform may not be valid in shallow water.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Shields Number   ±

Calculate DNVGL RP-F109 Shields number and critical velocity.

Shields number is the ratio of shear force to weight force and is used to estimate the onset of seabed movement for non cohesive soils. The critical velocity corresponds to to the onset of seabed movement.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Initial Seabed Penetration   ±

Calculate DNVGL RP-F109 initial pipeline penetration due to weight on sand and clay soils.

Penetration should be calculated for the maximum pipe weight, normally the water filled weight during pre commissioning. Pipe penetration or embedment is assumed to be zero on rocky seabeds.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Piping And Self Burial   ±

Calculate DNVGL RP-F109 piping and pipeline self burial in non cohesive soils.

Piping occurs with mobile, non cohesive sandy seabeds due to the flow around and underneath the pipe. Self burial is self limiting as the flow reduces with burial depth. The equilibrium burial depth is calculated. The Shields number can be used to check the onset of seabed instability. Self burial is a gradual process which occurs over a period of time. Self burial should be calculated using a sea state significantly smaller than the maximum design sea state.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Curved Pipeline Laying   ±

Calculate DNVGL RP-F109 curved pipeline laying on clay and sandy seabeds.

The lay tension force is calculated to balance the lateral tension force and the passive resistance due to pipe embedment and lateral friction. Pipe embedment is assumed to be zero on rocky seabeds. The pipeline will normally be empty during laying.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Wave Spreading And Directionality   ±

Calculate DNVGL RP-F109 wave spreading and directionality from relative heading and spreading factor.

The wave spreading factor accounts for the "choppiness" or multi directional properties of wave groups. Locally generated waves are generally more multi directional and should have small spreading factors. Long range swells tend to be more uni directional, and can be used with large spreading factors.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Wave Seabed Velocity   ±

Calculate DNVGL RP-F109 wave seabed velocity from the JONSWAP surface spectrum.

An Airy wave transform is used to calculate the significant seabed velocity, and zero upcrossing wave period. The calculation is not valid in shallow water, or at elevations greater than half the water depth.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Wave Probability And Return Period   ±

Calculate DNVGL RP-F109 wave and current amplitude from return period data.

Current velocity, wave height, and wave period can be calculated from return period data using either the Weibull, Gumbel or Frechet probability distributions. Enter data as comma or tab separated sets (eg R, Vc), with each set on a new row. Data can also be copied and pasted from a spreadsheet, or from a text document.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Check Value   ±
DATA MODULE : Material Tensile Strength ( Open In Popup Workbook )   ±
DATA MODULE : DNVGL Design Factor ( Open In Popup Workbook )   ±
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