What is Marine Growth?
Ships while sailing use seawater for several purposes. The seawater is used in the ship’s system and discharged after the use. However, seawater contains several marine organisms which enter the ship along with the seawater and deposit and flourish on the parts of the ship’s system. These macro and micro marine organisms such as sea worm, mollusks barnacles, algae, hard shells like acorn barnacles etc. These organisms stick to the surface of the ship and flourish over there, resulting in marine growth. Sourch Link
Effects of Marine Growth
As the marine organisms flourish they block and narrow the passage of cooling water in the ship’s system resulting in the following factors:- Impairing the heat transfer system
- Overheating of several water-cooled machinery.
- Increase in the rate of corrosion and thinning of pipes
- Reduced efficiency which can lead to loss of vessel speed and loss of time.
There are two kinds of protection system normally use on bboard ship.
1. MGPS (Marine Growth Prevention System)
2. ICCP (Impressed Current Cathodic Protection)
MGPS:
The system consists of a control unit which supplies impressed current to anodes. The copper anode produces ions, which are carried away by the sea water into the piping and machinery system. Concentration of copper in the solution is less than 2 parts per billion but enough to prevent marine life from settling.
Basic principle on which MGPS runs is electrolysis. The process involves usage of copper, aluminum and ferrous anodes. The anodes are normally fixed in pairs in the main sea chests.
The anodes can also be fitted in sea strainers. The ions, spread over the system and produce a anti fouling and anti corrosive film over the sea water pipelines, inter-coolers, condensers, heat ex-changers, valves, refrigeration systems, box coolers and ac units internally. Increasing seawater circulation and eliminating corrosion in the
pipelines, increasing its duration and efficiency. That means energy savings.
ICCP: Impressed current cathodic protection (ICCP) is a type of system usually applied where there are elevated current requirements for protection against corrosion. This is used in cases where the driving voltage is higher than the galvanic system or if there is a need for increased system control.
It offers permanent and automatic protection that aids in preventing galvanic corrosion and electrolysis from attacking the undersides of various mobile or fixed offshore structures as well as sea vessels. It is the top protection system of choice of ship owners since it can efficiently reduce maintenance and fuel cost.
Impressed current cathodic protection works by delivering controlled amounts of DC current to the surfaces submerged in water with the aid of ultra-reliable zinc electrodes as well as combined anodes of metal oxide. The electrical current that is continuously regulated and monitored by the ICCP system helps prevent the electro-chemical mechanism of galvanic corrosion prior to its attack.
Since the 1990s, different types of sea vessels like LNG carriers, oil tankers, work boats as well as cruise ships have achieved substantial benefits from ICCP’s 24-hour protection from the damaging and costly effects of electrolysis.
The following are some of the advantages of ICCP:
With the ICCP system, protection against corrosion is provided for a broad range of metallic materials in different settings such as:
1. MGPS (Marine Growth Prevention System)
2. ICCP (Impressed Current Cathodic Protection)
MGPS:
The system consists of a control unit which supplies impressed current to anodes. The copper anode produces ions, which are carried away by the sea water into the piping and machinery system. Concentration of copper in the solution is less than 2 parts per billion but enough to prevent marine life from settling.
Basic principle on which MGPS runs is electrolysis. The process involves usage of copper, aluminum and ferrous anodes. The anodes are normally fixed in pairs in the main sea chests.
The anodes can also be fitted in sea strainers. The ions, spread over the system and produce a anti fouling and anti corrosive film over the sea water pipelines, inter-coolers, condensers, heat ex-changers, valves, refrigeration systems, box coolers and ac units internally. Increasing seawater circulation and eliminating corrosion in the
pipelines, increasing its duration and efficiency. That means energy savings.
ICCP: Impressed current cathodic protection (ICCP) is a type of system usually applied where there are elevated current requirements for protection against corrosion. This is used in cases where the driving voltage is higher than the galvanic system or if there is a need for increased system control.
It offers permanent and automatic protection that aids in preventing galvanic corrosion and electrolysis from attacking the undersides of various mobile or fixed offshore structures as well as sea vessels. It is the top protection system of choice of ship owners since it can efficiently reduce maintenance and fuel cost.
Impressed current cathodic protection works by delivering controlled amounts of DC current to the surfaces submerged in water with the aid of ultra-reliable zinc electrodes as well as combined anodes of metal oxide. The electrical current that is continuously regulated and monitored by the ICCP system helps prevent the electro-chemical mechanism of galvanic corrosion prior to its attack.
Since the 1990s, different types of sea vessels like LNG carriers, oil tankers, work boats as well as cruise ships have achieved substantial benefits from ICCP’s 24-hour protection from the damaging and costly effects of electrolysis.
The following are some of the advantages of ICCP:
- Enhanced lifespan of shafts, propellers and rudders as well as other sea vessel parts involved in electrolysis .
- Anodes are sturdy, light and compressed for convenient storage, shipping and setup.
- Reference cells along with automatic control and anodes help keep proper protection levels for submerged fittings and hulls, which can be more advantageous than zinc anodes that cannot adjust or compensate for extreme loss of paints or salinity changes.
- Guarantees simple and dependable operation
- Maximum corrosion protection documentation at the least overall expense
- Single installation needed for the structure or vessel
- Enhanced dry rock period
- Recognized by all societies of classification for all vessel types
- Designed to deliver more than 20 years of service.
With the ICCP system, protection against corrosion is provided for a broad range of metallic materials in different settings such as:
- Pipelines
- Ship hulls
- Storage tanks
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