Linear anode is a long-life, flexible, wire anode, which can be placed remote to the target structure. Greater current output can be achieved on applications where close proximity anode groundbeds do not work.
Key to the product's performance is the central, copper-core mixed metal oxide anode. The anode is powered by a # 8 AWG copper cable insulated with an inner layer of halar and outer layer of high molecular weight polyethylene. The unique construction of the anode and copper cable allows high current output with protection against low pH and chlorine attack.
Our linear anode can be placed remote to the steel surface to be protected, thereby maintaining the steel-to-soil "instant-off" potential in the required window of -850 mV (-950 mV if SRB's present) and -1200 mV.
The central MMO wire and cable are surrounded by factory prepackaged, high-conductivity coke breeze, held in place by a porous, woven acid-resistant jacket. This arrangement avoids handling loose coke breeze and simplifies field installation. The improved current distribution increases anode efficiency and maintains a low resistance groundbed. On poorly coated pipelines where optimal polarization can no longer be achieved, linear anode can often be installed as an alternative to expensive recoating. Both on single and multi-parallel pipelines, safe levels of polarization will be restored at every point. The system avoids difficult and costly field recoating and greatly reduces environmental disturbance.
Linear anode is delivered on long length spools. Because no additional coke breeze is required, the installation is as simple as laying a low -voltage power cable. Proven heat-shrinkable splice kits, with tee splices and end sealing caps, are available to complete any installation design.
Construction
Five basic elements:
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Central Copper Bus Cable:
#8 AWG Halar Insulated, serving as a low resistance busbar to deliver the required current over considerable distance without incurring substantial longitudinal voltage drop. Halar insulation seals the conductor from chemical attack.
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Copper-Cored, Mixed Metal Oxide Anode (MMO):
Provides low attenuation for reduced splicing, in combination with prepackaged coke breeze, offers a low resistance groundbed designed for a minimum life of 40 years.
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Coke Breeze:
Pre-packaged, high performance calcined petroleum coke breeze, serving as the active matrix in which the electrochemical reactions take place. Designed for min. 20 years service life at max. Current output of 656 mA/m (200 mA/ft).
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Fabric Jacket:
Integrated woven, acid resistant and porous jacket holding the coke breeze in place around the anode.
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Protective Braid:
Tough, porous, non-conductive protective braid enhancing the abrasion and damage resistance of the jacket.
Maximum Temperature:
50ºC - 122ºF
Features and Benefits
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Anode can be remote to the pipeline
Distributes current uniformly over total length.
No over- or under-protected areas.
Prevents accelerated coating disbondment.
More effective and economical than a series of discrete anodes.
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Pipeline Rehabilitation without Excavation
A fraction of the cost of recoating.
Environmentally friendly.
No loss of revenue or supply interruptions.
No safety problems associated with working on live lines.
Far quicker, up to 1.25 miles (2 km) laying speed per day.
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Long continuous circuit lengths
67% fewer joints compared to conventional anode systems.
Lower maintenance cost.
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Flexible under tank bottom design
Directional drill with no PVC, no backfill.
Tight bend radius.
Driving voltage is lower than conventional MMO.
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Pre-packaged coke breeze
Simplifies field installation.
Installation with standard cable laying equipment.
Fast, easy & cost effective.
Properties
Copper Conductor
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Dimensions
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8 AWG per ASTM B-263
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Coke Breeze
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Fixed carbon
Resistivity
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99.7% per ASTM D-172
0.4 ohm-cm per G.L.C.-C-12A at 23ºC, 10 bar
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Fabric Jacket
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Weight
Bursting strength
Abrasion resistance
Fluid resistance
Chlorine resistance
UV resistance
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200 g/m2 min, 229 g/m2 typical
575 N per ISO 3303
219 cycles to failure per ASTM D-4157
Pass, 6-month immersion test
Pass, 6-month immersion test
55% tear strength loss per ASTM G-53,
8 hrs @ 60ºC (140ºF), 4 hrs condensation @ 50ºC (122ºF)
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Part Number
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Description
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CORROCO-02
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Copper-core MMO with copper conductor surrounded by pre-packaged high-conductivity coke breeze.
Standard length 494 m ± 6 m (1620 ft ± 120 ft)
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CORROCO
-CAP
CORROCO
-TEE
CORROCO
-SPLICE
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End seal kit
Tee splice kit
In-line splice kit
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