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Onshore Pipeline Modules

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CALCULATOR MODULE : ASME B31.4 Liquid Pipeline Wall Thickness   ±

Calculate ASME B31.4 oil and liquid pipeline wall thickness from hoop stress for onshore and offshore pipelines.

Select the appropriate line pipe schedule (ASME or ISO etc) and stress table (API, ASM, DNV etc), and material. Wall thickness is calculated using Barlow's formula. For offshore pipelines either the pipe outside diameter or the mid wall diameter can be used to calculate wall thickness. The wall thickness should be checked for all elevations. Use the Result Plot option to plot required wall thickness versus elevation, or hoop stress versus elevation for user defined wall thickness.

Reference : ANSI/ASME B31.4 : Pipeline Transportation Systems For Liquids And Slurries (2012)

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CALCULATOR MODULE : ASME B31.4 Liquid Pipeline Hoop Stress   ±
CALCULATOR MODULE : ASME B31.4 Liquid Pipeline Hydrotest Pressure   ±

Calculate ASME B31.4 oil and liquid pipeline test pressure and hoop stress check for onshore and offshore pipelines.

Select the appropriate line pipe schedule (ASME or ISO etc) and stress table (API, ASM, DNV etc), and material. Hoop stress is calculated using Barlow's formula. For offshore pipelines either the pipe outside diameter or the mid wall diameter can be used to calculate hoop stress. The test pressure and hoop stress should be checked for all elevations. Use the Result Plot option to plot the required test pressure versus elevation, or hoop stress verus elevation for user defined test pressure.

Reference : ANSI/ASME B31.4 : Pipeline Transportation Systems For Liquids And Slurries (2012)

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CALCULATOR MODULE : ASME B31.4 Liquid Pipeline Allowable Stress   ±

Calculate ASME B31.4 oil and liquid pipeline allowable stress for onshore and offshore pipelines.

Select the appropriate stress table (API, ASM, DNV etc), and material. Use the Result Table option to display the results for the selected stress table (click the Result Table button on the plot bar, then click the make table button). For metal pipeline the pressure design thickness equals the nominal wall thickness minus the corrosion allowance. Fabrication tolerance is ignored.

Reference : ANSI/ASME B31.4 : Pipeline Transportation Systems For Liquids And Slurries (2012)

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CALCULATOR MODULE : ASME B31.4 Liquid Pipeline Ripple Defect   ±
CALCULATOR MODULE : ASME B31.4 Liquid Pipeline Branch Reinforcement   ±
CALCULATOR MODULE : ASME B31.4 Liquid Pipeline Design Pressure   ±

Calculate ASME B31.4 oil and liquid pipeline maximum allowable design pressure from pressure design wall thickness and allowable stress.

For subsea pipelines the allowable pressure is the maximum allowable local pressure difference across the pipe wall. The pressure difference equals the internal pressure minus the external pressure. For onshore pipelines the allowable pressure is the maximum allowable local internal pressure. The local internal and external pressure varies with elevation. Use the Result Table option to display the allowable pressure for the selected pipe diameter schedule.

Reference : ANSI/ASME B31.4 : Pipeline Transportation Systems For Liquids And Slurries (2012)

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CALCULATOR MODULE : ASME B31.8 Gas Pipeline Allowable Stress   ±

Calculate ASME B31.8 gas pipeline allowable stress from temperature for onshore and offshore pipelines.

Select the appropriate stress table (API, ASM, DNV etc), and material. Use the Result Table option to display the results for the selected stress table (click the Result Table button on the plot bar, then click the make table button). For metal pipeline the pressure design thickness equals the nominal wall thickness minus the corrosion allowance. Fabrication tolerance is ignored.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018)

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CALCULATOR MODULE : ASME B31.8 Gas Pipeline Wall Thickness   ±

Calculate ASME B31.8 gas pipeline wall thickness from hoop stress for onshore and offshore pipelines.

Select the appropriate line pipe schedule (ASME or ISO etc), and stress table (API, ASME or DNV), or use the user defined options. Pipe pressure can either be calculated from elevation, or user defined. For metal pipeline the pressure design thickness equals the nominal wall thickness minus the corrosion allowance. Fabrication tolerance is ignored. The wall thickness should be checked for all pipeline elevations. A wall thickness should be specified which is greater than or equal to the maximum calculated wall thickness (usually by selecting the next highest schedule thickness). Use the Result Plot option to plot the calculated wall thickness versus elevation, and the hoop stress versus elevation for the specified wall thickness.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018)

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CALCULATOR MODULE : ASME B31.8 Gas Pipeline Hoop Stress   ±

Calculate ASME B31.8 gas pipeline hoop stress from wall thickness for onshore and offshore pipelines.

