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Pipeline Diameter Modules

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CALCULATOR MODULE : Line Pipe Cross Section   ±

Calculate pipe internal and external diameter, cross section area and EI from pipe schedule diameter and wall thickness.

Use the Result Table option to display the results for the selected pipe diameter. For multi layer pipes (line pipe with outside layers and or inside layers), the results for each layer are displayed in the output view at the bottom of the page. Change the number of layers on the setup page.

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CALCULATOR MODULE : Line Pipe Wall Thickness And Diameter   ±

Calculate pipe nominal wall thickness, minimum wall thickness and pressure design wall thickness from pipe schedule diameter and wall thickness.

For most pipeline codes the pressure design thickness equals the nominal wall thickness minus the fabrication allowance and the corrosion allowance (use the with tolerance calculator). For some codes the fbrication allowance is ignored and the pressure design thickness equals the nominal wall thickness minus the corrosion allowance.

Use the Result Table option to display the results for the selected pipe schedule and pipe diameter.

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CALCULATOR MODULE : Line Pipe Diameter Wall Thickness And Mass Schedule   ±
CALCULATOR MODULE : ASME B31.8 Gas Pipeline Sour Gas Service   ±
CALCULATOR MODULE : ASME B31G Pipe Corrosion Defect   ±

Calculate ASME B31G piping level 0 corrosion defect assessment for blunt defects (corrosion defects or other defects).

The level 0 assessment is useful as a screening check. The allowable defect length is calculated from the maximum defect depth. The calculation is taken from ASME B31G 1999 (original ASME B31G). The level 0 check is suitable for blunt defects of all types, including corrosion, mechanical damage and grinding repairs etc. For crack type defects the NG-18 crack defect calculators are recommended. The RSTRENG method (effective area method) can also be used for blunt type defects. The temperature derating calculation is from ASME B31.8. Material specific test data should be used if it is available.

Defects failing the level 0 check should be checked with a level 1 or level 2 assessment (see module links below). Use the level 1 assessment for simple defects from defect length and depth using either the original ASME B31G equation, or the modified ASME B31G equation. Use the level 2 assessment for complex defects from the defect river bottom profile.

Reference : ANSI/ASME B31G Manual For Determining The Remaining Strength Of Corroded Pipelines (2012)

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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 : API 5L Line Pipe Diameter Tolerance   ±

Calculate API 5L line pipe maximum and minimum diameter from nominal diameter and tolerance.

Tolerances can be calculated from API 5L, or specified as either a diameter allowance or a diameter fraction.

References :

API 5L : Specification for Line Pipe (2007)
ISO 3183 : Petroleum and Natural Gas Industries - Steel Pipe For Pipeline Transportation Systems (2007)

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CALCULATOR MODULE : ASME B31 Pipe Diameter And Wall Thickness Schedule   ±

Calculate ASME B31 line pipe diameter and pressure design wall thickness with and without fabrication tolerances.

For some pipe codes (eg ASME B31.4, ASME B31.8, API RP 111 and AS 2885.1) the fabrication tolerance is included in the design factor, and provided that fabrication tolerances are within the relevant specification. For these codes the pressure design or pressure containment wall thickness equals the nominal wall thickness minus the corrosion and mechanical allowance.

For other codes (eg ASME B31.1, ASME B31.3 and ASME B31.5) the fabrication tolerance must be included in the pressure design calculation. For these codes 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 cross section versus wall thickness for the selected diameter.

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CALCULATOR MODULE : Bolt Pitch Diameter From Bolt Size And Thread   ±

Calculate bolt pitch diameter from bolt diameter D and bolt pitch P.

For ANSI threads, the bolt pitch diameter Dp is equal to D - 0.65 * P. For ISO threads, the bolt pitch diameter Dp is equal to D - 0.6495191 * P. Use the Result Table option to display a table of bolt pitch diameter versus bolt diameter for the selected bolt schedule.

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CALCULATOR MODULE : Piping Fitting Minor Loss Factor   ±

Calculate pipe fitting minor loss factors.

Minor loss factors can be defined as:

  • Av (SI) flow coefficient - the flow in cubic meters per second fluid density 1 kilogram per cubic meter which gives a pressure drop of 1 Pa
  • Cv-uk (UK) flow coefficient - the flow in UK gallons per minute of water at 60 degrees F which gives a pressure drop of 1 psi
  • Cv-us (US) flow coefficient - the flow in US gallons per minute of water at 60 degrees F which gives a pressure drop of 1 psi
  • Cv-met (Metric) flow coefficient - the flow in liters per minute of water at 16 degrees C which gives a pressure drop of 1 bar
  • Kv (EU) flow coefficient - the flow in cubic meters per hour of water at 16 degrees C which gives a pressure drop of 1 bar
  • Cv* the dimensionless US flow factor = Cv-us / din^2 (din is the inside diameter in inches)
  • K factor - the ratio of pressure loss over the dynamic pressure
  • Cd or discharge coefficient - the ratio of the actual flow rate of the fluid through the fitting over the frictionless flow rate.

The K factor and discharge coefficient are dimensionless and can be used with any consistent set of units. The dimensionless flow coefficient has inconsistent units, and is unit specific. The flow coefficient Av, Cv-us, Cv-uk, Cv-met and Kv have dimensions length squared, and can not be used interchangeably between different systems of units.

Note : The friction factor K, discharge coefficient Cd, dimensionless flow coefficient Cv*, and flow coefficients Av, Cv-uk, Cv-us, Cv-met and Kv are used in different situations. The discharge coefficient is usually used for discharge through an orifice, but can also be used in other situations (for example pressure relief valves). The flow coefficients Av, Cv-uk, Cv-us, Cv-met and Kv, and the dimensionless flow coefficient Cv* are usually used for valves, but can also be used for other fittings. Engineering judgement is required to determine the correct minor loss factor to use.

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CALCULATOR MODULE : Dimensionless Relative Roughness Number   ±

Calculate the dimensionless relative roughness or roughness number for pipes and rectangular ducts.

`rr = (ir) / (ID) `

where :

rr = relative roughness or roughness number
ir = surface roughness
ID = pipe inside diameter

For rectangular ducts the hydraulic diameter is used

`ID = 2 w h / (w + h) `

where :

ID = hydraulic diameter
w = duct width
h = duct height

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CALCULATOR MODULE : DNVGL RP O501 Pipeline Reducer Erosion Rate   ±
CALCULATOR MODULE : Water Hammer Pipe Diameter Schedule   ±

Calculate transient flow pipe inside diameter and internal cross section area from pipe diameter and wall thickness.

Use the Result Table option to display a table of the inside diameter and cross section area versus either outside diameter or wall thickness.

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CALCULATOR MODULE : Subsea Pipeline Lay Radius   ±

Calculate subsea pipeline minimum lay radius from soil friction and lay tension.

The lay radius is limited by the lateral friction resistance at the pipeline laydown point.

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DATA MODULE : Line Pipe Diameter And Wall Thickness ( Open In Popup Workbook )   ±
DATA MODULE : Line Pipe Manufacturing Tolerance ( Open In Popup Workbook )   ±
DATA MODULE : Line Pipe Joint Length ( Open In Popup Workbook )   ±
DATA MODULE : ASME B31 Pipe And Flange Dimension ( Open In Popup Workbook )   ±

ASME B31.8 gas pipe and flange data values: pipe dimensions, flange dimensions, cover requirements, cold bends, burn through and location class.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems

    Related Modules :

    DATA MODULE : Flange Bolt ( Open In Popup Workbook )   ±
    DATA MODULE : Pipe Flange ( Open In Popup Workbook )   ±
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