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ASME B31G Pipe Corrosion Defect

Calculate ASME B31G piping level 0 corrosion defect assessment for blunt defects (corrosion defects or other defects).

The level 0 assessment is useful as a screening check. The allowable defect length is calculated from the maximum defect depth. The calculation is taken from ASME B31G 1999 (original ASME B31G). The level 0 check is suitable for blunt defects of all types, including corrosion, mechanical damage and grinding repairs etc. For crack type defects the NG-18 crack defect calculators are recommended. The RSTRENG method (effective area method) can also be used for blunt type defects. The temperature derating calculation is from ASME B31.8. Material specific test data should be used if it is available.

Defects failing the level 0 check should be checked with a level 1 or level 2 assessment (see module links below). Use the level 1 assessment for simple defects from defect length and depth using either the original ASME B31G equation, or the modified ASME B31G equation. Use the level 2 assessment for complex defects from the defect river bottom profile.

Reference : ANSI/ASME B31G Manual For Determining The Remaining Strength Of Corroded Pipelines (2012)

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CALCULATOR : ASME B31G Section 2.1 Level 0 Corrosion Defect Screening Assessment [FREE]   ±

Calculate the level 0 defect assessment and allowable defect length from the maximum defect depth (ASME B31G section 2.1). The allowable defect length is based on the original B31G method. The level 0 assessment may be used as an initial screening assessment. Defects which fail the level 0 assessment require further assessment, or repair.

Tool Input

  • schdtype : Line Pipe Schedule Type
  • diamtype : Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • L : Defect Length
  • d : Defect Maximum Depth

Tool Output

  • B : Defect B Value
  • Ba : Defect Allowable B Value
  • ID : Pipe Inside Diameter
  • La : Defect Allowable Length
  • OD : Pipe Outside Diameter
  • d/t : Defect Depth Over Wall Thickness Ratio
  • t : Pipe Wall Thickness
  • tmin : Defect Minimum Remaining Wall Thickness

CALCULATOR : ASME B31G Pipe Diameter From Circumference [FREE]   ±

Calculate pipe outside diameter from circumference, or pipe circumference from outside diameter for ASME B31G.

Use either the nominal pipe diameter and wall thickness, or the measured pipe diameter and wall thickness for the ASME B31G checks.

Tool Input

  • odtype : Pipe Outside Diameter Measurement Type
    • ODu : Measured Outside Diameter
    • OCu : Measured Outside Circumference

Tool Output

  • OC : Pipe Outside Circumference
  • OD : Pipe Outside Diameter