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Anodes for Cathodic Protection - Lesson Summary

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The key points from this module are:

Storage tanks can be classified into two categories.

Aboveground storage tank: This is large containers, usually made of metal and resting on top of the ground. It is given by the NACE Standard RP0193.
Underground tank: This is a tank and any underground piping connected to the tank that has at least 10 percent of its combined volume underground. It is governed by the NACE Standard RP0285.

There are two types of anodes for cathodic protection.

Sacrificial anode: These are highly active metals that are used to prevent a less active material surface from corroding.
Impressed current anodes: It uses an external power source (rectifier) to develop a high potential difference between the surface to be protected and an anode.

Stray current refers to a current that flows somewhere other than the intended current path. When this stray current flows through a pipeline or other metal structure, it can cause corrosion.