ANSI B31G Pipe Corrosion Defects Modules

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)

Change Module :

• ASME B31G Flow Stress Calculation Module
• ASME B31G Level 1 Defect Assessment Calculation Module
• ASME B31G Level 2 Defect Assessment Calculation Module
• All
• More Corrosion Modules

Calculate ASME B31G level 2 corrosion defect assessment for blunt type defects.

The level 2 assessment calculates the allowable pressure from the defect "river bottom" profile using the effective area method (also known as the RSTRENG method). Pressure derating is required if the allowable pressure is less than the maximum operating pressure.

The flow stress can be calculated as either 1.1 x SMYS, SMYS + 69 MPa, or 1/2 (SMYS + SMTS). For pipelines operating at high temperature, the SMYS and SMTS should be derated.

For submerged pipelines, or to calculate the allowable pressure at a reference elevation, use the level 1 and level 2 calculators including elevation. The allowable local pressure is calculated including external pressure (use the external pressure = 0 for dry pipelines). The allowable reference pressure is calculated from the local allowable pressure, and the relative elevation.

ASME B31G 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 effective area method can also be used for blunt defects.

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

Change Module :

• ASME B31G Flow Stress Calculation Module
• ASME B31G Level 1 Defect Assessment Calculation Module
• ASME B31G Pipe Corrosion Defect Calculation Module
• All

Related Modules :

• AGA NG18 Crack Defect Calculation Module
• DNVGL RP F101 Corrosion Line Pipe Schedule Calculation Module
• PRCI PR 3805 RSTRENG Calculation Module
• More Corrosion Modules