PRCI PR 3805 RSTRENG Pipe Corrosion Modules

Calculate PR-3-805 RSTRENG 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 the 0.85 RSTRENG equation. Use the level 2 assessment for complex defects from the defect river bottom profile using the RSTRENG method or effective area method.

Reference : PRCI, Pipeline Research Committee Project, PR-3-805, “A Modified Criterion for Evaluating the Remaining Strength of Corroded Pipe,” December 22, 1989, PRCI PR-3-805 (R-STRENG) With RSTRENG Disk.

Change Module :

• PRCI PR 3805 RSTRENG Flow Stress Calculation Module
• PRCI PR 3805 RSTRENG Level 1 0.85 RSTRENG Calculation Module
• PRCI PR 3805 RSTRENG Level 2 RSTRENG Method Calculation Module
• All
• More Corrosion Modules

Calculate the PR-3-805 RSTRENG level 2 (RSTRENG Method) corrosion defect assessment for blunt defects.

Use the level 2 calculators to calculate 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 measured pipe diameter and wall thickness should be used in the calculations.

The calculators which include elevation can be used to include external pressure, and to calculate the allowable pressure at a reference elevation (for Example to calculate the allowable pressure at the pressure control location). Set the external pressure = 0 for dry pipelines.

For pipelines operating above 120 C the yield stress and ultimate stress should be derated . Use the stress derating calculator if test data is not available. Test data should be used if it is available.

PR-3-805 RSTRENG is suitable for blunt corrosion defects and mechanical damage defects (eg from grinding). ASME B31G is also suitable for blunt defects. AGA NG-18 is suitable for crack type defects. Flow stress can be calculated using either the RSTRENG equation, or the ASME equation.

Reference : PRCI, Pipeline Research Committee Project, PR-3-805, “A Modified Criterion for Evaluating the Remaining Strength of Corroded Pipe,” December 22, 1989, PRCI PR-3-805 (R-STRENG) With RSTRENG Disk.

Change Module :

• PRCI PR 3805 RSTRENG Calculation Module
• PRCI PR 3805 RSTRENG Flow Stress Calculation Module
• PRCI PR 3805 RSTRENG Level 1 0.85 RSTRENG Calculation Module
• All

Related Modules :

• AGA NG18 Crack Defect Calculation Module
• ASME B31G Pipe Corrosion Defect Calculation Module
• DNVGL RP F101 Corrosion Line Pipe Schedule Calculation Module
• More Corrosion Modules