Sacrificial Anodes
for Tanks and Process Vessels

Standard Process Vessel Anode Dimensions and Weights

	Anode Type Net Weight (lb) Net Weight (kg) D (mm) La (mm) Lc (mm) Current Output * (Amps) Life @ Max Current Output (yrs) # DWHT 37 17 76 1524   2.7 1.6 D-8x9 44 20 203 229 102 1.7 3.0 Ds-49 47 21 249   330 1.6 3.3 * Current in 22 ohm-cm seawater verrsus cathode potential of -0.800V vs Ag/AgCl. sw. # Current and life may vary significantly in elevated temperature brines

Available Zinc and Aluminum Alloys

- The Deep7 aluminum alloy was designed as an effective, offshore alloy, for use in cold, deep water environments. The low Iron (Fe) content of the alloy ensures that it activates in lower temperatures and protects the platform or pipeline it is connected to for the designed life of the cathodic protection system.

- The Deep10 aluminum alloy was designed as an effective, general purpose offshore alloy, for use in tropical water environments. In cold, deep water, the Deep7 alloy is more effective, as it has a lower Iron (Fe) content.

ZINC MIL-A-18001-K - MIL Spec alloys are ideal for fresh or brackish water.

Alloy Type			ZINC MIL-A-18001-K
Iron (Fe)	0.07 max	0.10 max	0.005 max
Silicon (Si)	0.10 max	0.10 max	N/A (0.00)
Copper (Cu)	0.003 max	0.006 max	0.005 max
Zinc (Zn)	4.75 - 5.25	2.0 - 6.0	remainder
Indium (In)	0.015 - 0.025	0.01 - 0.05	N/A (0.00)
Titanium (Ti)	0.025 max	0.025 max	N/A (0.00)
Others (each)	0.02 max	0.02 max	0.10 max
Aluminum (Al)	remainder	remainder	0.1 - 0.5
Lead (Pb)	N/A (0.00)	N/A (0.00)	0.006 max
Cadmium (Cd)	N/A (0.00)	N/A (0.00)	0.025 - 0.07

Electrochemical Properties

Alloy Type			ZINC MIL-A-18001-K
Open Circuit Potential	(-) 1.08 V vs Ag/AgCl sw.	(-) 1.08 V vs Ag/AgCl sw.	-1.05 Volts (Ag/AgCl)
Closed Circuit Potential(1)	(-) 1.05 V vs Ag/AgCl sw,	(-) 1.05 V vs Ag/AgCl sw,	N/A
Seawater Capacity @25C	1100 A-Hr/lb. (2420 A-Hr/Kg.)	1100 A-Hr/lb. (2420 A-Hr/Kg.)	N/A
Seawater Capacity @ 5C	1100 A-Hr/lb. (2420 A-Hr/Kg.)	Variable (2)	N/A
Seabed Mud Capacity (3)	950 A-Hr/lb (2090 A-hr/Kg.)	950 A-Hr/lb (2090 A-hr/Kg.)	N/A
Seabed Mud Capacity @ 5C	950 A-Hr/lb (2090 A-hr/Kg.)	Variable (2)	N/A
Nominal Current Capacity	N/A	N/A	780 amp-hr/kg

Physical Properties

Alloy Type
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 & Conversion	1.10	1.00

Recommended Applications

Alloy Type
Produced Water Vessels & Tanks	Any produced brine < 140 F(60 C)(1). No improvement over Deep 10 alloy.	Any produced brine < 140 F(60 C)(1)
Seawater Ballast Tanks	Suitable for most seawater applications (2). No improvement over Deep 10 alloy.	Suitable for most seawater applications (2).

1 - Consult a CP Specialist for guidance at elevated temperatures as performance de-rating will be needed.

2 - 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.