Calculate pipeline pressure resistance for circumferential defects, and defects with comnined internal pressure and axial compressive load (DNVGL-RP-F101 section 3.7 and section 4.3).
The pressure reistance is calculated for pressure load only, combined pressure load and axial load (compression only), and circumferential defects (CSF compression only and where defect circumferential length > axial length). For other cases the pressure resitance for the combined pressure load and axial load, and the circumferentail defects is set equal to the pressure reistance for the pressure load only. The pressure resistance is the minimum of the three values (≥ 0). The pressure resistance can be calculated for either calibrated safety factor (CSF), or allowable stress design (ASD). The system effect factor is applied for both CSF and ASD models.
Tool Input
- pletype : Local External Pressure Type
- Pleu : User Defined External Pressure At Local Elevation
- ginctype : Incidental Pressure Factor Type
- γincu : User Defined Incidental Pressure Factor
- plitype : Local Incidental Pressure Type
- Prdu : User Defined Design Pressure At Reference Elevation
- Priu : User Defined Incidental Pressure At Reference Elevation
- Pliu : User Defined Incidental Pressure At Local Elevation
- syutype : Material Stress Type
- mattype : Material Type
- SMYSu : User Defined Specified Minimum Yield Stress
- SMTSu : User Defined Specified Minimum Tensile Stress
- autype : Material Strength Factor Type
- syttype : Temperature Derating Type
- fytu : User Defined Yield Stress Temperature Derating
- futu : User Defined Ultimate Stress Temperature Derating
- safetype : Safety Class Type
- εdu : User Defined Corrosion Depth Fractile Value
- γdu : User Defined Corrosion Depth Safety Factor
- γmu : User Defined Model Prediction Safety Factor
- γmcu : User Defined Circumferential Erosion Safety Factor
- ηu : User Defined Circumferential Erosion Safety Factor
- ξmu : User Defined Longitudinal Stress Usage Factor
- systype : System Effect Type
- nu : User Defined Number Of Defects
- γsu : User Defined System Effect Factor
- ffactype : Design Factor Type
- F1u : User Defined Operational Usage Factor F1
- pcorrtype : Pressure Resistance Type
- conftype : Confidence Level Type
- Cu : User Defined Confidence Level
- acctype : Sizing Accuracy Or Inspection Method Type
- rau : User Defined ± Relative Sizing Accuracy
- aau : User Defined ± Absolute Sizing Accuracy
- stdtype : Standard Deviation Calculation Type
- StDu : User Defined Standard Deviation
- ddtype : Defect Depth Type
- rdu : User Defined Relative Defect Depth
- adu : User Defined Absolute Defect Depth
- D : Pipe Outside Diameter
- tn : Pipe Wall Thickness
- L : Defect Length
- C : Defect Circumferential Width
- Td : Design Temperature
- σl : Pipe Wall Longitudinal Stress
- ρf : Operating Fluid Density
- ρe : External Fluid Density
- Zr : Reference Elevation
- Zl : Local Elevation
- Zs : Surface Elevation
Tool Output
- ΔPd : Design Pressure Delta Derating
- ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
- ΔPl/Pc : Pressure Difference Over Pressure Resistance Ratio
- αu : Material Strength Factor
- γd : Corrosion Depth Safety Factor
- γinc : Incidental Pressure Factor
- γm : Model Prediction Safety Factor
- γmc : Circumferential Defect Safety Factor
- γs : System Effect Factor
- εd : Corrosion Depth Fractile Value
- η : Circumferential Defect Safety Factor
- θ : Circumferential Defect Angle
- ξ : Longitudinal Stress Usage Factor
- (d/t) : Defect Depth Over Wall Thickness Ratio
- (d/t)* : Modified Defect Depth Over Wall Thickness Ratio
- Ar : Circumferential Defect Area Factor
- CL : Confidence Level
- F : Total Usage Factor
- Hc : Compressive Circumferential Stress Factor
- Hl : Compressive Longitudinal Stress Factor
- Pb : Burst Pressure
- Pc : Pressure Resistance
- Pca : Pressure Resistance Axial Load
- Pcc : Pressure Resistance Circumferential Defect
- Pcp : Pressure Resistance Pressure Only
- Ple : External Pressure At Local Elevation
- Pli : Incidental Pressure At Local Elevation
- Plid : Derated Incidental Pressure At Local Elevation
- Prd : Design Pressure At Reference Elevation
- Prdd : Derated Design Pressure At Reference Elevation
- Pri : Incidental Pressure At Reference Elevation
- Prid : Derated Incidental Pressure At Reference Elevation
- Q : Defect Q Factor
- SMTS : Specified Minimum Tensile Stress
- SMYS : Specified Minimum Yield Stress
- StD : Standard Deviation
- aa : ± Absolute Sizing Accuracy
- d : Defect Depth
- fu : Ultimate Stress
- fut : Ultimate Derating Stress
- fy : Yield Stress
- fyt : Yield Derating Stress
- ra : ± Relative Sizing Accuracy
- wd : Water Depth At Local Elevation
- σlmax : Maximum Allowable Longitudinal Stress (CSF Circumferential Defects Only)