Horizontal Directional Drilling Calculator

User Manual - HDD Analyser

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Pipe steel outside diameter

D_s mm

Pipe steel wall thickness

t_s mm

Pipe internal corrosion allowance

CA mm

Select Material Grade

Specified minimum yield strength of steel

SMYS MPa

Pipeline steel density

ρ_s kg/m³

Young's Modulus of Elasticity of steel

E_s MPa

Poisson's ratio

ν --

External coating thickness [1st coat]

t_coat1 mm

External coating density [1st coat]

ρ_coat1 kg/m³

External coating thickness [2nd coat]

t_coat2 mm

External coating density [2nd coat]

ρ_coat2 kg/m³

Design pressure of pipeline

P_d MPa

Minimum hydrostatic test pressure of pipeline

P_h MPa

Design temperature of pipeline (buried)

T_d ^oC

Ambient temperature of pipeline (installation)

T_amb ^oC

Avg. co-efficient of friction between pipe & soil

μ_soil -

Avg. co-efficient of friction on roller support

μ_roller -

Distance between roller supports

L_roller m

Radius of overbend (pipe on conveyors)

R_o m

Drag co-efficient between pipe & bentonite mud

μ_mud N/m²

Density of bentonite in the hole

ρ_bent kg/m³

Maximum allowable longitudinal stress

F_L % SMYS

Combined equivalent stress [hydrotesting]

F_H % SMYS

Combined equivalent stress [operation]

F_O % SMYS

Safety factor for computed elastic bend radius

F_EBR times

Fig. Typical Horizontal Directional Drilling Crossing

Horizontal length of crossing

L_h m

Depth of crossing w.r.t RL

Depth m

Angle of entry

θ_in deg

Angle of exit

θ_out deg

Radius of curvature (pipe side)

R_in m

Radius of curvature (rig side)

R_out m

Entry height w.r.t. RL

h_in m

Exit height w.r.t. RL

h_out m

Height of soil column above pipe

H_soil m

Height of water column above pipe

H_water m

Density of soil column above pipe

ρ_soil kg/m³

Density of water column above pipe

ρ_water kg/m³

Apply buoyancy control to reduce pulling load

True

Water-filled Pipe Method

Pipe-in-Pipe Method

Pipe-in-pipe diameter

D mm

Pipe-in-pipe wall thickness

t mm

Pipe-in-pipe material density

ρ kg/m³

Density of fluid/water to be filled

ρ_fluid kg/m³

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Horizontal Directional Drilling Design Calculation

Pipe parameter

Design parameters

Maximum Allowable Stress Percentages

Drilling profile

Fig. Typical Horizontal Directional Drilling Crossing

Parameters for maximum permissible overburden on pipe

Buoyancy control parameters

Pipe-in-pipe details