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Gela - Malta Project
April 2009
2
Basis and Criteria of the Study
Results
Budgetary Estimate Summary
3
SUMMARY OF THE STUDY
The study represents an updating of a previous evaluation performed in 2002 and is based on the following requirements:
Malta shore approach at Delimara,
Export pressure = 54 barg
Minimum delivery pressure = 39 barg,
Flowrate scenario:
Max Peak = 106570 Sm3/h
The hydraulic study performed according to the same approach adopted in 2002 leads to the definition of the following pipeline diameter
OD = 18”
The expected accuracy of the estimate is ± 20%
4
Basic Data
5
Gas Composition and Characteristics
Equation of State = PR Peneloux
Gas Composition
Component Mol%
Methane 86.7854
Ethane 6.2315
Propane 1.4872
i-Butane 0.2707
n-Butane 0.4140
i-Pentane 0.1305
n-Pentane 0.1080
Exane 0.0375
Eptane 0.0053
Nitrogen 4.1520
Carbon Dioxide 0.3711
Water 0.0068
Total 100.0000
Gas Characteristic
@ STD Conditions: 1.013bar, 15°C
Value
Gas Molecular Weight (kg/kmol) 18.39
Gas Density (kg/m3) 0.779
6
Malta Required Flowrate
0
20
40
60
80
100
120
140
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
10
3 x
SC
M/h
Hour
Mid-season week day Mid-season Weekend day Summer Week day
Summer Weekend day Winter Week day Winter Weekend day
Peak day
7
Pipeline Data
Pipeline characteristics
Pipe Material Steel Grade API 5L-X65
SMYS 450 MPa
SMTS 535 MPa
Steel Density 7850 kg/m3
Young Modulus 207000 MPa
Poisson Ratio 0.3
Coefficient Of thermal Expansion 1.16 x 10-5 °C-1
Sea Water Density 1026 kg/m3
Concrete Density 3040 kg/m3
Corrosion Coating Density 1300 kg/m3
Corrosion Coating Thickness 2.5 mm
Corrosion Allowance 0 mm
Out of roundness 1.5% OD
but maximum 15 mm
Thickness tolerance ±0.75 mm for t ≤ 15 mm
±1.00 mm for t > 15 mm
8
Soil Data
KP KP SOIL GELA-MALTA
Dr Su D50
From To kN/m3 Deg. % kN/m
2 mm
0 4.4 Fine SAND with occasion Shell becoming medium toward coast
9 44 85-100 -- 0.09-0.16 0.7
(max.)
4.4 7.9 Silty Fine SAND with Occasional Shell. Possible Presence of clayey SAND.
9 32 35-65 -- 0.07-0.1
7.9 10.2 Very Soft Silty CLAY with Occasional Shell 7.5 -- -- 2 0.009-0.013
10.2 21.2 Very Soft Silty CLAY 4.5-5.5 -- -- 2-4 <0.002
21.2 36 Very Soft Silty/Sandy CLAY. Occasional presence of Shell Fragments.
7 -- -- 8-10 0.01-0.03
36 51 Very Soft Silty CLAY. Occasionally some intrusions of sandy CLAY,
5.5* -- -- 6* 0.003
51 95 Very Soft Sandy CLAY, containing some shell fragments
8.0* -- -- 8-15* 0.01-0.04
95 115 Very Soft Silty/Sandy CLAY at top, changing in fine SAND in depth.
4.0*
1-2*
<0.002
8.5* 40* 50-65* <0.074
115 136 Fine to Medium SAND with Occasional Shells. Possible intercalation of Clay and Silt.
8.5* 36-44*
60-100*
-- 0.06-0.2*
136 145 Fine SAND with high content of Shells, concretions and corals.
9.0* 40-44*
80-100*
-- 0.09-0.16 0.7
(max.)*
145 148 Fine to Medium SAND with high content of shells/corals fragment.
8.5* 36-44*
60-100*
-- 0.06-0.2*
148 LTE Gravely SAND. High Probability of Rock Outcrops. 7.0-8.5* 30-36*
35-65* -- 0.1-0.9*
9
Hydraulic Analysis - Inlet and Delivery Gas Conditions
Gas Condition Value
Inlet Gas Pressure (barg) 54
Inlet Gas Temperature (°C) 18
Delivery Gas Pressure (barg) ≥39
Delivery Gas Temperature (°C) As per result of the hydraulic simulations,
in peak day conditions
10
Hydraulic Analysis – Data Input
Pipe and Soil data:
Steel grade: X65 Pipe internal roughness: 25 microns Corrosion Coating Thickness: 2.5 mm.
