UFC 3-570-06
JANUARY 31 2003
Figure 2-28. Distributed Impressed Current Cathodic Protection System
Two Stage
Anodes
Auto Rectifier
+
-
Permanent
Reference
Electrodes
Anodes
Thermit Weld
2-7.3.4
Deep Remote Impressed Current CP Systems. These systems are
commonly used to protect large structures in built up areas. This is usually the most
economical choice when the structure is large, in an area with many other utilities, or
the anodes cannot be placed near the surface. This type of anode bed is used to
protect pipeline distribution systems, aboveground tank farms, and pipelines in built-up
areas. The anodes are placed in remote earth by drilling deep below the surface. The
typical deep anode bed is 30.5 meters (100 feet) to the top anode, and from 61 to 183
meters (200 to 600 feet) to the bottom anode. The anodes can be on individual leads,
spaced on a continuous cable, or be a continuous anode wire. This type of anode bed
can have a much higher current capacity than typical surface anode systems. This type
of system minimizes interference to other metallic structures. This system requires
special consideration for backfill, cable insulation, and venting.
Figure 2-29. Deep Remote Impressed Current Cathodic Protection System
Rectifier
Well Cap
Pipeline
(Cathode)
Environmental
Casing
100 Ft
Seal
Pea Gravel
Anodes
100-500 Ft
2-55
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