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Aluminum Indium Anode
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Aluminium anodes
The galvanic alloy used for offshore anodes shall be an aluminium-zinc-indium (AlZnIn) alloy suitable for operation as a galvanic anode in seawater and/or seabed sediment and shall be suitable for cold or deep water use (note that deepwater is defined as >300m and cold as <10°C) in the Caspian Sea.
Anodes with high current output capacity.
Aluminum alloyed sacrificial anodes with high efficiency, ideal for seawater conditions. Available in numerous shapes and sizes, with various mounting options, suitable for all submerged structures.
AlZnIn GACP anodes are in accordance with ISO 15589-2, supported and refined by DNVGL-RP-B401 and NACE SP0169. AlZnIn GACP bracelet anodes are in accordance with ISO 15589-2, supported and refined by DNVGL-RP-F103 and NACE SP0169.
Anode materials shall fulfil the requirements of ISO 15589-2 and DNVGL-RP-B401. Anode materials for all type anodes are fulfil the requirements of ISO 15589-2, DNVGL-RP-F103, and BS EN ISO 12496.
Customization
Anodes can be customized to fit almost any requirement.
Type approval
The aluminum alloyed anodes comply with the DNVGL DNVGL-CP-0107 – sacrificial anode materials, Det Norske Veritas’ Recommended Practices, DNVGL-RP-B401.
The anodes can be provided in accordance with the NORSOK M-503 and/or DNVGL-RP-B401. Other standards can be met upon request.
The EDOPEC range of aluminum anodes is designed for use in a wide range of applications. Typical applications are pipelines, storage tank internals, offshore platforms, ships tanks, etc. The range is wide and we give below typical dimensions.Alternative dimensions and weights are available to suit your specific requirements. Attachment may be by direct welding or by purpose made clamps designed to suit the particular application. The following alloy specifications are widely used.
The AlZnIn anode material shall be a proven aluminum-zinc-indium based alloy suitable for long term continuous service in sea water, saline mud or alternating sea water and saline mud environments and shall, as a minimum, comply with the tighter chemical composition from DNVGL-RP-F103 as indicated below:
|
Alloy Composition |
Alloy A |
Alloy B |
Alloy C |
|
Zinc |
3.5-5.0 |
0.5-6.0 |
0.3-0.8 |
|
Aluminium |
Balance |
Balance |
Balance |
|
Magnesium |
- |
0.02 max |
- |
|
Copper |
0.01 max |
0.005 max |
0.005 max |
|
Silicon |
0.05-0.2 |
0.1 max |
0.2 max |
|
Iron |
0.15 max |
0.13 max |
0.12 max |
|
Titanium |
0.01-0.05 |
0.02 max |
0.05 max |
|
Mercury |
- |
- |
0.03-0.06 |
|
Bismuth |
0.05-0.15 |
- |
- |
|
Indium |
0.02-0.05 |
0.01-0.05 |
- |
|
Nominal Capacity AH/kg |
2700 |
2550 |
2830 |
|
Solution Potential (mV) |
-1100 |
-1080 |
-1050 |
|
Density (kg/m3) |
2710 |
2700 |
2660 |
The anode current capacities and closed-circuit potentials of the proposed aluminium-zinc-indium alloy in seawater, as determined from the electrochemical tests required in this specification, at all anode current densities shall be as recommended in ISO 15589-2, DNVGL-RP-B401 and DNVGL-RP-F103 and indicated below:
|
Closed Circuit Potential |
Seawater: min. -1.050V wrt Ag/AgCl/seawater reference electrode Sediments: min. -1.000V wrt Ag/AgCl/seawater reference electrode |
|
Minimum Capacity |
Seawater: 2500 Amp.hours per kg at 30oC (Test data only) Seawater: 2000 Amp.hours per kg at 30oC (Practical) Sediments: 2000 Amp.hours per kg at 30oC (Test data only) Sediments: 1500 Amp.hours per kg at 30oC (Practical) |
Alloy A Alloy A is suitable for use on buried pipelines, coated sub-sea structures, offshore jackets and general piled structures. It can be used at low current densities and elevated temperatures.
Alloy B Alloy B is a general purpose anode alloy based on Aluminum and Zinc and is used for general sea water applications at normal temperature.
Alloy C Alloy C is also a general purpose alloy using mercury to give an improved efficiency at a lower solution potential. It is not suitable for high temperature applications. This alloy is now not used often because of the mercury content and the effect on the environment.
Please see the more detail from(EDO-DRG-COE-COR-INT-XXX-020-881-1724-Rev-A-AL-IN-ZN ANODE DETAIL EDO-AL-IN-ZN-RND15100-BOLTED ANODES) this link.
Please see more detail the following links
EDO-DRG-COE-COR-INT-XXX-020-877-1720-Rev-A-HUGE STRUCTURAL AL-IN-ZN ANODE DETAIL EDO-AL-IN-ZN-XXX.pdf
EDO-DRG-COE-COR-INT-XXX-020-878-1721-Rev-A-SEA SHIP TYPE AL-IN-ZN ANODE DETAIL EDO-AL-IN-ZN-XXX.pdf
EDO-DRG-COE-COR-INT-XXX-020-879-1722-Rev-A-HEATER TYPE AL-IN-ZN ANODE DETAIL EDO-AL-IN-ZN-XXX.pdf
EDO-DRG-COE-COR-INT-XXX-020-880-1723-Rev-A-OFFSHORE PILES AL-IN-ZN ANODE DETAIL EDO-AL-IN-ZN-XXX.pdf