Pipe pressure can either be calculated from elevation, or user defined. Select the appropriate line pipe schedule (ASME or ISO etc), and stress table (API, ASME or DNV), or use the user defined options. For metal pipeline the pressure design thickness equals the nominal wall thickness minus the corrosion allowance. Fabrication tolerance is ignored.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018)

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CALCULATOR MODULE : ASME B31.8 Gas Pipeline Hydrotest Pressure   ±

Calculate ASME B31.8 gas pipeline test pressure and hoop stress check for onshore and offshore pipelines.

Select the appropriate line pipe schedule (ASME or ISO etc), and stress table (API, ASME or DNV), or use the user defined options. For metal pipeline the pressure design thickness equals the nominal wall thickness minus the corrosion allowance. Fabrication tolerance is ignored. Pipe pressure can either be calculated from elevation, or user defined. The test pressure should be checked for all pipeline elevations. A test point test pressure should be specified which is greater than or equal to the maximum calculated test pressure (usually by rounding up the maximum test pressure). Use the Result Plot option to plot the test pressure versus elevation, and the hoop stress versus elevation for the specified test pressure.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018)

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CALCULATOR MODULE : ASME B31.8 Gas Pipeline Ripple And Dent Defect   ±
CALCULATOR MODULE : ASME B31.8 Gas Pipeline Maximum Allowable Operating Pressure   ±

Calculate ASME B31.8 gas pipeline MAOP from the design pressure and the test pressure.

The design pressure is the minimum value of allowable pressure at all points on the pipeline. If the design pressure is not known, use the hoop stress calculators to calculate the design pressure. Use the goal seek option to calculate the allowable pressure at the allowable stress at all points on the pipeline. The minimum value of allowable pressure is the design pressure. Use the pressure design wall thickness for the hoop stress calculations.

The test pressure is the minimum value of the local test pressure at all points on the pipeline. If the minimum test pressure is not known (only the test pressure at the test location is known), use the test pressure calculators to calculate the local test pressure from the test pressure at the test location, at all points on the pipeline. Use the minimum value of local test pressure as the test pressure.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018)

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CALCULATOR MODULE : ASME B31.8 Gas Pipeline Branch Reinforcement   ±
CALCULATOR MODULE : ASME B31.8 Gas Pipeline Local Pressure   ±
CALCULATOR MODULE : ASME B31.8 Gas Pipeline Design Pressure   ±

Calculate ASME B31.8 gas pipeline maximum allowable design pressure from allowable stress and pressure design wall thickness.

For onshore pipelines and offshore platform piping the allowable pressure is the maximum allowable design pressure for the pipeline location class and facility type. For submerged offshore pipelines the allowable pressure is the maximum allowable pressure difference (internal pressure minus external pressure). Use the Result Table option on the plot bar to display the allowable pressure for the selected pipe diameter.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018)

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CALCULATOR MODULE : Pipeline Local Pressure   ±
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 : API 5L Line Pipe Out Of Roundness Tolerance   ±

Calculate API 5L line pipe out of roundness and ovality from diameter and tolerance.

Out of roundness is equal to the maximum diameter minus the minimum diameter measured at the same cross section. Out of roundness ratio equals the out of roundness divided by either the nominal diameter or the mean diameter. DNV or ISO ovality is equal to the out of roundness ratio. API ovality is equal to half the DNV ovality (DNV or ISO ovality is equal to 2 x API ovality).

`Davg = (Dmax + Dmin) / 2 `
`OOR = (Dmax - Dmin) `
`ro = (OOR) / (Davg) `
`fa = (Dmax - Dmin) / (Dmax + Dmin) = (OOR) / (2.Davg) = (ro) / 2 `
`fd = 2.(Dmax - Dmin) / (Dmax + Dmin) = (OOR) / (Davg) = 2.fa = ro `

where :

OOR = out of roundness
ro = out of roundness ratio
Dmax = maximum diameter
Dmin = minimum diameter
Davg = average or mean diameter
fa = API ovality
fd = DNVGL or ISO ovality

Out of roundness can be calculated from API 5L, from user defined out of roundness, or from user defined maximum and minimum diameter. For diameter D ≥ 0.2191 m, the out of roundness can be calculated from the inside diameter. For D < 0.0603 m the out of roundness is included with the diameter tolerance. For D ≥ 1.422 m the out of roundness tolerance is to be agreed with the supplier. All tolerances should be entered as positive (+ve) values.

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 : API 5L Line Pipe Wall Thickness Tolerance   ±

Calculate API 5L line pipe maximum and minimum wall thickness from tolerance.

Wall thickness tolerance can be calculated from API 5L, or specified as either a wall thickness fraction, or a wall thickness allowance.

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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DATA MODULE : ASME ANSI API Design Factor ( Open In Popup Workbook )   ±
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