Cathodic Protection For Jetties And Docks
Cathodic protection is a method used to shield steel jetty piles from corrosion. There are two primary ways to achieve this: sacrificial anode and impressed current.
The sacrificial anode method involves attaching an anode, usually made of aluminum or zinc, to each pile. These anodes work independently on each pile and do not affect neighboring ones. Over time, the anode material wears away due to its reaction with the steel, requiring eventual replacement.
However, for larger structures like jetties, sacrificial anodes may not be cost-effective or provide sufficient coverage. In such cases, impressed current cathodic protection (ICCP) is preferred. This method involves installing a rectifier unit that’s connected by cables to all the piles and an external anode. Essentially, all the jetty piles become one electrically connected unit.
ICCP systems typically have a long lifespan and require only basic maintenance. Owners can easily monitor the system’s performance daily without intensive checks.
In summary, cathodic protection is crucial for extending the lifespan of jetty steel piles by preventing corrosion. Sacrificial anodes are practical for smaller projects but fall short for larger structures like jetties. Impressed current systems, on the other hand, provide comprehensive protection for the entire jetty, ensuring longevity with minimal upkeep.
This straightforward protection method ensures that vital marine structures remain durable and safe for use over extended periods, ultimately reducing maintenance costs and ensuring operational reliability.
