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ASME B31G Level 1 Defect Assessment Calculation
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 RSTRENG method (effective area method) can also be used for blunt type defects. Reference : ANSI/ASME B31G Manual For Determining The Remaining Strength Of Corroded Pipelines Modules :
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CALCULATOR : ASME B31G Section 2.2 Level 1 Corrosion Defect Assessment [Pipeng Plus] details
Calculate the level 1 corrosion assessment and allowable pressure from the corrosion length and depth (ASME B31G section 2.2). Elevation is ignored. Use the level 2 assessment for defects which have failed the level 1 assessment. Tool Input- checktype : ASME B31G Check Type
- d : Defect Depth
- L : Defect Length
- mattype : Material Type
- OCu : Measured Outside Circumference
- ODu : Measured Outside Diameter
- odtype : Pipe Outside Diameter Measurement Type
- SFu : User Defined Safety Factor
- sfactype : Safety Factor Type
- sflowtype : Flow Stress Type
- Su : User Defined Flow Stress
- SMTSu : User Defined Specified Minimum Tensile Stress
- SMYSu : User Defined Specified Minimum Yield Stress
- t : Measured Wall Thickness
Tool Output- M : Defect z Value
- OD : Pipe Outside Diameter
- Pa : Maximum Allowable Pressure
- Pb : Burst Pressure
- Pf : Failure Pressure
- S : Flow Stress
- SF : Safety Factor
- SMTS : Specified Minimum Tensile Stress
- SMTS/SMYS : Tensile Stress Over Yield Stress Ratio
- SMYS : Specified Minimum Yield Stress
- Z : Defect Z Factor
- d/t : Defect Depth Over Wall Thickness Ratio
- tmin : Minimum Remaining Wall Thickness
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CALCULATOR : ASME B31G Section 2.2 Level 1 Corrosion Defect Assessment Including Elevation [Pipeng Plus] details
Calculate the level 1 corrosion assessment, local allowable pressure and reference allowable pressure from the corrosion and depth (ASME B31G section 2.2). The external pressure can be calculated from elevation, or user defined. For dry pipelines use the external pressure = 0 option. The local allowable pressure includes the external pressure. The reference allowable pressure is calculated from elevation. Use the level 2 assessment for defects which have failed the level 1 assessment. Tool Input- checktype : ASME B31G Check Type
- d : Defect Depth
- L : Defect Length
- mattype : Material Type
- ρe : External Fluid Density
- ρf : Internal Fluid Density
- OCu : Measured Outside Circumference
- ODu : Measured Outside Diameter
- odtype : Pipe Outside Diameter Measurement Type
- Pleu : User Defined Local External Pressure
- pletype : External Pressure Type
- plitype : MOP Pressure Type
- SFu : User Defined Safety Factor
- sfactype : Safety Factor Type
- sflowtype : Flow Stress Type
- Su : User Defined Flow Stress
- SMTSu : User Defined Specified Minimum Tensile Stress
- SMYSu : User Defined Specified Minimum Yield Stress
- t : Measured Wall Thickness
- Zl : Local Elevation Relative To Datum
- Zr : Reference Elevation Relative To Datum
- Zs : Surface Elevation Relative To Datum
Tool Output- M : Defect z Value
- OD : Pipe Outside Diameter
- Pb : Burst Pressure
- Pf : Failure Pressure At Local Elevation
- Pla : Allowable Pressure Local Elevation
- Ple : External Pressure At Local Elevation
- Pra : Allowable Pressuure At Reference Elevation
- S : Flow Stress
- SF : Safety Factor
- SMTS : Specified Minimum Tensile Stress
- SMTS/SMYS : Tensile Stress Over Yield Stress Ratio
- SMYS : Specified Minimum Yield Stress
- Z : Defect Z Factor
- d/t : Defect Depth Over Wall Thickness Ratio
- tmin : Minimum Remaining Wall Thickness
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