Installing C.P. Components
8:19
CP 1 – Cathodic Protection Tester Course Manual
©
NACE International, 2000
07/01/04
Figure 8.17 Aluminum Alloy Anodes for Offshore Structures
Hanging anodes, usually of aluminum alloy, may be used to protect piping on a
wharf or similar structure. When hanging anodes are used, it is necessary to
connect a lead wire between the anode eyebolt core and the structure.
In fresh water, zinc and magnesium anodes are frequently used. These
anodes also find some use in salt water. They are also used on ship hulls
and in ballast tanks and condenser water boxes as described below. The
anodes may be cast on steel mounting strips or provided with a drilled hole
for mounting on a stud bolt.
Impressed Current Groundbeds
General
Impressed current cathodic protection systems provide protection in a
manner similar to galvanic anodes. The difference is that in an impressed
current system, the current is supplied by an external source rather than by
the galvanic action between the anode and the structure.
The groundbed and rectifier must be installed according to construction
specifications. This is very important since premature failure can occur if
proper installation procedures and precautions are not followed.
Impressed current anodes may be installed in either surface groundbed
configurations or a deep anode configuration. Installation techniques are
discussed below.
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