|
|
AnodeFlex
1500
Linear Anode System
By Covalence
Long-line flexible anode for
impressed-current cathodic
protection in directional drill applications
Description
AnodeFlex 1500 is a
long-line, flexible, cable-like anode, which is placed in
continuous close proximity to the target structure. Uniform
distribution of cathodic protection current is therefore
achieved on applications where many conventional anode ground
beds do not work.
Key to the product’s performance
is the central, conductive-polymer coated copper conductor. This
unique construction allows current to flow long distances down
the center conductor, while allowing sufficient cathodic
protection current to continuously pass through the conductive
polymer all along the length of the anode.
 In contrast to conventional CP
systems, AnodeFlex is placed in the ground in close proximity to
the steel surface to be protected and provides uniform
distribution of protective current to the entire steel surface,
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 anode cable is
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 helps prevent over-voltage
problems such as hydrogen generation and associated rapid
coating disbondment. In addition, interference from other
structures and stray currents are virtually eliminated.
On poorly coated pipelines where
optimal polarization can no longer be achieved, AnodeFlex 1500
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. Above ground storage tank bottoms and
buried tanks can be more effectively protected from corrosion
using this continuous, close proximity anode system.
|
| AnodeFlex 1500
Construction
Five basic elements:
- Central Copper Conductor:
#6 AWG, serving as a low resistance busbar to deliver the
required current over considerable distance without
incurring substantial longitudinal voltage drop.
- Conductive polymer:
0.5" (13 mm) in diameter special extrusion, sealing the
copper conductor from chemical attack, yet allowing current
to flow through it, from the conductor to the environment
all along its length.
- Coke breeze:
Pre-packaged, high performance calcined petroleum coke
breeze, serving as the active matrix in which the
electrochemical reactions take place. Designed for minimum
of 20 years service life at maximum current output of 16
mA/ft (52 mA/m).
- Fabric jacket:
Integrated woven, acid resistant and porous jacket holding
the coke breeze in place around the anode.
- Protective braid:
Tough, porous, non-conductive protective braid enhancing the
abrasion and damage resistance of the fabric jacket.
Maximum Temperature: 50ºC
- 122ºF
|
Product Features /
Benefits
- Anode is always in close
proximity to pipeline
Distributes current
uniformly over total length of pipeline.
No over- or under-protected
areas.
Prevents accelerated coating disbondment.
More effective & economical
than a series of discrete anodes. Independent of variations in
soil resistivity.
- Pipeline rehabilitation
without excavation
A fraction of the cost of recoating.
Environmentally friendly.
No loss of revenue or supply interruptions.
No safety concerns as needed for working on live lines.
Far
quicker, up to 1.25 miles (2 km) laying speed per day.
- Long continuous circuit
lengths
90% fewer joints than conventional anode systems.
Lower maintenance costs.
- Avoids interference and
stray current problems
Enhances long-term
performance. Focuses current on target
structure. Improves protection and cost
efficiency.
- Pre-packaging coke breeze
(AnodeFlex 1500-01)
Ensures low resistance ground bed all the time. Ensure the
polymer coated cable is centered. Simplifies field
installation.
- Installation with
standard cable laying equipment
Fast, easy, cost effective.
|
AnodeFlex 1500
Typical Properties
|
|
Recommended
max design |
Current output in
soil
Min installation & storage temp.
Min bend radius |
52 mA/m (16 mA/ft)
-18ºC (0ºF)
500 mm (20") |
|
Product weight & dimensions |
Nominal diameter
Weight
Length
Coke breeze requirements |
1.5" (38 mm)
1.0 lbs/ft (.49 kg/m)
1550 ± 100 ft (472 ± 30 m)
0.072 lb/ft (1.15 kg/m) |
|
Coke breeze requirements
|
Material
Bulk Density
Content
Resistivity at 10 Bar
Particle size |
Calcined petroleum coke
(fluid or delayed),
predominately spherical or round
> 65 lb/ft3 (961 kg/m3)
Fixed carbon > 99%
Ash <= 0.5 %
No volatiles at 950°C
<= 0.1 Ohm-cm
Size as small as possible, but must meet 1%
between 1.2 mm (Mesh 16) & 12.7 mm (1/2"),
99% < 1.2 mm |
|
Copper Conductor |
Dimensions
Resistance |
6 AWG per ASTM B-263
0.0015 Ohm/m per ASTM B-193 |
|
Conductive Polymer |
Dimensions
Volume resistivity |
Pass per ASTM B-263
1.5 Ohm-cm per ASTM B-193 |
|
Coke
Breeze |
Fixed carbon
Resistivity |
99.7% per ASTM D-172
0.4 Ohm-cm per G.L.C.-C-12A at 23ºC, 10 bar |
|
Fabric
Jacket |
Weight
Bursting strength
Abrasion resistance
Fluid resistance
Chlorine resistance
UV resistance |
229 g/m2
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)
|
AnodeFlex 1500
Ordering Information
|
| Part
Number |
Description |
AFLX 1500-01
AFLX-1500-01-CAP
AFLX-1500-01-TEE
AFLX-1500-1-SPLICE
Design software |
AnodeFlex
1500-01, standard length 1550 ± 100 ft.
End seal kit
Tee splice kit
In-line splice kit
Special computer program to calculate cathodic protection circuit
lengths, anode to pipe distances, power supply voltages, and current
demands for each individual AnodeFlex section on pipeline and tank
applications. |
Go to
AnodeFlex Linear Anode System Overview &
AnodeFlex Products.
|
