Cathodic
Protection (CP) is the application of direct current
to reverse the natural tendency for metals to return
to their natural condition as metal oxides (rust). CP
prevents the corrosion process from occurring.
Corrosion
occurs in the presence of moisture. In Above Ground
Storage Tanks, it is important, both economically and
environmentally, to protect tank bottoms from corrosion.
The area under the tank bottom can become moist and
can remain moist from ground moisture, under-tank condensation
or seam leakage.
Present regulations make protection of the tank bottom
desirable. Whether the tank bottom is the initial bottom
of a new tank, a replacement bottom, or a double bottom,
proper corrosion protection is important.
In the past, replacement bottoms were installed over
the old bottom and welded to the old bottom at the tank
wall. This procedure closes the corrosion circuit, making
the new steel anodic to the old tank bottom, and in
the process accelerating the corrosion process of the
new metal.
Experience has shown that a properly designed and installed
zinc ribbon anode system in the interstitial space between
new and old tank bottoms is very effective at providing
cathodic protection. This system has been recognized
throughout the industry as the most cost effective and
efficient method of corrosion control today.
Plattline™ Zinc Ribbon Anodes provide a simple
and cost effective method of corrosion control for Above
Ground Storage Tank bottoms. The zinc ribbon is self
regulating, which means that it will protect the steel
tank bottom when the electrolyte (the sand) is conductive
(moist) only on demand. When the demand decreases, the
zinc ribbon output will decrease as well. No external
power source is required.
Plattline™ is a continuous zinc ribbon and simple
to install. No special tools are required and there
is no need for constant monitoring or maintenance once
the system is installed.
