Half Shell Aluminum Bracelet Anode (Square End, Welded)

This indium-activated aluminium bracelet anode is specifically designed for the cathodic protection of submarine/offshore pipelines. Assembled as two half-shells, the anodes fit the pipe as a bracelet and shall be installed by thermit-welding. With square end, our half-shell aluminium bracelet anodes are suitable for flush fitting with concrete coating.

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Quality Substrate Material
Casted in low-iron, high-purity alloys, our bracelet anode is designed as per the standard of ISO, NACE, DNV.

Element GALVALUM III DNV-RP-B401-2011 GS EP COR 201
Zinc (Zn) 2.0% ~ 6.0% 2.5% ~ 5.75% 4.75% ~ 5.75%
Indium (In) 0.01% ~ 0.02% 0.015% ~ 0.04% 0.015% ~ 0.02%
Silicon (Si) 0.08% ~ 0.2% 0.12% max. 0.06% ~ 0.12%
Iron (Fe) 0.13% max. 0.09% max. 0.12% max.
Copper (Cu) 0.006% max. 0.003% max. 0.003% max.
Cadmium (Cd) 0.002% max. 0.002% max.
Total Impurities 0.1% max. 0.1% max. 0.1% max.
Aluminum (Al) Remainder Remainder Remainder

Low Driving Voltage
This aluminium bracelet anode provides a stable performance in seawater and electrolytes containing chloride ions as its operating potential is kept between -1.05 to -1.10 volts relative to saturated calomel electrode(SCE).

Technical Measurement Performance
Open Circuit Voltage (-V) 1.10 min.
Closed Circuit Voltage (-V) 1.05 min.
Current Capacity 1135 A.h/lbs (2500 A.h/kg)
Current Efficiency 90% min.
Consumption Rate 7.6 lbs/A·y (3.4 kg/A·y)

Customized Configurations
The overall dimension of the anodes are usually manufactured to coincide with the overall dimension of the pipe. A range of standard bracelet anodes are illustrated below, custom-made configurations are available upon request.

Item No. Anode Dimensions Anode Gap Weight
Inner Diameter Length Thickness N.W G.W
JA-AL-BLW01 6.9” (175 mm) 19.5” (495 mm) 1.6” (40 mm) 2.0” (50 mm) 62.8 lbs (28.5 kg) 66.1 lbs (30.0 kg)
JA-AL-BLW02 8.7” (220 mm) 16.3” (415 mm) 1.8” (45 mm) 2.0” (50 mm) 88.2 lbs (40.0 kg) 93.7 lbs (42.5 kg)
JA-AL-BLW03 10.8” (275 mm) 21.7” (550 mm) 2.0” (50.8 mm) 2.0” (50 mm) 137.8 lbs (62.5 kg) 149.9 lbs (68.0 kg)
JA-AL-BLW04 12.8” (325 mm) 18.9” (480 mm) 1.6” (40 mm) 2.0” (50 mm) 112.4 lbs (51.0 kg) 121.3 lbs (55.0 kg)
JA-AL-BLW05 13.2” (336 mm) 31.6” (802 mm) 1.2” (30 mm) 2.0” (50 mm) 121.3 lbs (55.0 kg) 125.7 lbs (57.0 kg)
JA-AL-BLW06 16.0” (406 mm) 13.8” (350 mm) 2.6” (65 mm) 2.0” (50 mm) 178.6 lbs (81.0 kg) 187.4 lbs (85.0 kg)
JA-AL-BLW07 18.0” (457 mm) 21.7” (550 mm) 2.0” (51 mm) 2.0” (50 mm) 275.6 lbs (125 kg) 282.2 lbs (128 kg)
JA-AL-BLW08 20.1” (510 mm) 9.8” (250 mm) 2.6” (65 mm) 2.0” (50 mm) 162.0 lbs (73.5 kg) 177.5 lbs (80.5 kg)
JA-AL-BLW09 21.1” (536 mm) 28.1” (714mm) 1.5” (38 mm) 2.0” (50 mm) 230.4 lbs (104.5 kg) 238.1 lbs (108 kg)
JA-AL-BLW10 24.0” (610 mm) 16.1” (410 mm) 2.0” (51 mm) 2.0” (50 mm) 233.7 lbs (106 kg) 257.9 lbs (117 kg)
JA-AL-BLW11 27.3” (694 mm) 12.6” (320 mm) 1.6” (40 mm) 2.0” (50 mm) 120.2 lbs (54.5 kg) 127.9 lbs (58.0 kg)
JA-AL-BLW12 27.5” (698 mm) 16.0” (406 mm) 2.7” (68 mm) 3.0” (75 mm) 294.3 lbs (133.5 kg) 304.2 lbs (138 kg)

 

Main Technical Parameters

Shape

Bracelet

Substrate

Aluminium

Environment

Seawater

Application

Pipelines

Testing

We employ ISO 9001:2015 quality management system and rigorous internal testing standards to ensure the optimum lifespan and performance of our anodes. Each anode is labelled with a unique serial number for quality tracking.

Testing Details Chemical Composition Electrochemical Performance Physical Properties
Testing Standard DNV-RP-B401 NACE TM0190 Foundry ITP
Testing Content Chemical Analysis Circuit Potential / Current Capacity / Current Efficiency / Electrical Resistance Dimension & Weight / Surface Finish / Steel Insert
Equipments Optical Emission Spectrometer OBLF QSN 750 Electrochemical Analyzer EPI 200 Calibrated Digital Measuring Devices

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