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ANSI B31.3 Process Piping Modules

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CALCULATOR MODULE : ASME B31.3 Process Piping Line Pipe Schedule   ±

Calculate ASME B31.3 process piping schedule for metal and plastic piping.

The piping minimum wall thickness and hoop stress wall thickness schedule can be calculated from the nominal wall thickness, fabrication tolerance and corrosion allowance.

`tm = tn - fa `
`tm = (1 - fx) tn `
`t = tm - c `

where :

tn = nominal wall thickness
tm = minimum wall thickness
t = hoop stress wall thickness
c = corrosion thickness allowance
fa = negative fabrication thickness allowance
fx = negative fabrication fraction

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 tolerance, 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 dimensions versus wall thickness, wall tolerance, or piping diameter for metal pipes, or pipe dimension versus wall thickness for plastic pipes.

Calculate metal piping maximum and minimum diameter schedule. Use the Result Table option to display a table of pipe dimensions versus wall thickness, wall tolerance, or piping diameter.

Calculate piping unit mass and joint mass schedule for metal and plastic piping. Use the Result Table option to display a table of pipe dimensions and mass versus wall thickness.

Calculate piping tensile stress, yield stress and allowable schedule for metal piping. Use the Result Table option to display a table of stress versus material type.

Plastic pipe wall thickness can be defined by wall thickness or diameter ratio (DR or IDR). Select standard diameter ratios from the plastic pipe schedule (SDR or SIDR), or use user defined diameter ratios (DR or IDR).

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

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CALCULATOR MODULE : ASME B31.3 Process Piping Basic Allowable Stress   ±

Calculate ASME B31.3 process piping allowable stress (S), yield stress (SYT) and tensile stress (SUT) from temperature for low pressure piping (ASME B31.3 Table A-1) and high pressure piping (ASME B31.3 Table K-1).

Stress values are interpolated from the US data tables (US units govern). For temperatures below the data range, the stress value is constant (fracture toughness should also be considered for low temperature operation). For temperatures above the data range the stress values can either be constant value from the end point, constant slope from the end point, or zero from the end point. Engineering judgement is required to use extrapolated values above the data range.

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 K-1). Use the Result Table option to display a table of allowable stress versus material type. 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 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 Hoop Stress   ±

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

The hoop stress can be calculated for either the minimum wall thickness (nominal wall thickness minus fabrication allowance), or the pressure design wall thickness (minimum wall thickness minus the corrosion allowance). For operation the hoop stress should be ≤ the design stress. For pressure tests, the hoop stress should be ≤ 100% of yield stress for hydrotest, or ≤ 90% of yield stress for pneumatic tests. For combined internal and external pressure use the pressure difference in the calculations. 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 Hydrotest Pressure   ±

Calculate ASME B31.3 process piping hydrotest and pneumatic leak test pressure and hoop stress check. The test pressure should be 1.5 times the design pressure for hydrotest, or 1.1 times the design pressure for pneumatic test. An allowance should be made for the pipe design temperature.

Hoop stress can be calculated for either the minimum wall thickness (nominal wall thickness minus fabrication allowance), or the pressure design wall thickness (minimum wall thickness minus the corrosion allowance). Minimum wall thickness is recommended for new piping, or piping in as new condition. The pressure design wall thickness is recommended for corroded piping. The hoop stress should be ≤ 100% of yield for hydrotest, or ≤ 90% of yield for pneumatic tests. The test pressure should be ≤ 1.5 x the pressure rating for pressure rated components.

For piping systems with combined internal and external pressure during operation, the test pressure should be calculated from the internal pressure only. The hoop stress should be calculated from the pressure difference during testing. 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 Plastic Component   ±

Calculate ASME B31.3 process piping wall thickness, hoop stress and hydrotest pressure for low pressure plastic piping.

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 Elastic Modulus   ±

Calculate ASME B31.3 process piping elastic modulus versus temperature from table C (US Units). The elastic modulus is extrapolated with constant slope for temperatures outside the data range.

Use the Data Plot option to plot the expansion modulus versus temperature for the selected material. Use the Data Table option to display the data table. Change units on the setup page. Use the workbook ASME B31.3 data tables to look up elastic modulus data.

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

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CALCULATOR MODULE : ASME B31.3 Process Piping Thermal Expansion   ±

Calculate ASME B31.3 thermal expansion from temperature (ASME B31.3 Table C-2).

Table C-2 provides thermal expansion strain data (mm/m) from 20 degrees C base temperature. The expansion data is used to calculate

  • thermal expansion strain from 20 degrees C to the design temperature
  • thermal expansion strain from the design base temperature to the design temperature
  • thermal expansion length from the design base temperature to the design temperature
  • thermal expansion coefficient at the design temperature
  • The average thermal expansion coefficient from the design base temperature to the design temperature

Use the Data Plot option to plot thermal expansion 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 expansion coefficient, expansion strain and expansion length versus material type. Strain (ε) has units meter per meter [m/m]. The expansion strain data uses units of milli meter per meter [mm/m] or [mε] milli strain. Change units on the setup page. Refer to the help pages for notes on the data tables. Use the workbook ASME B31.3 data tables to look up thermal expansion data.

