DNVGL-RP-F109 Self Burial Calculators

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DNVGL RP F109 Piping And Self Burial

Calculate DNVGL RP-F109 piping and pipeline self burial in non cohesive soils.

Piping occurs with mobile, non cohesive sandy seabeds due to the flow around and underneath the pipe. Self burial is self limiting as the flow reduces with burial depth. The equilibrium burial depth is calculated. The Shields number can be used to check the onset of seabed instability. Self burial is a gradual process which occurs over a period of time. Self burial should be calculated using a sea state significantly smaller than the maximum design sea state.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

Calculate pipe self burial depth due to piping for a pipeline resting on a sandy seabed (DNVGL-RP-F109 section 3.4.6).

For load reduction calculations, the burial depth used should not be greater than 0.2 OOD.

Tool Input

hwtype : Wave Heading Type
- Φwu : User Defined Wave Relative Heading
hctype : Current Heading Type
- Φcu : User Defined Current Relative Heading
sfactype : Shape Factor Type
- su : User Defined Spreading Factor
rdtype : Velocity Reduction Factor Type
- Rwu : User Defined Wave Reduction Factor
- Rcu : User Defined Current Reduction Factor
roughtype : Seabed Roughness Type
- zou : User Defined Seabed Roughness
uctype : Current Velocity Type
gatype : Gamma Factor Type
- γu : User Defined Gamma
muttype : Wave Velocity And Period Type
- Usu : User Defined Seabed Significant Wave Velocity
- Tzu : User Defined Seabed Zero Upcrossing Wave Period
OOD : Pipe Outer Diameter Including Coatings
γ : Soil Dry Unit Weight
ϕ : Soil Friction Angle
ρw : Seawater Density
Ur : Reference Current Velocity
Zr : Reference Height Above Seabed
d : Water Depth
Hs : Wave Significant Height
Tp : Peak Wave Period

Tool Output

Φrc : Relative Current Heading
Φrw : Relative Wave Heading
γ : Gamma Peak Enhancement Factor
Cy : Horizontal Force Coefficient
Fy : Horizontal Force
Kc : Keulegan Carpenter Number
M : Steady To Oscillating Velocity Ratio
Rdc : Current Velocity Reduction Factor
Rdw : Wave Velocity Reduction Factor
Tz : Zero Upcrossing Period
Uc : Reduced Current Velocity
Ur : Reduced Wave And Current Combined Velocity
Us : Reduced Wave Significant Velocity
cvg : Convergence Factor
ro : Seabed Roughness
sf : Wave Spreading Factor
zpp : Piping Burial Depth
zpp/OOD : Piping Burial Depth Over Pipe Diameter Ratio

DNVGL RP F109 Piping And Self Burial

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