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Marine
 
Seawater is one of the most corrosive naturally occurring environments. For vessels trading worldwide, it is essential to provide protection against corrosion of their hull and ballast tank; thus, ensuring lower maintenance costs and longer operational life expectancy.
A detailed design based on the intended operation of a vessel is required for the successful application of a cathodic protection system.
The unique Zinc & Aluminum alloys that are used for the production of our anodes have been developed in our laboratories and perform reliably under a wide range of environmental conditions.
Design
The external application of cathodic protection on a ship’s hull and ballast tank depends greatly on the ship’s trade type, its trade routes, and its design. Generally, cathodic protection requirements vary based on a combination of parameters, such as water salinity, water temperature, and sailing speed range. The condition of the vessel’s external paint coating also affects the demand for cathodic protection.
For new applications, a detailed study for the protection of the ballast tank and hull area of the vessel is necessary in order to provide the maximum protection against corrosion at any stage of the vessel’s service life. For retrofit applications, an extensive evaluation of the condition of the existing anodes should be performed in order to define the quantity and quality of the new anodes required. This evaluation should include the initial and final conditions of the vessel’s coating and steel components.
Our cathodic protection design involves the use of sacrificial anodes and follows standard design rules for all applications. It is suggested that in order to make a proper assessment of the extent of paint damage, the design period should be considered to be well beyond the duration of the average expected dry-docking period.
Our professional engineering department conducts detailed studies for hull and/or ballast tanks in accordance with recognized codes of practice such as DNV, Lloyds, ABS, GL, GB etc.
In order to proceed with each study, the following design parameters should be provided by the client:
·         Required design life of the system;
·         Breakdown/failure of coating (or coating details);
·         Ballast factors;
·         Required electrochemical capacity (or desired alloy);
·         Construction drawings, general arrangement plan, capacity plan, mid-ship section plan, shell expansion or construction plan;
·         Vessel sailing areas (Brackish or salt water).
At SYNCOR we apply the above listed design parameters and use our professional experience to provide the following:
·         Detailed calculations in accordance with all recognized codes of practice;
·         Justification of selected parameters;
·         Optimization of the required quantity;
·         Detailed design drawings (AutoCAD) and installation plan.
 

Hull Anodes

 

Ballast Tank Anodes

 

Antifouling anodes

 

Sacrificial anodes Specifications

 
The external protection of hulls is usually provided by means of organic coatings. The protective paint coating, however, is easily damaged in localized areas by mechanical action such as anchors, and by erosion at parts of the stern frame and the leading edge of the rudder. Preferential corrosion also occurs at rivet heads and welds. Cathodic protection can be of value in preventing, or greatly reducing, corrosion of these areas. The cathodic protection of hulls can be achieved with the use of sacrificial anodes.
Hull sacrificial anodes are typically provided in Hydrodynamic shapes in order to reduce water resistance and efficiently protect vessels such as Tankers, Bulk Containers, tugs, etc., that sail on worldwide routes. Anodes are available in a series of welded types with two or four metallic straps protruded from the end of each side, or as bolted types that need to be fixed on permanent studs on doubler plates and under absorption rubber pads. Standard types of SYNCOR anodes are kept in stock for immediate delivery.
Aluminium
Weld On Type
 
Type
LXWXH (mm)
NW (kg)
GW (kg)
A15
230X78X37
1.1
1.5
A28
290X100X50
2.3
2.8
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Type
LXWXH (mm)
NW (kg)
GW (kg)
A30
275X128X32
2.7
3.5
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Type
LXWXH (mm)
NW (kg)
GW (kg)
A60
450X100X62
5.0
6.2
A100
550X128X50
8.5
9.9
A120
555X132X68
10.3
11.8
A140
660X132X68
12.3
14.1
A150
920X128X48
13.0
15.0
A175
920X128X52
14.8
17.5
A230
920X128X71
20.3
23.0
 


Type
LXWXH (mm)
NW (kg)
GW (kg)
W2A
150X70X20
0.5
0.6
W3A
200X100X20
1.1
1.2
W4A
200X100X30
1.4
1.5
W5A
200100X40
1.8
1.9
W8A
300X150X25
2.7
3.0
W9A
300X150X30
3.0
3.3
W10A
300X150X40
4.2
4.5
W11A
300X150X50
5.1
5.4
W12A
300X150X60
6.3
6.6
W13A
300X150X70
7.4
7.7 
W14A
300X150X75
8.1
8.5
W15A
300X200X40
5.3
5.6
W16A
300X200X45
6.3
6.6
W17A
300X200X50
7.3
7.6
W18A
300X200X55
8.3
8.6
W19A
300X200X60
9.3
9.6
Bolt on type
 
 
 
 
 
