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DNVGL-ST-F101: Code Check
Horizontal Directional Drilling Analysis
ASME B31: Code Compliance
API RP 1102: Code Check
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User Manual - HDD Analyser
Horizontal Directional Drilling
Design Calculation
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HDD - Input Parameters
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Pipe parameter
Pipe steel outside diameter
D
s
mm
Pipe steel wall thickness
t
s
mm
Pipe internal corrosion allowance
CA
mm
Select Material Grade
Others
API 5L Gr. B
API 5L Gr. X-42
API 5L Gr. X-46
API 5L Gr. X-52
API 5L Gr. X-56
API 5L Gr. X-60
API 5L Gr. X-65
API 5L Gr. X-70
API 5L Gr. X-80
DNV-OS-F101 245
DNV-OS-F101 290
DNV-OS-F101 320
DNV-OS-F101 360
DNV-OS-F101 390
DNV-OS-F101 415
DNV-OS-F101 450
DNV-OS-F101 485
DNV-OS-F101 555
Specified minimum yield strength of steel
SMYS
MPa
Pipeline steel density
ρ
s
kg/m
3
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/m
3
External coating thickness [2nd coat]
t
coat2
mm
External coating density [2nd coat]
ρ
coat2
kg/m
3
Design parameters
Design pressure of pipeline
P
d
MPa
Minimum hydrostatic test pressure of pipeline
P
h
MPa
Design temperature of pipeline (buried)
T
d
o
C
Ambient temperature of pipeline (installation)
T
amb
o
C
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/m
2
Density of bentonite in the hole
ρ
bent
kg/m
3
Maximum Allowable Stress Percentages
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
Drilling profile
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
Parameters for maximum permissible overburden on pipe
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/m
3
Density of water column above pipe
ρ
water
kg/m
3
Buoyancy control parameters
Apply buoyancy control to reduce pulling load
True
Water-filled Pipe Method
Pipe-in-Pipe Method
Pipe-in-pipe details
Pipe-in-pipe diameter
D
mm
Pipe-in-pipe wall thickness
t
mm
Pipe-in-pipe material density
ρ
kg/m
3
Density of fluid/water to be filled
ρ
fluid
kg/m
3
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