coastal management program environment & life sciences … optimum depth/101... ·...
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Dr. S. NEELAMANI & Dr. K. Al-BanaaSenior Research Scientist Asso. Research Scientist
Coastal Management ProgramEnvironment & Life Sciences Research Centre
Kuwait Institute for Scientific ResearchKUWAIT
Email: [email protected]
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Sea Bed
Sea Water Level
D e
Challenging Question: What is the Minimum safe Burial Depth of submarine pipelines?
d
Hi
L
Engineering & Hydraulic Properties of the soil
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Typical view of pipeline entering from land to sea
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Coastal pipelines during laying
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Offshore effluent pipeline deployed and ready for sinking into position (See the concrete collars for stability)
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Collar installation onto new offshore effluent outfall pipeline
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Typical cross section of a submarine pipeline with different forces acting on it
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8
ee
FD FI
FIFD
FL
FB
FC
FW FO
FP
FC
s c s c
FC
FW FS
FL
FB
ELEVATED PIPE LINE
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9
FL
FB
FL
FBFL
FB
FCFC
FWFW
FW
FD FI FD FIFD FI
Fs
BB
Fs
FpFs
Fps c s c s c
SURFACE or PARTIALLY BURIED PIPELINE
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10
FB
FB
FC
FC
FW
FW
s c s c
BURIED PIPELINE
FH
FV
FH
FV
Sea Bed
SWL SWL
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11
Sea bed
Armor rock Beam
Pile
Sea bed
Concrete saddle
Sea bed
Hold down strap
Sea bed
Ballasted pipe Pile supported pipe
Screw orExplosive Anchor
Stabilization methods for Exposed submarine pipeline
Pipe Saddle Pipe Anchor
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12
Sea bed
Trench wall
Jetted in pipeBuried pipe- Natural Fill
Armor rock
Back fill
Bedding Bedding
Tremie concrete
Buried pipe- Armor Cover Buried pipe- Concrete Cover
Stabilization Methods for buried Submarine pipeline
Natural fill
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MINIMUM SAFE BURIAL DEPTH OF SUBMARINE PIPELINE DEPENDS ON DESIGN WAVE CONDITION TYPE OF SEA BED MATERIAL ENVIRONMENTAL IMPACT OF FAILURE INITIAL COST MAINTENANCE COST ZONE CARGO RISK
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ARABIAN GULFKUWAIT
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Sabiya Coastal Soil, (k=0.412 mm/s)
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Al-Koot Coastal Soil, (k=0.286 mm/s)
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Shuaiba Coastal Soil, (k=1.84 mm/s)
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Al-Khiran Coastal Soil, (k=0.652 mm/s)
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Hydrodynamic parameter Range Unit
Wave period, T 1.0 – 3.0 with 0.2 s increment s
Wave height, Hi 0.05 – 0.3m with 0.05 m increment m
Water depth at the test section, d 0.45 m m
Pipeline burial depth, e 0.0, 0.1, 0.2, 0.3 and 0.4 m
Pipe dia, D 0.2 m
Wave length at the test section, L 1.491 – 6.089 m
Relative depth of burial, e/D 0.0, 0.5, 1.0, 1.5 and 2.0 Unitless
Hi/d 0.111 – 0.666 Unitless
Hi/L 0.008 – 0.125 Unitless
d/L 0.074 – 0.302 Unitless
kd 0.465 – 1.897 Unitless
D/L 0.033 – 0.134 Unitless
ka 0.103 – 0.422 Unitless
Ur 1.22 – 122.07 Unitless
Umax.SWL 0.121 – 0.828 m/s
Umax.Bed 0.048 – 0.653 m/s
KC 0.241 – 9.798 Unitless
Re 9652.54 – 130642.0 Unitless
The Range of input and normalized hydrodynamic parameters
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Soil Property UnitSoil location
Sabiya Al-Koot Shuaiba Al-KhiranD10 mm 0.380 0.250 0.410 0.250D30 mm 0.570 0.275 0.570 0.275D50 mm 1.450 0.295 0.950 0.310D60 mm 1.700 0.310 1.500 0.330Cu Unitless 4.470 1.240 3.660 1.320
Cc Unitless 0.500 0.976 0.528 0.917
Bulk density t/m3 1.560 1.550 1.621 1.792Saturated density t/m3 1.850 1.855 1.948 2.130
Submerged density t/m3 0.811 0.815 0.815 1.090Porosity Unitless 0.290 0.360 0.908 0.339
Hydraulic Conductivity, k mm/s 0.412 0.286 1.840 0.652Angle of shearing resistance,
ΦDegree 31.460 32.110 32.110 27.010
Coefficient of friction, tan Φ Unitless 0.612 0.628 0.628 0.510
Passive earth pressure coefficient of the soil, Kp
Unitless 3.183 3.269 3.269 2.664
Remarks - Well graded
Uniformly graded
Almost well graded soil
Uniformly graded
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Horizontal wave forces on the submarine pipe for
e/D = 0.0, 0.5, 1.0, 1.5 and 2.0 respectively
(Hi = 0.2 m, and T = 2.0 s, Hydraulic conductivity,
k=0.652 mm/s).
