HDD of Plastic Pipes | all about pipelines

Manual - HDD (Plastic Pipe)

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Outer diameter of pipe

Thickness of pipe (minimum)

Dimension ratio (DR = D/t)

Specific gravity of pipe material

γ_a -

Poisson's ratio of pipe material

Short term loading (μ_s)

Long term loading (μ_L)

Material of pipe

Time interval of pipe pull-back

Service life of pipe

Typical Safe Pull Stress

SPS

Short-term apparent modulus of elasticity

E_short

Long-term apparent modulus of elasticity

E_long

Maximum ovality of pipe (factory-made)

O_% %

Fig. Typical Horizontal Directional Drilling Crossing

Horizontal length of crossing

L_h

Max. depth of profile w.r.t RL

Angle of entry of pipe

α deg

Angle of exit of pipe

β deg

Curvature radius (pipe side)

Auto

R_i

Curvature radius (rig side)

Auto

R_o

Entry height w.r.t. RL

h_in

Exit height w.r.t. RL

h_out

Additional length of pipe for handling

L₁

Backreamed hole diameter

D_hole

Hydrokinetic pressure (during pipe pullback)

Δ P

Friction co-efficient of pipe at surface

ν_a -

Friction co-efficient of pipe downhole

ν_b -

Specific gravity of mud slurry

γ_b -

Safety factor (external collapse pressure)

N -

Specific gravity of soil

γ_soil -

Angle of internal friction of soil

φ_f deg

"Silo" width

Apply buoyancy control to reduce pulling load

True

Specific gravity of fluid/water to be filled

γ_fill -

Enter value between 0.1 - 3.0

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Horizontal Directional Drilling Plastic Pipe (HDPE & MDPE)

Plastic pipe parameter

Drilling profile

Fig. Typical Horizontal Directional Drilling Crossing

Other data

Parameters for earth load on pipe

Buoyancy control parameters