Calculate pipeline system test pressure and hoop stress check from design pressure and elevation (DNVGL-RP-F115 appendix C).
The local test pressure must be greater than or equal to the required local test at all points on the pipeline or pipeline system. The local test pressure must also be less than or equal to the mill test pressure. The minimum required mill test pressure for pipeline testing and operation is calculated from the local incidental pressure and local test pressure (there are additional requirements for the mill test pressure in DNVGL-ST-F101). Use the Result Plot option to plot the test pressure and hoop stress versus elevation.
Reference : DNVGL-ST-F101 : Submarine Pipeline Systems (Download from the DNVGL website)
Tool Input
- plitype : Local Internal 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
- ρf : Operating Fluid Density
- Zr : Reference Elevation
- Zl : Local Elevation
- pletype : Local External Pressure Type
- Pleu : User Defined Local External Pressure
- ρe : External Fluid Density
- Zs : Surface Elevation
- plttype : Local Test Pressure Type
- ρt : Test Fluid Density
- Zt : Test Point Elevation
- Prtu : User Defined Test Pressure At Reference Elevation
- Pttu : User Defined Test Pressure At Test Point Elevation
- Pltu : User Defined Test Pressure At Local Elevation
- syutype : Stress Table Type
- mattype : Material Strength Type
- SMYSu : User Defined Specified Minimum Yield Stress
- SMTSu : User Defined Specified Minimum Tensile Stress
- autypeo : Material Strength Factor Type For Operation
- schdtype : Pipe Schedule Type
- diamtype : Pipe Diameter Type
- ODu : User Defined Outside Diameter
- IDu : User Defined Inside Diameter
- wtntype : Wall Thickness Type
- tnu : User Defined Wall Thickness
- ttoltype : Wall Thickness Tolerance Type
- xfu : User Defined Negative Wall Thickness Fraction
- tfu : User Defined Negative Wall Thickness Allowance
- ginctype : Incidental Pressure Factor Type
- γincu : User Defined Incidental Pressure Factor
- gsctype : Safety Class Resistance Factor Type (Test Fluid Safety Class)
- γscu : User Defined Safety Class Resistance Factor
- apttype : Test Pressure Factor Type (Operation Fluid Safety Class)
- αmptu : User Defined Mill Pressure Test Factor
- αsptu : User Defined System Pressure Test Factor
- optype : Characteristic Wall Thickness Type
- ta : Corrosion Allowance
Tool Output
- ΔPlt : Delta Test Pressure Across Pipe Wall At Local Elevation
- Δz : Local Elevation Relative To Reference Elevation
- αmpt : Mill Test Pressure Factor
- αspt : System Test Pressure Factor
- αuo : Material Strength Factor For Operation
- αut : Material Strength Factor For Test
- γinc : Incidental Pressure Factor
- γm : Material Resistance Factor
- γsc : Safety Class Resistance Factor
- ID : Pipe Nominal Inside Diameter
- OD : Pipe Nominal Outside Diameter
- OD/t : Diameter Over Wall Thickness Ratio
- Pb : Burst Pressure
- Pd : Design Pressure At Reference Elevation
- Ple : External Pressure At Local Elevation
- Plhmin : Minimum Required Mill Test Pressure For Local Elevation
- Pli : Incidental Pressure At Local Elevation
- Plt : Test Pressure At Local Elevation
- Plt/Pltmin : Local Test Pressure Over Minimum Local Test Pressure Ratio (≥ 1)
- Pltmin : Minimum Required System Test Pressure At Local Elevation
- Pri : Incidental Pressure At Reference Elevation
- Prt : Test Pressure At Reference Elevation
- Ptt : Test Pressure At Test Point Elevation
- SMTS : Specified Minimum Tensile Stress
- SMYS : Specified Minimum Yield Stress
- Sh : Hoop Stress
- Sh/fca : Hoop Stress Over Allowable Stress Ratio (≤ 1)
- fca : Allowable Hoop Stress
- fcb : Burst Stress
- fu : Ultimate Stress
- fy : Yield Stress
- t : Pressure Design Wall Thickness
- t1 : Wall Thickness t1
- tf : Fabrication Allowance
- tfx : Fabrication Fraction
- tm : Minimum Wall Thickness
- tn : Pipe Nominal Wall Thickness
- wd : Water Depth At Local Elevation