Subsea Pipeline Lay Radius

Calculate subsea pipeline minimum lay radius from soil friction and lay tension.

The lay radius is limited by the lateral friction resistance at the pipeline laydown point.

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Subsea Pipeline Lay Catenary Calculation Module
Subsea Pipeline Seabed Embedment Calculation Module
Subsea Pipeline Submerged Weight Calculation Module
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Links : ±

CALCULATOR : Subsea Pipeline Submerged Weight From Mass [FREE] ±

Calculate pipe submerged weight and specific gravity from pipe mass.

Pipe diameter can be defined from other diameter and wall thickness, inner diameter and wall thickness, or outer and inner diameter. The pipe mass should include the mass of all the pipe layers, and excluding contents. The contents mass and buoyancy mass are calculated. To avoid flotation the pipe specific gravity should be ≥ 1.1.

Tool Input

diamtype : Line Pipe Diameter Type
- OODu : User Defined Outer Diameter Including Layers
- IIDu : User Defined Inner Diameter Including Layers
- WTu : User Defined Total Pipe Thickness Including Layers
wltype : Pipe Weight Type
- Mu : User Defined Total Pipe Mass Including Layers
- wu : User Defined Submerged Weight
- SGu : User Defined Specific Gravity
ρf : Contents Fluid Density
ρb : Displaced Fluid Density

Tool Output

IID : Pipe Inner Diameter Including Liners
OOD : Pipe Outer Diameter Including Coatings
SG : Pipe Specific Gravity Relative To Displaced Fluid
WT : Pipe Total Wall Thickness Including Liners
w : Pipe Total Weight Per Length Including Contents and Buoyancy

CALCULATOR : Subsea Pipeline Submerged Weight (Multi Layer Pipe) [FREE] ±

Calculate pipe submerged weight and specific gravity relative to the displaced fluid (seawater) from pipe layer thickness and density.

For multi layer pipes the first inside layer is the line pipe wall. The line pipe wall thickness can either be selected from the line pipe schedule, or the value entered is used as the user defined wall thickness. For outside layers the wet density should be used. To avoid flotation the pipe specific gravity should be ≥ 1.1 (empty and full).

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
wltype : Pipe Weight Type
WTi : Pipe Liner Wall Thickness
ρi : Pipe And Liner Density
WTo : Pipe Coating Wall Thickness
ρo : Pipe Coating Density
ρf : Contents Fluid Density
ρb : Displaced Fluid Density

Tool Output

IID : Pipe Inner Diameter Including Liners
OD : Line Pipe Nominal Diameter
OOD : Pipe Outer Diameter Including Coatings
SG : Pipe Specific Gravity Relative To Displaced Fluid
mb : Displaced Fluid Mass Per Length
mc : Contents Fluid Mass Per Length
mi : Inner Layers Total Unit Mass
mo : Outer Layers Total Unit Mass
mp : Pipe Mass Per Length Including Liner And Coating
tn : Line Pipe Nominal Wall Thickness
w : Pipe Total Weight Per Length Including Contents and Buoyancy

CALCULATOR : Subsea Pipeline Lay Tension And Lay Radius (Multi Layer Pipe) [PLUS] ±

Calculate maximum lay tension from lay radius, or minimum lay radius from lay tension for a pipeline resting on a sand, clay or rock seabed.

For sand and clay seabeds the pipe is assumed to penetrate into the seabed due to self weight. The passive resistance is due to the seabed pentration. The penetration depth for rock is assumed to be zero. Normally the pipeline will be empty during installation.

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
wltype : Pipe Weight Type
- OODu : User Defined Outer Diameter Including External Coating
- wu : User Defined Submerged Weight
- SGu : User Defined Specific Gravity
soiltype : Soil Type
- ssu : User Defined Clay Undrained Shear Strength
- γs : User Defined Clay Dry Weight Per Voluime
- γs' : User Defined Sand and Rock Submerged Weight Per Volume
frictype : Friction Type
- μu : User Defined Friction Factor
sfactype : Safety Factor Type
- Su : User Defined Safety Factor
loadtype : Load Type
- Ru : User Defined Lay Radius
- Hu : User Defined Lay Tension
WTi : Pipe Liner Wall Thickness
ρi : Pipe And Liner Density
WTo : Pipe Coating Wall Thickness
ρo : Pipe Coating Density
ρf : Contents Fluid Density
ρb : Displaced Fluid Density

Tool Output

μ : Soil Friction Factor
Fr : Passive Soil Resistance
H : Lay Tension
OOD : Pipe Outer Diameter Including Coatings
R : Lay Radius
SF : Safety Factor
SG : Pipe Specific Gravity Relative To Displaced Fluid
Ws : Pipe Total Weight Per Length Including Contents and Buoyancy
zpi : Soil Penetration Depth
zpi/OOD : ZoD Ratio