Calculate pipeline walking length for short high pressure, high temperature multi layer flowlines using the Pipeng simplified method.
Pipe walking is calculated from the movement of the pipe down stream anchor point during startup and shutdown cycling using a simple linear friction model. The startup transient temperature is calculated from the internal heat transfer coefficient only (the pipe and external heat transfer coefficients are ignored). The steady state temperature is calculated using the pipe and external heat transfer coefficients.
Refer to the pipe walking reference file (pdf) for more details.
Tool Input
- schdtype : Line Pipe Schedule Type
- diamtype : Line Pipe Diameter Type
- ODu : User Defined Outside Diameter
- IDu : User Defined Inside Diameter
- wtntype : Line Pipe Wall Thickness Type
- tnu : User Defined Wall Thickness
- flowtype : Fluid Flow Type
- Qfu : User Defined Volume Flow Rate
- Mfu : User Defined Mass Flow Rate
- Vfu : User Defined Fluid Velocity
- wltype : Pipe Unit Weight Type
- hrstype : Pipe Heat Resistance Type
- sectype : Cross Section Type
- OODu : User Defined Outer Diameter Including Coatings)
- EAu : User Defined Pipe E x A
- EAαu : User Defined Pipe E x A x alpha
- νu : User Defined Pipe Poisson's Ratio
- Rou : User Defined Steady State Total Thermal Resistance
- Rtu : User Defined Transient Total Thermal Resistance
- Wu : User Defined Pipe Total Weight Per Length
- lctype : Decay Length Type
- Lou* : User Defined Steady State Decay Length
- Ltu* : User Defined Transient Decay Length
- Tou* : User Defined Steady State Decay Time
- Ttu* : User Defined Transient Decay Time
- nfltype : Soil Pipe Friction Type
- Fu : User Defined Soil Friction Force Per Unit Length
- μeu : User Defined Equivalent Friction Factor
- WTi : Pipe Liner Wall Thickness
- ρi : Pipe And Liner Density
- Ki : Pipe And Liner Thermal Conductivity
- Ei : Pipe And Liner Elastic Modulus
- αi : Pipe And Liner Thermal Expansion Coefficient
- νi : Pipe And Liner Poisson's Ratio
- WTo : Pipe Coating Wall Thickness
- ρo : Pipe Coating Density
- Ko : Pipe Coating Thermal Conductivity
- X : Position Along Pipe
- L : Pipeline Length
- Ti : Inlet Temperature
- Ta : Ambient Temperature
- Pi : Internal Pressure
- Nin : Installation Load
- ρf : Fluid Density
- ρb : External Fluid Density
- Cpf : Fluid Specific Heat Capacity
- Kf : Internal Fluid Thermal Conductivity
- μf : Internal Fluid Dynamic Viscosity
- H : Soil Cover Height To Top Of Pipe
- Ks : Soil Heat Conductivity
- Su : Soil Undrained Shear Stress
- ws : Soil Installed Specific Weight
- Kso : Soil Earth Pressure Factor
- μs : Soil Pipe Axial Friction Factor
Tool Output
- ΔT : Delta Temperature
- μe : Equivalent Axial Friction Factor
- ν : Pipe Poisson Ratio
- Ai : Steady State Inlet Anchor Point
- Ao : Steady State Outlet Anchor Point
- EA : Pipe E x A
- EAα : Pipe Expansion Modulus
- F : Friction Force Per Length
- IID : Pipe Inside Diameter Including Liner
- Lo* : Steady State Temperature Decay Length
- Lsi : Operating Inlet Slip Length
- Lso : Operating Outlet Slip Length
- Lt* : Transition Temperature Decay Length
- Nfo : Operating Friction Axial Load At X
- Ngo : Operating Fully Restrained Axial Load At X
- Ngt : Transition Fully Restrained Axial Load At X
- OD : Line Pipe Diameter
- OD/tn : Line Pipe Diameter Over Wall Thickness Ratio
- OOD : Pipe Outer Diameter Including Coatings
- Rfi : Internal Film Thermal Resistance
- Ro : Operating Total Thermal Resistance
- Rp : Pipe Thermal Resistance
- Rs : Soil Thermal Resistance
- Rt : Transient Total Thermal Resistance
- To* : Operating Temperature Decay Time
- Too : Operating Outlet Temperature
- Tot : Transient Outlet Temperature
- Tt* : Transient Temperature Decay Time
- Txo : Operating Temperature At X
- Txt : Transition Temperature At X
- X1 : Expansion Length First Cycle
- X2 : Expansion Length Following Cycles
- cvg : Convergence Check
- maf : Fluid Mass Flow Rate
- mlb : Buoyancy Unit Mass
- mlc : Contents Unit Mass
- mlp : Pipe Unit Mass Including Liner And Coating
- nfo : Oulet Anchor Operating Friction Load
- ngo : Oulet Anchor Operating Restrained Load
- ngt : Oulet Anchor Transient Restrained Load
- tn : Line Pipe Thickness
- ut : Operating Overall Thermal Transfer Coefficient
- utt : Transient Overall Thermal Transfer Coefficient
- vef : Fluid Velocity
- vof : Fluid Volume Flow Rate
- wl : Pipe Weight Per Length