Calculate pipeline pressure resistance for complex defects with internal pressure load only (DNVGL-RP-F101 section 3.8 and section 4.5). Enter the defect dimensions as X, d (defect position, and depth) as a comma or tab separated list, or copy and paste from a spreadsheet. Each defect set (X,d) should be on a new line. The defect positions must be in ascending (increasing) order. The data points do not need to be evenly spaced.
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 depth increment are tabled at the bottom of the page. Normally 10 to 50 steps are adequate for the depth increment.
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
- 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
- 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
- pcorrtype : Pressure Resistance Type
- numsteps : Number Of Defect Steps
- Xdata : Defect 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
- ΔPl : Delta Pressure Across Pipe Wall At Local Elevation
- ΔPl/Pc : Pressure Difference Over Pressure Resistance Ratio
- αu : Material Strength Factor
- γinc : Incidental Pressure Factor
- γm : Model Prediction Safety Factor
- γs : System Effect Factor
- (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
- Ltot : Total Defect Length
- Pc : Pressure Resistance
- Pcap : Critical Defect Patch Pressure Capacity
- Ple : External Pressure At Local Elevation
- Pli : Incidental Pressure At Local Elevation
- Plid : Derated Incidental Pressure At Local Elevation
- Pmax : Pressure Resistance Of Maximum Defect
- Ppat : Critical Defect Patch Pressure Resistance
- Ppit : Critical Defect Pit Pressure Resistance
- 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
- Ptot : Total Pressure Resistance Total Length x Average Depth
- Q : Critical Defect Q Factor
- SMTS : Specified Minimum Tensile Stress
- StD : Standard Deviation
- aa : ± Absolute Sizing Accuracy
- dc : Critical Defect Depth
- di : Critical Defect Depth Increment
- fu : Ultimate Stress
- fut : Ultimate Derating Stress
- i : Critical Defect Increment
- ra : ± Relative Sizing Accuracy
- te : Critical Defect Equivalent Wall Thickness
- wd : Water Depth At Local Elevation