Way Ahead In Corrosion Control

Platform anodes

Sacrificial aluminum anodes for fixed structures

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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.

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Dimensions

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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 typeDeep 7Deep 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.

 

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