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ABSTRACT
One of the areas where cathodic protection of marine structures is commonly applied is to protect steel piling systems on jetties and piers Every CP design effort begins with a basic decision of whether to use galvanic anodes that operate on the natural potential difference between the anode and the structure or impressed current anodes with an external power supply. This article discusses the design and implementation of cathodic protection on a new construction jetty in one of the country in Far East. In this paper we will discuss the design, materials, installation and commissioning of ICCP system using MMO SLED anodes for cathodic protection of metallic piles.
Key words: ICCP, MMO Sled Anodes, Piles, Marine
INTRODUCTION
Ever since Sir Humphry Davy first applied cathodic protection (CP) to protect the British Navy's warships from corrosion, the benefits of CP in marine applications have been adopted in a wide range of applications. One of the areas where CP is commonly applied to marine structures for corrosion protection is the steel piling systems on jetties and piers. This article discusses the design and implementation of CP on a newly constructed jetty, and includes a comparison of key factors for commonly used galvanic (aluminum) anodes and impressed current (titanium with mixed metal oxide) anodes.
Every cathodic protection (CP) design effort begins with a basic decision of whether to use galvanic anodes that operate on the natural potential difference between the anode and the structure, or impressed current anodes with an external power supply that can provide a range of driving voltages.
Considerations that influence the selection of the type of CP system are availability of electrical power, and dependability of the overall system. Galvanic anode systems have shown dependability for longterm protection, whereas impressed current systems are capable of providing long-term protection but are less tolerant of design, installation, and maintenance shortcomings than galvanic anode systems. Good service can be expected if proper attention is paid to mechanical strength, connections, cable protection (particularly in the wave or splash zone), choice of anode type, and integrity of power source. Adequate system monitoring should be provided. Built-in redundancy, the use of appropriate design margins, and provisions at the design stage for thorough maintenance can enhance the dependability of...