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Impressed Current Anodes

The advantages of using Silicon Iron impressed current anodes have been widely known throughout out the Cathodic Protection Industry for many years. Their specific resistance, their suitability for fresh water, sea water and deep ground-bed installation, added to their proven low consumption rate and dependability, have enhanced their position as the number one choice available to Cathodic Protection Engineers.

 
 
AFIC is capable of supplying a full range of silicon iron anodes in tubular or solid form. Standard silicon iron anodes are generally produced with the following chemical composition; although a client’s own specific composition can be supplied upon receipt of details;


Standard Composition

Material
Percentage %
Silicon
14.20 - 14.75%
Chromium
3.25 - 5.00%
Manganese
1.50% max
Carbon
0.70 -1 .10%
Copper
0.50% max
Molybdenum
0.20% max
Iron
Reminder

Standard Dimensions of HSCI Tubular Anodes

Tubular
O.D
I.D.
Length
Wt. Kg
Wt. Lbs

Nominal Discharge

TA-1 (MS-1)
71mm
45.7mm
1067mm
14.1
31.0
1.5 ~ 20.A
TA-2 (MS-2)
58mm
35.6mm
2134mm
20.9
46.0
3.0 ~ 4.0A
TA-3 (MS-3)
71mm
45.7mm
2134mm
28.6
63.0
3.5 ~ 5.0A
TA-4 (MS-4)
96mm
74.4mm
2134mm
39.2
85.0
6.0 ~ 7.0A
E (MS-5)
124mm
99.0mm
2134mm
49.9
110.0
6.0 ~ 8.5A
TA5A (MS-6)
124mm
86.4mm
2134mm
79.4
175.0
9.0 ~ 10.0A
(MS-9)
71mm
38.1mm
1016mm
16.3
36.0
1.5 ~ 2.0A
FW (MS-10)
27.9mm
20.3mm
229mm
0.5
1.0
0.025A
G2 (MS-11)
50.8mm
33.0mm
229mm
2.3
5.0
0.1A

Silicon iron anodes can be supplied with all required extras:

HMWPE cable attachment with specific cable length
Canister with carbonaceous backfill
Heat shrink caps
Ropes or suspension assembly
Centralizers
Client specific requirements

High Silicon Cast Iron Solid Anodes

Standard Composition

Solid anodes are available with or without a chrome additive. This chrome additive enhances the performance of the anode system and is usually accepted as standard.

Element
Normal
Chrome
Silicon
14.5%
14.5%
Chromium
--
4.5%
Manganese
0.75%
0.75%
Carbon
0.85%
0.95%
Iron
Reminder
Remainder

Standard Dimensions of HSCI Solid Anodes

The following sizes are available from AFIC stock;


Diagram of Standard Dimensions of HSCI Solid Anodes

O.D
I.D.
Length
Wt. Kg
Wt. Lbs
2”
2½”
3”
3½”
4”
1”
1½”
2”
2½”
3”
36”
3.2
8.6
14.5
22.3
31.4
7
19
32
49
69
2”
2½”
3”
3½”
4”
--
5.5
10.0
19.1
28.6
40.9
12
22
42
63
90
2”
2½”
3”
†2”
3½”
4”
4½”
1”
1½”
2”
2”
2½”
3”
4½”
60”
6.8
13.2
20
20
35.9
50.0
99.1
15
29
44
44
79
110
218

* Nominal (5%)
† Parallel Anode with no expanded head specifically manufactured for Durichlor 51 Company USA.

Silicon iron rod anodes can be supplied with all required extras;

HMWPE cable attachment with specific cable length
Canister with carbonaceous backfill
Heat shrink caps
Ropes or suspension assembly
Centralizers
Client specific requirements


Platinized Titanium and Niobium Anode

Platinized Titanium Rod Anodes


Platinized Titanium Rod Anodes

The two most common platinized anodes in use in the cathodic protection industry incorporate titanium and niobium substrates. The performance of these anodes in seawater at high current densities is well established.

