Pipeng Toolbox : ASME B31.8 Allowable Stress Calculators Blank User
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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 : ASME B31.8 Section 841.1 Pipeline Allowable Stress (Onshore) [FREE]   ±

Calculate allowable stress (SEFT) versus temperature for onshore pipelines (ASME B31.8 section 841.1).

The allowable stress equals the specified minimum yield stress (SMYS) times the weld quality factor (E) times the design stress factor (F) times the temperature reduction factor (T). SEFT = SMYS x E x F x T. 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 : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • efactype : Weld Joint Quality Factor Type
    • Eu : User Defined Quality Factor
  • tfactype : Temperature Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor
  • loctype : Location Class
    • Fu : User Defined Design Stress Factor
  • pipetype : Pipe Section Type

Tool Output

  • E : Weld Joint Factor
  • F : Design Stress Factor
  • SEFT : Allowable Stress
  • SMYS : Specified Minimum Yield Stress
  • Sy : Derated Yield Stress
  • T : Temperature Reduction Factor
CALCULATOR : ASME B31.8 Section A842.2 Pipeline Allowable Stress (Offshore) [FREE]   ±

Calculate allowable stress (SFT) versus temperature for offshore pipelines (ASME B31.8 section A842.2).

The allowable stress equals the specified minimum yield stress (SMYS) times the design stress factor (F) times the temperature reduction factor (T). SFT = SMYS x F x T. 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. For offshore pipelines, line pipe with a weld quality factor (E) = 1 should be used.

Tool Input

  • syutype : Line Pipe Stress Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • tfactype : Temperature Derating Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor
  • loctype : Location Class
    • Fu : User Defined Design Stress Factor

Tool Output

  • F : Design Stress Factor
  • SFT : Allowable Stress
  • SMYS : Yield Stress
  • Sy : Derated Yield Stress
  • T : Temperature Reduction 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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