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CALCULATOR MODULE : ASME B31.8 Gas Pipeline Maximum Allowable Operating Pressure ±
Calculate ASME B31.8 gas pipeline MAOP from the design pressure and the test pressure. The design pressure is the minimum value of allowable pressure at all points on the pipeline. If the design pressure is not known, use the hoop stress calculators to calculate the design pressure. Use the goal seek option to calculate the allowable pressure at the allowable stress at all points on the pipeline. The minimum value of allowable pressure is the design pressure. Use the pressure design wall thickness for the hoop stress calculations. The test pressure is the minimum value of the local test pressure at all points on the pipeline. If the minimum test pressure is not known (only the test pressure at the test location is known), use the test pressure calculators to calculate the local test pressure from the test pressure at the test location, at all points on the pipeline. Use the minimum value of local test pressure as the test pressure. Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018) Change Module : |
CALCULATOR MODULE : 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) Change Module : |
CALCULATOR MODULE : ASME B31G Level 1 Defect Assessment ±
Calculate ASME B31G level 1 corrosion defect assessment for blunt type defects. The level 1 assessment calculates the allowable pressure from the maximum defect depth and defect length, using either the original ASME B31G method (1999), or the modified ASME B31G 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 calculator 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 : Related Modules : |
CALCULATOR MODULE : ASME B31G Level 2 Defect Assessment ±
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 : Related Modules : |
CALCULATOR MODULE : AGA NG18 Level 1 Defect Assessment ±
Calculate AGA NG-18 level 1 crack defect assessment. The level 1 assessment calculates the allowable pressure from the maximum defect depth and defect length. 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 calculator 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. AGA NG-18 is suitable for crack defects. For blunt defects including corrosion, mechanical damage and grinding repairs etc the ASME B31G or RSTRENG calculators are recommended. Reference : AGA Pipeline Research Committee NG-18 Report 204 Ductile Fracture Properties of Selected Linepipe Steels Change Module : Related Modules : |
CALCULATOR MODULE : AGA NG18 Level 2 Defect Assessment ±
Calculate AGA NG-18 level 2 crack defect assessment. 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. AGA NG-18 is suitable for crack defects. For blunt defects including corrosion, mechanical damage and grinding repairs etc the ASME B31G or RSTRENG calculators are recommended. Reference : AGA Pipeline Research Committee NG-18 Report 204 Ductile Fracture Properties of Selected Linepipe Steels Change Module : Related Modules : |
CALCULATOR MODULE : PRCI PR 3805 RSTRENG ±
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 : |
CALCULATOR MODULE : PRCI PR 3805 RSTRENG Level 1 0.85 RSTRENG ±
Calculate the PR-3-805 RSTRENG level 1 (0.85 RSTRENG) corrosion defect assessment for blunt defects. Use the level 1 caculators to calculate the allowable pressure from the maximum defect depth and the defect length using the 0.85 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. 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. 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. Material test data should be used if it is available. 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 : Related Modules : |
CALCULATOR MODULE : PRCI PR 3805 RSTRENG Level 2 RSTRENG Method ±
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 : Related Modules : |
DATA MODULE : ASME B31 Pipe And Flange Dimension ( Open In Popup Workbook ) ±
ASME B31.8 gas pipe and flange data values: pipe dimensions, flange dimensions, cover requirements, cold bends, burn through and location class. Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems Related Modules : |