Applications:

Pt/Ti-Nb-Ta rod anodes are widely used for internal protection of condensers, process equipment etc.
Pt/Ti-Nb-Ta wire anodes are used for internal protection of water tanks and pipelines.
Pt/Ti-Nb-Ta mesh anodes are used for protection of reinforced concrete structures.

To get more information about Platinized Titanium anodes, kindly contact AFIC sales department.

Mixed Metal Oxide Anode


The MMO anodes are composed of a titanium-ribbon substrate coated with a mixed-metal-oxide catalyst. Because the titanium substrate is naturally passivated by an oxidizing film, the ribbon anode remains dimensionally stable over time. Direct current transfer is accomplished through the mixed-metal-oxide catalyst, which is highly conductive, and fully oxidized so that the higher current outputs are possible. This two-part composition allows for a maximum current density of 5.0 mA/sq.ft. to achieve a 50-year design life.

MMO Tubular Anodes

Tubular anodes are manufactured using titanium which meets ASTM B338 Grade 1 or 2 Standards. Mixed Metal Oxide Anodes have an extremely low consumption rate. The titanium substrate remains constant throughout the design life of the anode therefore these anodes are also familiar as Dimensionally Stable Anodes (DSA).

Standard Dimensions of MMO Tubular Anodes

Environment
Anode Size
Current Output
Lifetime
Coke, Soil & Freshwater
3/4” x 48” (19mm x 1220mm)
7 amps
20 years
 
1” x 19.7” (25mm x 500mm)
4 amps
20 years
1” x 39.4” (25mm x 1000mm)
8 amps
20 years
 
1” x 48” (25mm x 1220mm)
3.5 amps*
20 years
 
1” x 60” (25mm x 1500mm)
4.5 amps*
20 years
 
1.25” x 48” (31.75mm x 1220mm)
12 amps
20 years
 
3/4” x 48” (19mm x 1220mm)
45 amps
20 years
 
1” x 19.7” (25mm x 500mm)
25 amps
20 years
 
1” x 39.4” (25mm x 1000mm)
50 amps
20 years
 
1.25” x 48” (31.75mm x 1220mm)
75 amps
20 years

*Current outputs are derated for use in metallurgical coke breeze – 50A/m2

MMO Rod Anodes

Rod Anodes are comprised of a titanium substrate with a mixed metal oxide coating. The mixed metal oxide is a crystalline, electrically conductive coating that activates the titanium and enables it to function as an anode.

MMO Rod anodes are designed for application in:

Process vessels
Water condenser boxes
Heat exchangers
Water intake structures
Groundbed applications

Standard length is 4 ft, but the anodes may be custom cut to virtually any length. They are available in the following diameters: 1/8", 1/4", 1/2", 3/4". Anode coatings may be selected to match fresh water, brackish water, seawater, coke, or sand environments.

MMO Wire & Ribbon Anodes

MMO anodes are available with Wire or Ribbon shapes. The titanium used in manufacturing meets ASTM B348 for wire and ASTM B265 for ribbon. The titanium is coated using Mixed Metal Oxide Coating suitable for the application. MMO wire anodes can be supplied in canister.

MMO Wire anodes are designed for applications in:

Canistered anodes
Continuous horizontal groundbeds
Discounting horizontal groundbeds
Shallow vertical groundbeds
Above ground storage tanks
Underground storage tanks
Natural water
Electrical cable shielding
Water storage tanks
Water treatment equipement

MMO Wire Anode Dimensions

1.5mm diameter – 75,537 micro-ohms/ft
3.0mm diameter – 18,884 micro-ohms/ft

MMO Solid Ribbon Anode Dimensions

Width: .25” (6.35mm)
Thickness: .025” (.635mm)
Standard Coil Length: 328 ft (100m)
Standard Coil Weight: 2.5 lbs (1.12kgs)
Surface Area of Ribbon: 0.014m2 per m
Current Output of Ribbon in Fine Sand: 12.8mA/ft (42mA/m) when operating at an anode current density of .278 A/ft2 (3A/m2)

MMO Mesh Strip Anodes

Mesh strip anodes are manufactured using titanium expanded mesh substrate, which meets ASTM B265 Grade 1 or 2 standards, and MMO Coating.