Incident wave
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Vertical wave forces on the submarine pipe for e/D = 0.0, 0.5, 1.0, 1.5
and 2.0 (Hi = 0.2 m, and T = 2.0 s,Hydraulic conductivity,
k=0.652 mm/s).
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The locus of the resultant wave force on the submarine pipeline for different e/D, Hi=0.15 m and T=3.0 s in a soil with high hydraulic conductivity of 1.84 mm/s
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Effect of relative burial depth of submarine pipeline on shoreward force coefficients for four different soil types (Hi/d=0.666, d/L=0.074)
k=0.29 mm/s
k=1.84 mm/s
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Effect of relative burial depth of submarine pipeline on seaward force coefficients for four different soil types (Hi/d=0.666, d/L=0.074).
k=1.84 mm/s
k=0.29 mm/s
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Effect of relative burial depth of submarine pipeline on downward force coefficients for four different soil types (Hi/d=0.666, d/L=0.074).
k=0.29 mm/s
k=1.84 mm/s
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Effect of relative burial depth of submarine pipeline on uplift force coefficients for four different soil types (Hi/d=0.666, d/L=0.074).
k=1.84 mm/s
k=0.29 mm/s
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Workout ExampleInput conditions:Steel Pipe; OD: 1.0 m; Wall Thickness:15 mmWater depth: 2.25 m; Wave period: 6.7 s; Design wave height: 1.6 m.Soil Type: Four different marine soils discussed
in this paperPipe line purpose: Crude oil transportFind:a. Minimum safe burial depthb. Surcharge required for stability for any
selected depth of burial
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Location e/D FSUplift MinimumSafe e/DValue toPreventVerticalPop-up
FSHorizontal
Sliding
MinimumSafe e/DValue toPreventHorizontal Sliding
MinimumSafe e/DValueConsidering BothVerticalandHorizontal Stability
Was forFSUplift of1.5 (t/m)
Was forFSHorizontal
Sliding of1.5 (t/m)
MinimumWas forSatisfyingBothFSUpliftandFSHorizontal
Sliding of1.5 (t/m)
Sabiya(k=0.41 mm/s)
0 1.04e/D
between 1.5 and
2.0
0.02e/D in
between 0.5 and
1.0
e/D between 1.5 and
2.0
0.42 1.10 1.100.5 0.87 1.13 0.68 0.09 0.681.0 0.94 10.96 0.62 0.0 0.621.5 1.34 26.02 0.17 0.0 0.172.0 1.97 101.80 0.0 0.0 0.0
Al-Koot(k=0.29 mm/s)
0 1.04e/D bit more
than 1.5
0.02e/D in
between 0.5 and
1.0
e/D bit more
than 1.5
0.42 1.10 1.100.5 0.78 0.71 0.87 0.17 0.871.0 0.98 19.82 0.54 0.0 0.541.5 1.44 85.08 0.06 0.0 0.062.0 2.05 230.83 0.0 0.0 0.0
Shuaiba(k=1.84 mm/s)
0 1.04e/D
between 1.5 and
2.0
0.02
e/D=0.5
e/D between 1.5 and
2.0
0.42 1.10 1.100.5 1.01 1.64 0.46 0.0 0.461.0 0.96 13.12 0.58 0.0 0.581.5 1.42 31.87 0.08 0.0 0.082.0 2.07 78.25 0.0 0.0 0.0
Al-Khiran(k=0.65 mm/s)
0 1.04
e/D = 1.5
0.02
e/D=0.5 e/D = 1.5
0.42 1.10 1.100.5 0.92 1.54 0.60 0.0 0.601.0 1.01 13.77 0.51 0.0 0.511.5 1.53 40.96 0.0 0.0 0.02.0 2.33 85.14 0.0 0.0 0.0
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Conclusions An attempt is made to solve the question “What isthe optimum burial depth of submarinepipeline?”
Solution is derived for Four different soil typeswith hydraulic conductivity in the range of 0.286to 1.84 mm/s and forwide input wave conditions.
The results can be used to estimate the optimumdepth of burial of submarine pipelines for futureprojects in Kuwait and other countries.
For Kuwaiti marine condition and for a crude oilsteel pipe of 1.0 m dia and 15 mm wall thickness,the optimumdepth of burial is 1.5 m to 2.0 m.
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Acknowledgements Kuwait Foundation for Advancement of Science and Kuwait Pipe Industries and Oil Services Company (K.S.C) for sponsoring this R&D work.
Kuwait Institute for Scientific Research for the infrastructure and logistic support.
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