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Pipeline Wall Thickness Modules

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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 B31.3 Process Piping Wall Thickness   ±

Calculate ASME B31.3 process piping wall thickness from temperature for low pressure steel pipe (Table A-1), high pressure steel pipe (Table K-1), and plastic piping.

Allowable stress for steel pipe is calculated from Table A-1 and Table K-1 US values (US units govern). Change units on the setup page. Stress values can be extrapolated for temperatures above the data range (care is required when using extrapolated values). The wall thickness calculations are valid for internal overpressure only. For combined internal and external pressure use the pressure difference in the calculations.

Use the Data Plot option to plot the allowable stress versus temperature for the selected material. Use the Data Table option to display the data table in the popup window (Table A-1, or Table K-1). Use the Result Table option to display a table of wall thickness and allowable pressure versus material type (for the calculate wall thickness option the allowable pressure equals the design pressure. for the specified wall thickness option the wall thickness equals the specified wall thickness). Refer to the help pages for notes on the data tables. Change units on the setup page. Use the workbook ASME B31.3 data tables to look up allowable stress data.

Note : The choice of high pressure versus low pressure service is at the discretion of the owner (section FK300). The ASME B16.5 Class 2500 pressure temperature rating for the material group is often used as a criteria.

Reference : ANSI/ASME B31.3 : Process Piping (2018)

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CALCULATOR MODULE : ASME B31.3 Process Piping Blank Flange   ±
CALCULATOR MODULE : ASME B31.3 Process Piping Bend   ±

Calculate ASME B31.3 process piping minimum thickness for formed bends, and allowable pressure for miter bends.

Minimum thickness of formed bends is calculated for the inside radius, the oputside radius, and the centerline radius. Bend thinning on the outside radius is estimated using the method from ASME B31.1. The estimated minimum bend thickness after thinning should be ≥ the required minimum bend thickness on the outside radius (extrados). Use the goal seek option to calculate the required straight pipe nominal wall thickness (before bending), for the minimum thickness on the outside radius (after bending).

The allowable pressure for miter bends is calculated from the nominal wall thickness. Use the goal seek option to calculate the required miter bend nominal wall thickness for the design pressure. Use the workbook ASME B31.3 data tables to look up allowable stress data.

Reference : ANSI/ASME B31.3 : Process Piping (2018)

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CALCULATOR MODULE : ASME B31.3 Process Piping Design Pressure   ±

Calculate ASME B31.3 process piping design pressure for low pressure steel pipe (Table A-1), high pressure steel pipe (Table K-1), and plastic piping.

The design pressure is calculated from the pipe diameter, wall thickness, wall thickness tolerance and allowable stress (Table A-1 and Table K-1 US values : US units govern). The hoop stress is equal to the design stress at the design pressure. Change units on the setup page. Stress values can be extrapolated for temperatures above the data range (care is required when using extrapolated values). For combined internal and external pressure, the design pressure equals the pressure difference.

Use the Result Table option to display a table of design pressure versus wall thickness or design pressure versus material type. Use the Data Plot option to plot the design stress versus temperature for the selected material. Use the Data Table option to display the data table in the popup window (Table A-1, or Table K-1). Refer to the help pages for notes on the data tables (click the resources button on the data bar). Use the workbook ASME B31.3 data tables to look up allowable stress data.

Note : The choice of high pressure versus low pressure service is at the discretion of the owner (section FK300). The ASME B16.5 Class 2500 pressure temperature rating for the material group is often used as a criteria.

Reference : ANSI/ASME B31.3 : Process Piping (2018)

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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 B31.8 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 B31.1 Power Piping Wall Thickness   ±

Calculate ASME B31.1 power piping wall thickness from the design temperature.

Wall thickness can be calculated from either the outside diameter (constant OD), or the inside diameter (constant ID).

The allowable stress (SE) is calculated from tables A-1 to A-9. For temperatures above the data range, select either constant value, constant slope, or zero value (engineering judgement is required). The weld factor W is relevant for temperatures in the creep range. For temperatures below the creep onset temperature W = 1. The ASME Y factor can either be calculated, or user defined. For thick wall pipe (D/tm < 6) Y is calculated from the diameter. For thin wall pipe Y is calculated from the temperature. For combined internal and external pressure use the pressure difference in the calculations.

Use the data plot option to plot the allowable stress versus temperature for the selected material. Use the Data Table option to display the data table in the popup window. Use the Result Table option to display a table of wall thickness and allowable pressure versus material type (for the calculate wall thickness option the allowable pressure equals the design pressure. for the specified wall thickness option the wall thickness is constant). The calculations use SI standard units. Change input and output units on the setup page. Refer to the help pages for notes on the data tables (click the resources button on the data bar). Use the workbook ASME B31.1 data tables to look up allowable stress data.

Reference : ANSI/ASME B31.1 : Power Piping (2014)

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CALCULATOR MODULE : ASME B31.1 Power Piping Blank Flange   ±
CALCULATOR MODULE : ASME B31.1 Power Piping Bend   ±
CALCULATOR MODULE : ASME B31.1 Power Piping Design Pressure   ±

Calculate ASME B31.1 power piping design pressure from the design temperature.

The design stress (SE) is calculated from tables A-1 to A-9. For temperatures above the data range, select either constant value, constant slope, or zero value (engineering judgement is required). The weld factor W is relevant for temperatures in the creep range. For temperatures below the creep onset temperature W = 1. The ASME Y factor can either be calculated, or user defined. For thick wall pipe (D/tm < 6) Y is calculated from the diameter. For thin wall pipe Y is calculated from the temperature. For combined internal and external pressure use the pressure difference in the calculations.