Mesh strip anodes are 1.25" wide x 48" long and are rated 5 amps for a 20 year design life in calcined petroleum coke. The MESH STRIP ANODE can be packaged in a spiral wound, galvanized steel canister or a fabric sleeve.

Graphite Anodes


Graphite Anode

Graphite anodes have been a standard for cathodic protection for many years. They are considered a reliable impressed current anode and are used extensively throughout the industry. Being a porous metal, gases produced in the internal pores and result in mechanical & chemical deterioration of the anode that cause softening & swelling. Therefore graphite anodes supplied after treating by oil, wax or resin, then the penetration of the electrolyte reduced and mechanical strength is increased.

Low in cost, graphite anodes, used in conjunction with carbon anode backfill, provide long-term performance characteristics for many cathodic protection applications.

Standard Composition

Composition, ASTM A518 Grade 3

Element
Percentage, Weight %
Carbon
99.80%
Ash
0.20%

Standard Dimensions

Diameter
Length
Wt. Kg
Wt. Lbs
3"
30"
5.90
13

3"
60"

12.26
27
4"
40"
14.07
31
4"
80"
28.19
62

Graphite anodes can be supplied with all required extras;

HMWPE cable attachment with specific cable length
Canister with carbonaceous backfill
Heat shrink caps
Ropes or suspension assembly
Centralizers
Client specific requirements

AnodeFlex Anode System


AnodeFlex Anode

AnodeFlex is an impressed current, flexible cable anode system for use in cathodic protection of buried structures. Placed alongside a pipe or other buried metal structure, AnodeFlex provides uniform cathodic protection to every point, with a minimum of interference from adjacent structures.

The four basic elements in the AnodeFlex system:

A high performance coke breeze serving as the active matrix in which the anodic reactions take place.
A copper conductor serving as a low resistance busbar to deliver the required urrent over considerable distance without incurring substantial longitudinal voltage drop.
A special conductive polymer that seal the conductor from chemical attack, yet allows current to flow from the conductor to the environment all along its length.
A fabric jacket to hold the coke breeze in place around de anode cable. This jacket is designed to resist electrochemical attack, but to allow current flow from de anode to the surrounding soil.

To get more information about AnodeFlex®, kindly contact AFIC sales department.

Pyramid (Marine) Anode


AFIC Pyramid Anode

AFIC introduces to its customers an innovation for cathodically protecting offshore marine structures-the PYRAMlD (marine) anode.

Specially developed by AFIC's cathodic protection specialists for Aramco offshore use, the PYRAMID anode marks a major advancement in anode technology in terms of performance and low cost for impressed current systems applied offshore.

The anode consists of a four-vaned titanium substrate coated in a mixed metal oxide electro conductive film mounted on a high-density waterproof concrete pyramid to provide negative buoyancy and sea-bottom stability. Water seals are designed to established engineering principles and do not rely upon the dubious effectiveness of fillers, mastics resins and the like.

The anode comes fully assembled with special double-armoured insulated cable and requires only the installation contractor to lower the anode onto the seabed and terminate the onshore end of the cable, resulting in minimal installation time, and further cost savings.
The standard unit is rated at 170 amps max but other ratings are available.

The PYRAMID (marine) ANODE is ideally suited for platforms, sheet piling, jetty piles and all similar offshore facilities. AFIC is confident that the PYRAMID ANODE will attract extensive interest for offshore cathodic protection applications.

To get more information about PYRAMID anode, kindly contact AFIC sales department.










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