Pipeline Material Thermal Conductivity
W/m K
Steel 50
Corrosion Coating (PE) 0.3
Overweight Concrete 2.33
Soil Thermal Conductivity
W/m K
Wet Sand 2
Dry Sand at Gela 1
Dry Sand at Malta 1.5
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Hydraulic Analysis – Data Input
Pipeline Burial Configuration:
The pipeline is assumed buried in the onshore sections and in the coastal areas (i.e. for WD<30m at Gela side and for WD<35-40m at Malta side). The pipeline is considered unburied in the deep water.
Pipeline Burial Depth (from the pipeline top)
m
Onshore Sections 1.5
Offshore Sections 1
12
Results
13
Scenario 16” OD Pipeline Gela – Malta (Delimara): Process Analyses Results
Scenario A - 16" ND Pipeline
- Pressure Trends-
30
32
34
36
38
40
42
44
46
48
50
52
54
56
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Time [h]
Pre
ssu
re [
barg
]
Pressure Supply at Gela Terminal (P/L Inlet)
Pressure Delivery at Delimara Terminal (P/L Outlet)
Minimum Delivery
Scenario A - 16" ND Pipeline
- Flow Rates Trends-
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
110,000
120,000
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Time [h]
Flo
w R
ate
[S
cm
/h]
Gas Supply at Gela Terminal (P/L Inlet)
Gas Delivery at Delimara Terminal (P/L Outlet)
14
Scenario 18” OD Pipeline Gela – Malta (Delimara): Process Analyses Results
Scenario A - 18" ND Pipeline
- Flow Rates Trends-
0
20,000
40,000
60,000
80,000
100,000
120,000
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Time [h]
Flo
w R
ate
[S
cm
/h]
Gas Supply at Gela Terminal (P/L Inlet)
Gas Delivery at Delimara Terminal (P/L Outlet)
Scenario A - 18" ND Pipeline
- Pressure Trends-
30
32
34
36
38
40
42
44
46
48
50
52
54
56
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Time [h]
Pre
ssu
re [
barg
]
Pressure Supply at Gela Terminal (P/L Inlet)
Pressure Delivery at Delimara Terminal (P/L Outlet)
Minimum Delivery
15
Scenario 18” OD Pipeline Gela – Malta (Delimara): Wall Thickness Analyses Results
Gela - Malta (Delimara) - OD=18" - Pd=75 bar
WT=10.3
WT=15.9
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
0 20000 40000 60000 80000 100000 120000 140000
KP (m)
Wa
ter
De
pth
(m
)
0
2
4
6
8
10
12
14
16
18
20
Wa
ll T
hic
kn
es
s (
mm
)
WD (m) Min WT (mm) Selected WT (mm)
Min Buckle Arrestors Thickness (mm) Selected Buckle Arrestors Thickness (mm) Min Prop Buckl
16
Scenario 18” OD Pipeline Gela – Malta (Delimara): On Bottom Stability and Layability Analyses Results
Gela - Malta (Delimara) - OD = 18" - Pd=75 bar
CCT= 90.0
CCT= 60.0
CCT= 40.0
CCT= 60.0
CCT= 90.0
-200
-150
-100
-50
0
50
0 20000 40000 60000 80000 100000 120000 140000
KP (m)
Wa
ter
De
pth
(m
)
0
10
20
30
40
50
60
70
80
90
100
Co
nc
rete
Co
ati
ng
Th
ick
ne
ss
(m
m)
WD (m) Selected CCT (mm)
17
Budgetary
Estimates
18
Budgetary Estimates - CAPEX
CAPITAL COSTS Scenario
OD = 18"
Lenght (km) 154.0
Steel Weight (Kton) 17.763
Inch 18
Management and Design Meuro 15
Materials Meuro 53
Construction Meuro 138
TOTAL Meuro 206
19
Budgetary Estimates - OPEX
OPERATING COST
Scenario
OD = 18"
Periodical cost for Pipelines and Shore approaches Surveys (Every two year operations)
Meuro 2.2
Periodical cost for Internal Line Inspection (Every seven years operations)
Meuro 1.4
TOTAL per year Meuro/year 1.3
20
The budgetary cost estimate has been evaluated in Euro on the basis of in house data
bank. Particularly, the following cost for procurement of steel pipeline have been considered:
Budgetary Estimates Notes
2,000 Euro/ton
21
Main exclusions from the budgetary estimate:
• Capital taxes, import duties and levies
• Owner costs, taxes, etc.
• Paid interests and/or financial charges
• Financial arrangements, bonds, guarantees, cash flow burning and similar
• Taxes, duties, fees, VAT, etc. of any nature
• Costs associated with the Builder All Risk (BAR), Third Party Liability (TPL) or other
related Project Insurances including Insurances during the operation period
• Land acquisition and Right of Way
• All permits and licences including special Project environmental protection
arrangements
• Certification
• Any extraordinary intervention on pipelines and plants.
• Weather Down-Time or Weather Stand-By
Budgetary Estimates Exclusions