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Docks Piers & Jetties
 
Nowadays the majority of marine infrastructure design (jetties, port, docks, etc.) involves the use of steel sheets or pipe piles. It is the priority of the owners and operators of such infrastructure to protect these steel structures against corrosion. Cathodic protection is the proffered method of application, due to its ability to extend the operational life of marine infrastructure, reduce its associated maintenance costs, and ensure the uninterrupted operation of docks and jetties.
Typically, coating materials are applied during construction to protect steel surfaces against corrosion. However, approximately 50% of the coating material on the mud part areas of the structure is destroyed during installation, and 1-2% of the coating material on the splash zone, as well as the submerged zone, is destroyed annually. The corrosion rate of bare steel surfaces can vary from 50μm/year – 300μm/year, depending on the areas of the piles. The loss of steel thickness due to corrosion can also vary with water composition, oxygen concentration, marine growth, and/or water velocity.
Average values of corrosion penetration on steel piles and steel sheet piles.
 
Conditions
Corrosion Rate in
Salt water
Corrosion Rate in
Fresh water
Water at surface
100 μm/year
50 μm/year
Salt water in splash zone
300 μm/year
200 μm/year
Below water level
100 μm/year
100 μm/year
Bottom sediment
50 μm/year
20 μm/year
The use of cathodic protection can reduce corrosion rates up to 95% in the submerged and mud part zones, although special precautions must be taken for the splash and atmospheric zones. For the complete protection of the piles, it is suggested to use cathodic protection systems, in combination with coating systems and polyethylene (PE) jackets.
SYNCOR provides solutions for the cathodic protection of new or existing marine infrastructure, such as jetties, piers and marine harbors, by applying a variety of designs based on sacrificial anodes, Impressed Current Cathodic Protection (ICCP) systems, or a combination of these. Each system meets the unique environmental requirements of the intended application, and covers at least the minimum design standards.  
Design Parameters
Detailed engineering calculations, based on national and/or international standards, are used in the design of efficient cathodic protection systems with the intent to eliminate corrosion on the embedded and submerged areas of each protected structure. In order to proceed with our design, we typically ask for the following parameters:
·         Type of piling
·         Number/length of piling
·         Design life of the system
·         Depth of piling above and below seabed
·         Specification for pile coating
·         Method of continuity bonding
·         Layout drawings
·         Classified hazardous areas
·         Facilities for isolation from other structures
·         Power supply type and availability
·         Existing Cathodic Protection (CP) Systems
Based on these design parameters, and our extended professional experience, we can provide the following:
·         Detailed calculations in accordance to any recognized code of practice;
·         Justification of selected parameters;
·         Design optimization in order to minimize the required quantity;
·         Detailed design and installation drawings (AutoCAD).
 

Aluminum and Zinc Sacrificial Anodes

 

Zinc Embedded Anodes

 

Sacrificial Anodes Specifications

 

ICCP

 

Monitoring System

 
Anodes are typically fitted on jetty piles with mechanical clamps shortly after piling to avoid coating damage. Electrical contact can be made by heavy-duty contact bolts or by welding contact strips to an above-water location. The system can be designed for any desired operational life duration.
Aluminium anode
 
 
 
 

 
Type
L (mm)
W (mm)
H (mm)
NW (kg)
ASOF350
1300
101
101
35
ASOF800
2360
114
114
80
ASOF500
1300
120
120
50
ASOF680
1520
133
127
68
ASOF1190
1525
184
159
119
ASOF1240
1800
160
162
124
ASOF1640
2450
160
162
164
Zinc anode
 
 
 
 
 
Type
L (mm)
W (mm)
H (mm)
NW (kg)
ZSOF380
500
101
101
38
ZSOF550
500
115
135
55
ZSOF830
750
115
135
83
ZSOF1120
1000
115
135
112
ZSOF1410
1250
115
135
141
ZSOF1690
1500
115
135
169
L=Length , W=width, H=Height, NW=Net weight 
The above presented anodes can be provided with the following types of inserts based on the desired method of installation.
Alternative anode type
Flat Bar
T bar
 
 
U Channel
Angle bar
 
 
 
 
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