Calculate pipeline longitudinal stress from pipe wall load and bending moment (DNVGL-RP-F101 section 3.7). The effective axial load and wall load can be calculated from the pipeline temperature and pressure, or can be user defined.
Reference : DNVGL-OS-F101 : Submarine Pipeline Systems (Download from the DNVGL website)
Tool Input
- pletype : External Pressure Type
- Pleu : User Defined External Pressure At Local Elevation
- plitype : Internal Pressure Type
- Priu : User Defined Internal Pressure At Reference Elevation
- Pliu : User Defined Internal Pressure At Local Elevation
- schdtype : Line Pipe Schedule Type
- diamtype : Diameter Type
- ODu : User Defined Outside Diameter
- IDu : User Defined Inside Diameter
- wtntype : Wall Thickness Type
- tnu : User Defined Wall Thickness
- modptype : Pipe Material Type
- νu : User Defined Pipe Poisson's Ratio
- Eu : User Defined Pipe Elastic Modulus
- αu : User Defined Pipe Thermal Expansion Coefficient
- sectype : Cross Section Type
- Asu : User Defined Steel Cross Section Area
- Iu : User Defined Pipe Second Area Moment
- EAαu : User Defined Pipe E x A x alpha
- loadtype : Load Type
- Fau : User Defined Effective Axial Load
- Fwu : User Defined Pipe Wall Axial Load
- Td : Design Temperature
- Tin : Installation Temperature
- H : Installation Load
- ρf : Internal Fluid Density
- ρe : External Fluid Density
- Zr : Reference Elevation Relative To Datum
- Zl : Local Elevation Relative To Datum
- Zs : Surface Elevation Relative To Datum
- Msd : Bending Moment
Tool Output
- ΔPl : Pressure Difference Across Pipe Wall
- α : Pipe Thermal Expansion Coefficient
- ν : Pipe Poisson's Ratio
- σa : Axial Stress
- σb : Bending Stress
- σl+ : Longitudinal Stress +ve Bending
- σl- : Longitudinal Stress -ve Bending
- As : Steel Cross Section Area
- E : Pipe Elastic Modulus
- EAα : Pipe E x A x alpha
- Fa : Effective Axial Force
- Fw : Pipe Wall Force
- ID : Nominal Inside Diameter
- Is : Steel Second Area Moment
- OD : Nominal Outside Diameter
- OD/tn : Nominal Diameter Over Wall Thickness Ratio
- Ple : External Pressure
- Pli : Internal Pressure
- tn : Nominal Wall Thickness