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14)Impressed Current And Anti-Fouling Systems
陰極防蝕系統 Impressed Current Cathodic Protection System (ICCP)

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Impressed Current Cathodic Protection System (ICCP)
The Wilson Taylor 'Hullmatic' ICCP system is designed to prevent the external corrosion on underwater steel. Applications are suited for ships, offshore rigs, semi submersible and other marine structures.
ICCP systems were developed originally to protect the underwater external hulls of large tankers and bulk carriers, which could not be adequately protected by sacrificial anode systems. ICCP systems are so successful that they are in common use on all ranges of ships.
Each 'Hullmatic' ICCP system fundamentally comprises of four main parts:-
1. Titanium anodes designed to last at least 20 years - either linear surface mounted or recessed.
2. Zinc or sliver/silver chloride reference electrodes - either surface or recessed.
3. Propeller shaft bonding slip ring and rudder stock cable
4. Automated control panel - rated from 100 amps to 800 amps
All 'Hullmatic' anodes conduct D.C. protective current into the seawater to maintain the hull potential at the correct level to prevent corrosion occurring at areas when the paint has become damaged. The anodes are constructed from titanium elements coated with either platinum or mixed metal oxide. The elements are encapsulated in a tough chlorine resistant resin carrier. Anodes are available with capacity from 50 amps to 200 amps.
The reference electrodes are designed to give a stable reference against which the hull to sea potential can be measured.
To allow the protection for the propeller a high content silver alloy band is attached around the shaft. Contact between the shaft and hull is by way of silver graphite brushes.
Similarly, the rudder protection is ensured by the fitting of a bonding cable, which is attached to the rudderstock and hull.
The 'Hullmatic' control unit is a thyristor-based unit with a computer controller available with either analogue or digital displays. The unit is in wide use today and recognised for its reliability and robust quality in often harsh environments.

海生物防蝕系統 MGPS

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'Intakematic' Marine Growth Anti-fouling Protection System
The Wilson Taylor Marine Growth Protection System (MGPS) is designed to prevent marine growth from accumulating and reducing corrosion within sea water pipes associated with seawater cooling systems.
Marine growth is the result of settlement of the larvae and subsequent growth of the shell type life such as Acorn Barnacle, Gooseneck Barnacle etc. In extreme cases fouling can become so serious as to completely obstruct pipes preventing the flow of seawater through them. This can lead to complications with cooling water flow and reduction of machinery efficiency, corrosion and loss of speed - a serious situation especially when charters demand a minimum speed.
The Wilson Taylor 'Intakematic' system is electrolytic in action using copper and aluminium or iron anodes installed usually in the sea chests which are fed by a low dc current from a constant current control panel. The subsequent release of copper ions is sufficient to deter settlement of larvae. The required level of copper to prevent fouling is extremely small and measured in micro grams per litre of seawater.
The 'Intakematic' system for the prevention of fouling has the following advantages:-
• Simple Installation
• Operates automatically
• Minimum supervision required
• Complete protection against fouling
• Reduction in corrosion
• Minimal power requirement
Each Wilson Taylor System is designed to suit each vessel and takes into account the following factors:-
1. Quantity of seawater to be treated (flow rate) in cubic meters per hour.
2. Required life of anodes (usually dry docking interval for sea chest mounted anodes).
3. Material of pipe works in the sea water system.