Use the table data option for a table of allowable pressure versus wall thickness for the selected pipe schedule and diameter. Use the data plot option to plot the allowable stress versus temperature for the selected material. Use the Data Table option to display the data table in the popup window. Use the Result Table option to display a table of allowable pressure versus material type, or allowable pressure versus wall thickness. The calculations use SI standard units. Change input and output units on the setup page. Refer to the help pages for notes on the data tables (click the resources button on the data bar). Use the workbook ASME B31.1 data tables to look up allowable stress data.

Reference : ANSI/ASME B31.1 : Power Piping (2014)

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CALCULATOR MODULE : ASME B31.5 Refrigeration Piping Wall Thickness   ±

Calculate ASME B31.5 refrigeration piping wall thickness from internal pressure and design temperature .

Allowable stress is calculated from temperature using Table 502.3.1 (US values). Change units on the setup page. Stress values can be extrapolated for temperatures above the data range (care is required when using extrapolated values). The wall thickness calculations are valid for internal overpressure only. For combined internal and external pressure use the pressure difference in the calculations.

Use the data plot option to plot the allowable stress versus temperature for the selected material. Use the Data Table option to display the data table in the popup window. Use the Result Table option to display a table of wall thickness and allowable pressure versus material type (for the calculate wall thickness option the allowable pressure equals the design pressure. For the specified wall thickness option the wall thickness is constant). Use the workbook ASME B31.5 data tables to look up allowable stress data.

Reference : ANSI/ASME B31.5 : Refrigeration Piping And Heat Transfer Components (2013)

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CALCULATOR MODULE : ASME B31.5 Refrigeration Piping Blank Flange And Closure   ±
CALCULATOR MODULE : ASME B31.5 Refrigeration Piping Design Pressure   ±

Calculate ASME B31.5 refrigeration piping maximum allowable design pressure from wall thickness and design temperature .

Allowable stress is calculated from temperature using Table 502.3.1 (US values). Change units on the setup page. Stress values can be extrapolated for temperatures above the data range (care is required when using extrapolated values). For combined internal and external pressure the allowable pressure is equal to the maximum allowable pressure difference.

Use the data plot option to plot the allowable stress versus temperature for the selected material. Use the Data Table option to display the relevant data table. Use the Result Table option to display a table of allowable pressure versus wall thickness for the selected pipe schedule.

Reference : ANSI/ASME B31.5 : Refrigeration Piping And Heat Transfer Components (2013)

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CALCULATOR MODULE : Pipeline Wall Thickness   ±
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 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 RP 1111 Pipeline Wall Thickness   ±

Calculate API RP 1111 limit state pipeline wall thickness from local pressure.

The pipe wall thickness should be calculated for the maximum pressure difference at all points on the pipeline or pipeline section. Internal pressure is calculated from reference pressure and elevation. The internal fluid density is assumed constant. External pressure should be calculated for the minimum local water depth (lowest astronomical tide and allowance for storm surge etc). API RP 1111 should only be used for line pipe with a weld joint factor = 1.0.

Note : The derated yield stress and tensile stress are used in the API RP 1111 calculations.

Reference : API RP 1111 : Design, Construction, Operation, and Maintenance of Offshore Hydrocarbon Pipelines (Limit State Design) (2011)

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CALCULATOR MODULE : API RP 1111 Pipeline Burst Pressure   ±
CALCULATOR MODULE : API RP 1111 Pipeline Design Pressure   ±

Calculate API RP 1111 limit state pipeline maximum allowable design pressure from wall thickness and burst stress.

Burst stress is calculated from the average of the yield stress and the ultimate tensile stress. Burst pressure can be calculated from either equation 4, or equation 5. The maximum test pressure, incidental pressure and design pressure are calculated from the burst pressure. The allowable pressure is calculated so that the hoop stress equals the allowable stress. For submerged pipelines the allowable pressure equals the pressure difference (internal pressure minus external pressure).

Reference : API RP 1111 : Design, Construction, Operation, and Maintenance of Offshore Hydrocarbon Pipelines (Limit State Design) (2011)

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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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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 : AS 2885.1 Pipeline Wall Thickness   ±

Calculate AS 2885.1 pipeline wall thickness from hoop stress for dry and submerged pipelines.

Pipe wall thickness is governed by the maximum internal pressure for dry pipelines, or the maximum pressure difference for wet pipeline sections. For dry pipelines, the maximum internal pressure occurs at the lowest point on the pipeline or pipeline section. For wet oil and gas pipelines with internal fluid SG less than 1, the maximum pressure difference occurs at the highest submerged elevatin (eg the water surface). The required wall thickness should be calculated for each different section based on the primary and secondary location class. For each section, a wall thickness should be selected which is greater than or equal to the required wall thickness for the whole section.

Use the Result Plot option to plot either the calculated wall thickness versus elevation, or the hoop stress versus elevation for the selected wall thickness. Wall thickness is calculated using Barlow's formula. The fabrication allowance is required for pipes where the fabrication tolerance exceeds the relevant specification (for example some seamless pipe).

Reference : Australian Standard AS 2885.1 : Pipelines - Gas And Liquid Petroleum Part 1 : Design And Construction (2015)

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CALCULATOR MODULE : API RP 14E Piping Wall Thickness   ±
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

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