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

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CALCULATOR MODULE : ASME B31.3 Process Piping Branch Reinforcement   ±

Calculate ASME B31.3 process piping required branch reinforcement for welded and extruded branches.

The calculations are valid for right angle welded branches, angled welded branches ≥ 45 degrees, and right anngle extruded branches. Extruded branches must be used for high pressure piping. 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 Factor   ±

Calculate ASME B31.3 process piping design factors (Y factor and W factor).

The Y factor is calculated from diameter for thick wall pipe (D/t < 6), or from temperature for thin wall pipe. The weld factor (W) is only relevant for design temperatures in the creep range. For design temperatures below the creep onset temperature W = 1. The weld factor does not apply for seamless pipe (W = 1).

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 Minimum Temperature For Impact Testing   ±

Calculate ASME B31.3 process piping minimum temperature for impact testing from wall thickness and material type.

For carbon steel materials with a minimum temperature letter designation, the minimum temperature for testing can be calculated according to table 323.2.2A (curves A, B, C and D).

If the maximum stress is less than the design stress, the impact testing temperature can be reduced according to figure 323.2.2B using the stress ratio. The stress ratio is the maximum of hoop stress over design stress, combined stress over design stress, or operating pressure over pressure rating for pressure rated components. The reduction in impact testing temperature from stress ratio is valid for minimum temperatures listed in table A-1, and for minimum temnperatures calculated from a letter designation (curves A, B, C or D). Use the workbook ASME B31.3 data tables to look up minimum temperature and letter designation data.

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

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CALCULATOR MODULE : ASME B31.3 Process Piping Allowable Bolt Load And Bolt Stress   ±

Calculate ASME B31.3 process piping bolt design load and design stress from temperature (ASME B31.3 Table A-2). Stress values are interpolated from the US data tables (US units govern).

Bolt load is calculated from the design stress and the tensile area for either ANSI threads or ISO threads. For temperatures below the data range, the stress value is constant (fracture toughness should also be considered for low temperature operation). For temperatures above the data range the stress values can either be constant value from the end point, constant slope from the end point, or zero from the end point. Engineering judgement is required to use extrapolated values above the data range.

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 (Table A-2). Use the Result Table option to display a table of design stress and design load versus either material type or bolt diameter. Refer to the help pages for notes on the data tables. Use the workbook ASME B31.3 data tables to look up bolt 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 B31.3 Process Piping Mass And Weight   ±

Calculate ASME B31.3 process piping unit mass (mass per length), unit weight (weight per length), and total mass for metal and plastic pipe. The mass per joint can be calculated from the joint length. Construction quantities can be calculated from the total pipe length. Pipe mass and pipe unit weight (weight per length) can be calculated for multi layer pipelines (dry empty, dry full, wet empty and wet full piping). For multi layer pipelines, the first internal layer is the line pipe. Change the number of layers on the setup page.

The pipe diameter and thickness are calculated from the pipe schedule. Plastic pipe wall thickness can be defined by wall thickness or diameter ratio (DR or IDR). Select standard diameter ratios from the plastic pipe schedule (SDR or SIDR), or use user defined diameter ratios (DR or IDR). Use the Result Table option to display a table of pipe mass versus schedule wall thickness for the selected diameter.

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

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CALCULATOR MODULE : ASME B31.3 Process Piping Fluid Volume And Mass   ±

Calculate ASME B31.3 process piping fluid density, fluid volume and fluid mass for two phase gas liquid piping, and three phase black oil piping (gas water and 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 : ANSI/ASME B31.3 : Process Piping (2018)

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CALCULATOR MODULE : ASME B31.3 Process Piping Fluid Velocity And Flow Rate   ±

Calculate ASME B31.3 process piping fluid velocity and flow rate for two phase gas liquid piping, and three phase black oil piping (gas water and 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 : ANSI/ASME B31.3 : Process Piping (2018)

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CALCULATOR MODULE : ASME B31.3 Process Piping Flexibility And Stress Factor   ±
DATA MODULE : ASME B31.3 Process Piping Allowable Stress ( Open In Popup Workbook )   ±
DATA MODULE : ASME B31.3 Process Piping Elastic Modulus ( Open In Popup Workbook )   ±
DATA MODULE : ASME B31.3 Process Piping Thermal Expansion ( Open In Popup Workbook )   ±

Thermal expansion coefficient data for ASME B31.3 process piping (Table C SI values).

Thermal expansion (mm/m) is measured from a base temperature of 68 F or 20 C. Use the ASME B31.3 thermal expansion calculators (see link below) to interpolate thermal expansion data values, calculate thermal expansion coefficient, or calculate thermal expansion from a different base temperature.

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

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DATA MODULE : ASME B31.3 Process Piping Weld Quality Factor ( Open In Popup Workbook )   ±
DATA MODULE : ASME B31.3 Process Piping Plastic Component ( Open In Popup Workbook )   ±
DATA MODULE : ASME B31.3 Process Piping Design Factor ( Open In Popup Workbook )   ±
DATA MODULE : ASME B31.3 Process Piping Minimum Temperature For Impact Testing ( Open In Popup Workbook )   ±
DATA MODULE : ASME B31.3 Process Piping Allowable Bolt Stress ( Open In Popup Workbook )   ±
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