Civil Engineering Reference
In-Depth Information
TABLE 6.11
Recommended Initial, Mean and Final Design Current Densities (A/m
2
) as a Function of Depth, Climatic Region and
Surface Water Temperature Based on DNV
Tropical (
>
20
°
C)
Sub-Tropical (12
-
20
°
C)
Temperate (7
-
11
°
C)
Arctic (
<
7
°
C)
Depth
(m)
Initial
Mean
Final
Initial
Mean
Final
Initial
Mean
Final
Initial
Mean
Final
0
-
30
0.150
0.070
0.100
0.170
0.080
0.110
0.200
0.100
0.130
0.250
0.120
0.170
30
-
100
0.120
0.060
0.080
0.140
0.070
0.090
0.170
0.080
0.110
0.200
0.100
0.130
100
-
300
0.140
0.070
0.090
0.160
0.080
0.110
0.190
0.090
0.140
0.220
0.110
0.170
>
300
0.180
0.090
0.130
0.200
0.100
0.150
0.220
0.110
0.170
0.220
0.110
0.170
TABLE 6.12
Recommended Constants a and b for Calculation of Paint Coating Breakdown Factors
b
Water Depth 0-30 m Water Depth
Category Description
a
>
30 m
1
One layer of epoxy paint coating thickness
>
20
μ
m of dry film
0.10
0.10
0.05
2
One or more layers of marine paint coating by epoxy, polyurethane
or vinyl base, with total nominal of the dry film thickness
0.05
0.025
0.015
>
250
μ
m
3
Two or more layers of marine paint coating by epoxy, polyurethane
or vinyl base, with total nominal of the dry film thickness
0.02
0.012
0.008
>
350
μ
m
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