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ASME B31.8 Gas Pipeline

Calculate ASME B31.8 gas 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. diameter.

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

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Links : ±
CALCULATOR : ASME B31.8 Metal Pipe Diameter And Wall Thickness Schedule [FREE]   ±

Calculate ASME B31.8 metal pipe diameter and pressure design wall thickness from pipe schedule or user defined diameter and wall thickness (ASME B31.8 section 841.1). For ASME B31.8 the fabrication tolerance is accounted for in the design factor. The fabrication tolerance is ignored when calculating the pressure design thickness. The pressure design thickness equals the nominal thickness minus the corrosion allowance.

Select the pipe schedule (NPS or ISO), pipe diameter and wall thickness, or use the user defined option. Use the Result Table option to display the pipe schedule with nominal wall thickness and pressure design wall thickness for the selected diameter. Fabrication tolerance is ignored.

Tool Input

  • schdtype : Line Pipe Schedule Type
  • diamtype : Line Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • c : Wall Thickness Corrosion Allowance

Tool Output

  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness
CALCULATOR : ASME B31.8 Plastic Pipe Diameter And Wall Thickness Schedule [FREE]   ±

Calculate ASME B31.8 plastic pipe diameter and pressure design wall thickness from pipe schedule or user defined diameter and wall thickness (ASME B31.8 section 842.2).

Select the pipe schedule (NPS or ISO), pipe diameter and wall thickness, or use the user defined option. Use the Result Table option to display the results for the selected diameter. Fabrication tolerance is included.

Tool Input

  • schdtype : Schedule Type
  • diamtype : Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
    • DRu : User Defined Dimension Ratio SDR OR SIDR
  • ttoltype : Wall Thickness Fabrication Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • c : Wall Thickness Mechanical Allowance

Tool Output

  • CVG : Convergence Factor
  • DR : Pipe Dimension Ratio (SDR Or SIDR)
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness
CALCULATOR : ASME B31.8 Metal Pipe Mass Per Length And Total Mass Schedule [FREE]   ±

Calculate ASME B31.8 metal pipe unit mass and total mass from pipe schedule or user defined pipe diameter and wall thickness.

Select the pipe schedule (NPS or ISO), pipe diameter and wall thickness, or use the user defined option. Use the Result Table option to display the pipe schedule with unit mass and total mass for the selected diameter.

Tool Input

  • schdtype : Schedule Type
  • diamtype : Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • modptype : Material Property Type
    • ρpu : User Defined Pipe Density
  • L : Pipe Length

Tool Output

  • ρp : Pipe Density
  • ID : Nominal Inside Diameter
  • M : Pipe Total Mass
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • m : Pipe Mass Per Length
  • tn : Nominal Wall Thickness
CALCULATOR : ASME B31.8 Plastic Pipe Mass Per Length And Total Mass Schedule [FREE]   ±

Calculate ASME B31.8 plastic pipe unit mass and total mass from pipe schedule or user defined pipe diameter and wall thickness.

Select the pipe schedule (NPS or ISO), pipe diameter and wall thickness, or use the user defined option. Use the Result Table option to display the results for the selected diameter.

Tool Input

  • schdtype : Schedule Type
  • diamtype : Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
    • DRu : User Defined Dimension Ratio SDR OR SIDR
  • ttoltype : Wall Thickness Fabrication Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • modptype : Material Property Type
    • ρpu : User Defined Pipe Density
  • c : Wall Thickness Mechanical Allowance
  • L : Pipe Length

Tool Output

  • ρp : Pipe Density
  • CVG : Convergence Factor
  • DR : Pipe Dimension Ratio (SDR Or SIDR)
  • ID : Nominal Inside Diameter
  • M : Pipe Total Mass
  • OD : Nominal Outside Diameter
  • m : Pipe Mass Per Length
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness

CALCULATOR : ASME B31.8 Pipe Unit Mass And Unit Weight Including Contents And Buoyancy (Multi Layer Pipe) [FREE]   ±

Calculate ASME B31.8 gas pipeline unit mass and unit weight including contents and buoyancy for multi layer pipelines. Select either dry empty, dry full, wet empty, or wet full to calculate unit weight.

Select the pipe schedule (NPS or ISO), pipe diameter and wall thickness, or use the user defined option. The line pipe is the first inside layer. The line pipe wall thickness is either taken from the selected schedule value, or the user input wall thickness is used if the user defined wall thickness option is selected. Details for each layer are displayed in the output view at the bottom of the page. Use the Result Table option to display the results for the selected diameter.

Tool Input

  • schdtype : Line Pipe Schedule Type
  • diamtype : Line Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Line Pipe Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • wltype : Pipe Weight Type
  • WTi : Pipe Liner Wall Thickness
  • ρi : Pipe And Liner Density
  • WTo : Pipe Coating Wall Thickness
  • ρo : Pipe Coating Density
  • ρf : Contents Fluid Density
  • ρb : Displaced Fluid Density

Tool Output

  • IID : Pipe Inner Diameter Including Liners
  • OD : Line Pipe Nominal Diameter
  • OOD : Pipe Outer Diameter Including Coatings
  • SG : Pipe Specific Gravity Relative To Displaced Fluid
  • mb : Displaced Fluid Mass Per Length
  • mc : Contents Fluid Mass Per Length
  • mi : Inner Layers Total Unit Mass
  • mo : Outer Layers Total Unit Mass
  • mp : Pipe Mass Per Length Including Liner And Coating
  • tn : Line Pipe Nominal Wall Thickness
  • w : Pipe Total Weight Per Length Including Contents and Buoyancy
CALCULATOR : ASME B31.8 Section 841.1 Pipeline Temperature Derated Yield Stress And Tensile Stress [FREE]   ±

Calculate temperature derating factor, and derated yield stress and tensile stress from temperature (ASME B31.8 section 841.1).

Refer to Table 841.1.8-1 for the derating factors. The derating factors are valid for steel pipe upto 232 C (450 F). For temperatures above 232 C (450 F) the derating values should be used carefully (material specific test data should be used if it is available). The derating factor is assumed to be valid for yield stress and tensile stress. Use the Result Table option to display the results for the selected stress table (API, ASME or DNV). The temperature derating factor is not valid for nickel alloy, or stainless steel.

Tool Input

  • syutype : Stress Table Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • tfactype : Temperature Derating Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor

Tool Output

  • SMTS : Specified Minimum Tensile Stress
  • SMTS/SMYS : Tensile Stress Over Yield Stress Ratio
  • SMYS : Specified Minimum Yield Stress
  • SMYS/SMTS : Yield Stress Over Tensile Stress Ratio
  • Su : Derated Tensile Stress
  • Sy : Derated Yield Stress
  • T : Temperature Derating Factor
CALCULATOR : ASME B31.8 Section 842.2 Plastic Pipe Allowable Stress [FREE]   ±

Calculate allowable stress (SDf) for plastic piping (ASME B31.8 section 142.2).

The allowable stress equals the hydrostatic design basis (HDB) times the design factor (Df). SDf = HDB x Df.

Tool Input

  • satype : Allowable Stress Type
    • HDB : Hydrostatic Design Basis Stress
    • Dfu : User Defined Design Stress Factor
    • Sau : User Defined Allowable Stress

Tool Output

  • Sa : Allowable Stress
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