Calculate pipeline pressure resistance for interacting defects with internal pressure load only (DNVGL-RP-F101 section 3.8 and section 4.4). Enter the defect dimensions as Xs, Xf, d (defect start position, finish position and depth) as a comma or tab separated list, or copy and paste from a spreadsheet. Each defect Xs,Xf,d set should be on a new line. The defect start positions must be in ascending (increasing) order.
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. Use the Result Plot option to plot the dimesionless defect (1-d/t versus X/L), and the critical defect. The results for each n, m, combination are tabled at the bottom of the page.
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
- SMTSu : User Defined Specified Minimum Tensile Stress
- autype : Material Strength Factor Type
- syttype : Temperature Derating Type
- 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
- 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
- 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
- pcorrtype : Pressure Resistance Type
- XSdata : X Defect Start Position
- XFdata : X Defect Finish Position
- ddata : Defect Depth
- D : Pipe Outside Diameter
- tn : Pipe Wall Thickness
- Td : Design Temperature
- ρf : Operating Fluid Density
- ρe : External Fluid Density
- Zr : Reference Elevation
- Zl : Local Elevation
- Zs : Surface Elevation
Tool Output
- ΔPd : Design Pressure Delta Derating
- ΔPli : Delta Pressure Across Pipe Wall At Local Elevation
- ΔPli/Pc : Pressure Difference Over Pressure Resistance Ratio
- αu : Material Strength Factor
- γd : Critical Corrosion Depth Safety Factor
- γinc : Incidental Pressure Factor
- γm : Model Prediction Safety Factor
- γs : System Effect Factor
- εd : Critical Corrosion Depth Fractile Value
- (d/t) : Critical Defect Depth Over Wall Thickness Ratio
- (d/t)* : Modified Critical Defect Depth Over Wall Thickness Ratio
- CL : Confidence Level
- F : Total Usage Factor
- Lc : Critical Defect Length
- Pb : Burst Pressure
- Pc : Pressure Resistance
- 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 : Critical Defect Q Factor
- SMTS : Specified Minimum Tensile Stress
- StD : Standard Deviation
- StDc : Critical Defect Standard Deviation
- aa : ± Absolute Sizing Accuracy
- dc : Critical Defect Depth
- fu : Ultimate Stress
- fut : Ultimate Derating Stress
- m : Critical Defect Start Index
- n : Critical Defect End Index
- ra : ± Relative Sizing Accuracy
- wd : Water Depth At Local Elevation