Platform anodes
Sacrificial aluminum anodes for fixed structures
Deepwater’s aluminum anodes are designed specifically for the offshore oil and gas industry.
Deepwater's aluminum platform anodes are cast in low-iron, high-purity aluminum alloys and can be manufactured in a wide variety of configurations for new construction or retrofitting. Most standard configurations are available. In addition to these, Deepwater can cast anodes with bulk trapezoidal cross-sections to any specifications required.
Dimensions
| Anode type (straight core) | Anode type (90° core) | Anode type (45° core) | Gross weight (kg) | Net weight (kg) | L (mm) | W1 (mm) | W2 (mm) | T (mm) | Lc (mm) |
|---|---|---|---|---|---|---|---|---|---|
| A59.0S1 | -BC90 | -BC45 | 68.3 | 59 | 750 | 160 | 220 | 169 | 1170 |
| A148.0S1 | -BC90 | -BC45 | 164.5 | 148 | 1600 | 180 | 225 | 184 | 2600 |
| A320.0S1 | -BC90 | -BC45 | 389.0 | 320 | 2500 | 220 | 265 | 238 | 3100 |
| A356.0S1 | -BC90 | -BC45 | 423.1 | 356 | 2440 | 230 | 290 | 247 | 3050 |
| A533.0S1 | -BC90 | -BC45 | 603.0 | 533 | 2570 | 310 | 335 | 270 | 4600 |
| Deep 7 (Aluminum - Deep Water) | Deep 10 (Aluminum - Shallow Water) | ||
|---|---|---|---|
| Iron (Fe) | 0.07 max | Iron (Fe) | 0.10 max |
| Silicon (Si) | 0.10 max | Silicon (Si) | 0.10 max |
| Copper (Cu) | 0.003 max | Copper (Cu) | 0.006 max |
| Zinc (Zn) | 4.75 - 5.25 | Zinc (Zn) | 3.00 - 6.00 |
| Indium (In) | 0.015 - 0.025 | Indium (In) | 0.010 - 0.020 |
| Titanium (Ti) | 0.025 max | Titanium (Ti) | 0.025 max |
| Cadmium (Cd) | Part of others | Cadmium (Cd) | Part of others |
| Others (each) | 0.02 max | Others (each) | 0.02 max |
| Aluminum (Al) | Remainder | Aluminum (Al) | Remainder |
| Alloy type | Deep 7 | Deep 10 |
|---|---|---|
| Open circuit potential | (-) 1.08 V vs Ag/AgCl sw. | (-) 1.08 V vs Ag/AgCl sw. |
| Closed circuit potential(1) | (-) 1.05 V vs Ag/AgCl sw, | (-) 1.05 V vs Ag/AgCl sw, |
| Seawater capacity @25C | 1100 A-Hr/lb. (2420 A-Hr/Kg.) | 1100 A-Hr/lb. (2420 A-Hr/Kg.) |
| Seawater capacity @ 5C | 1100 A-Hr/lb. (2420 A-Hr/Kg.) | Variable (2) |
| Seabed mud capacity (3) | 950 A-Hr/lb (2090 A-hr/Kg.) | 950 A-Hr/lb (2090 A-hr/Kg.) |
| Seabed mud capacity @ 5C | 950 A-Hr/lb (2090 A-hr/Kg.) | Variable (2) |
| Alloy density | 0.098 lb/in3 (2.71 gm/cm3) | 0.098 lb/in3 (2.71 gm/cm3) |
| Cost ratio | Low Iron (Fe) Aluminum (Al) Ingot < 0.05 Fe |
Normal Grade Al Sows |
| Raw material and conversion | 1.10 | 1.00 |
| Recommended environment | Any ocean. any depth. any temperature. | Any tropical ocean < 600 fsw (180 Msw) with mean water temperature higher than 45 F (7C). |
1. Recommended number to use when designing CP systems.
2. Activation can be a problem with chemistries at extremes of specification in cold water.
3. Recommended number to use when designing CP systems for offshore pipelines using bracelet or sub-bottom anode systems.
Consult a CP specialist for guidance at elevated temperatures as performance de-rating will be needed.
Exercise care with variable ballast tanks, as dangerous volumes of hydrogen can be generated under certain conditions.
For additional guidance in application of these alloys, please contact Deepwater.
Gallery
Diver installed
Dual clamp on anodes installed on the shallow portions of the structure.
Replace depleted anodes
Dual clamp-on anodes are designed to replace platform anodes on structural members.
Supplemental current
On deeper structures, it is sometimes necessary to use a combination of Retropods on the sea floor and Dual clamp-ons near the surface.
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