Type
LXWXH (mm)
P (mm)
NW (kg)
GW (kg)
B2A
150X70X20
80
0.5
0.6
B3A
200X100X20
110
1.1
1.2
B4A
200X100X30
110
1.4
1.5
B5A
200100X40
110
1.8
1.9
B8A
300X150X25
160
2.7
3.0
B9A
300X150X30
160
3.0
3.3
B10A
300X150X40
160
4.2
4.5
B11A
300X150X50
160
5.1
5.4
B12A
300X150X60
160
6.3
6.6
B13A
300X150X70
160
7.4
7.7 
B14A
300X150X75
160
8.1
8.5
B15A
300X200X40
160
5.3
5.6
B16A
300X200X45
160
6.3
6.6
B17A
300X200X50
160
7.3
7.6
B18A
300X200X55
160
8.3
8.6
B19A
300X200X60
160
9.3
9.6
B20A
300X200X65
160
10.3
10.6
 
Type
LXWXH (mm)
P (mm)
NW (kg)
GW (kg)
RF58
360X180X45
180
5.5
5.8
RF80
540X130X55
340
7.6
8.0
RF96
540X140X65
340
9.2
9.6
RF118
460X200X65
260
11.4
11.8
RF155
540X200X65
340
15.0
15.4
RF165
930X170X40
600
15.5
16.5
RF185
1100X160X40
800
17.5
18.5
RF242
1000X180X55
600
23.2
24.2
L=Length , W=width, H=Height, P=Pitch NW=Net weight, GW=Gross weight
Zinc
Flush Mounted
Weld-on Type
 
 
 
 
 
Type
LXWXH (mm)
NW (kg)
GW (kg)
110Z
285X145X71
10.1
10.6
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Type
LXWXH (mm)
NW (kg)
GW (kg)
10Z
180X60X30
1.0
1.1
30Z
230X78X37
2.2
2.6
50Z
290X100X50
4.8
5.3
 
 
 
 
 
 
 
 
 
 
 
 
 
Type
LXWXH (mm)
NW (kg)
GW (kg)
80Z
275X148X32
7.2
8.0
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Type
LXWXH (mm)
NW (kg)
GW (kg)
70Z
255X92X45
6.0
6.5
80Z
275X148X32
7.3
8.0
130Z
450X100X62
11.8
13.0
160Z
590X105X48
14.3
16.0
220Z
550X128X50
20.5
22.0
300Z
630X130X55
24.3
26.0
 
Type
LXWXH (mm)
NW (kg)
GW (kg)
W2Z
150X70X20
1.4
1.6
W3Z
200X100X20
2.6
2.9
W4Z
200X100X30
3.9
4.2
W5Z
200X100X40
5.2
5.5
W6Z
300X150X20
5.8
6.4
W8Z
300X150X25
7.3
7.9
W9Z
300X150X30
8.8
9.4
W10Z
300X150X40
11.4
12.0
W11Z
300X150X50
14.6
15.2
W12Z
300X150X60
17.5
18.1
W13Z
300X150X70
20.5
21.1
W14Z
300X150X75
21.9
22.5
W15Z
300X200X40
15.6
16.2
W16Z
300X200X45
17.5
18.1
W17Z
300X200X50
19.5
20.1
W18Z
300X200X55
21.4
22.0
W19Z
300X200X60
23.4
24.0
W20Z
300X200X65
25.3
25.9
Bolt on type
 
 
 
 
 
Type
LXWXH (mm)
P (mm)
NW (kg)
GW (kg)
B2Z
150X70X20
80
1.4
1.5
B3Z
200X100X20
110
2.4
2.5
B4Z
200X100X30
110
3.4
3.5
B5Z
200X100X40
110
4.1
4.2
B6Z
300X150X20
160
5.5
5.9
B8Z
300X150X25
160
7.1
7.5
B9Z
300X150X30
160
8.8
9.0
B10Z
300X150X40
160
11.1
11.4
B11Z
300X150X50
160
13.5
13.8
B12Z
300X150X60
160
15.9
16.2
B13Z
300X150X70
160
18.3
18.6
B14Z
300X150X75
160
20.0
20.3
B15Z
300X200X40
160
14.8
15,1
B16Z
300X200X45
160
18.3
18.6
B17Z
300X200X50
160
20.3
20.6
B18Z
300X200X55
160
22.1
22.4
B19Z
300X200X60
160
24.3
24.6
B20Z
300X200X65
160
26.4
26.7
 
Type
LXWXH (mm)
P (mm)
NW (kg)
GW (kg)
RB14
360X180X45
180
14.4
14.7
RB20
540X130X55
340
19.7
20.1
RB25
540X140X65
340
24.0
24.4
RB30
460X200X65
260
30.4
30.8
RB40
540X200X65
340
39.6
40.0
RB41
930X170X40
600
40.6
41.6
RB47
1100X160X40
800
45.5
46.5
RB60
1000X180X55
600
60.4
61.4
L=Length , W=width, H=Height, P=Pitch NW=Net weight, GW=Gross weight

 
 
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