Graphite Anodes
Graphite Anodes
Choosing the right impressed current anode for a
particular protection project is highly dependent on the
environment which surrounds a buried or submerged
structure. In relatively dry soils, graphite anodes have
proven to be an ideal choice.
Corrpro manufactures a
complete line of graphite anodes which are produced
according to strict quality control guidelines. The
anodes are composed of high quality petroleum coke
which is mixed with coal tar binders and extruded
into various diameter rods. The rods are heated
repeatedly at temperatures in excess of 2,600°C and
then cooled. The end result of this manufacturing
process is an anode with a high percentage of carbon
which can deliver effective protection at a relatively low
consumption rate. In buried soil electrolytes, with coke
backfill, this consumption rate varies between 0.4 and
2.0 lbs/amp-yr.
Due to the fact that graphite anodes
are inherently very porous, Corrpro treats its graphite
anodes with a microcrystalline wax. This wax inhibits
moisture naturally penetrating the anode and extending
the life.
A quality connection is an integral part of any high
performance graphite anode. In addition to offering a
standard end connection, Corrpro also produces a low resistance
center connection. Center wire connections
were developed to compensate for end effect. In
this phenomenon, increased consumption occurs at
the longitudinal ends of an anode. Corrpro’s center
connection compensates for this effect. The lead wire
connections in graphite rod anodes are made with
an alloyed lead ferrule soldered to a tinned stranded
copper conductor. The lead wire ferrule assembly is
inserted into a predrilled hole in the end of the anode
and hydraulically compressed to expand in an outward
direction against the wall of the drilled hole. The
connection made will withstand a minimum pull-out
strength of 300 lbs. with a wire connection resistance
under 0.004 ohm.
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Applications
While graphite anodes will operate in aqueous
environments, they perform best under dry soil
conditions. Use of a backfill effectively increases the
graphite anode’s discharge surface area and lowers
anode-to-earth resistance. The anodes have been
successfully used in both conventional and deep
ground bed applications and demonstrate exceptional
protection in high chloride environments.
Ordering Procedures
Corrpro’s graphite anodes are available bare or prepackaged
in a Spira-Pak® container filled with a coke
breeze backfill. To order the required anode for your
structure, indicate that you need a graphite anode.
Specify the quantity desired, the anode type, the
connection type, the lead wire length, size, insulation and whether it should be packaged or bare.
Call 866.CORRPRO (866.267.7776) for more information or to place an order.