Canister Prepackaged High Silicon Cast Iron Anode

This canister anode consists of a tubular high silicon cast iron anode firmly pre-packaged in a large spirally wound galvanized mild steel canister that is filled with calcined petroleum coke backfill. The canister is capped with the cable which extends out the top of the anode cap.

The metallic canister housing is only intended to last through transportation and installation. Once installed, the exterior housing is part of the anode system and it is expected to be consumed quickly, leaving behind the anode and coke backfill. The stable anode element passes current to highly conductive coke backfill, and then the current is discharged from the external metallic housing.

Canistered pre-packed high silicon cast iron anodes are normally used in areas with a high water table or where it is difficult to install loose coke backfill which is normally provided around anodes. Our canistered high silicon cast iron anodes are a perfect impressed current cathodic protection material for low resistivity soils, shallow vertical and horizontal surface ground beds, as well as wet, marshy soil conditions where caving is likely to occur.

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Low Consumption Rate

Our tubular high silicon cast iron anode is centrifugal chill casted. The casting mold rotates at over 1000rpm producing a g-force that eliminates any trapped gas from silicon iron and throws any impurities to the inside bore of the anode where they do not hinder anode performance. Hence, the metal matrix is tight and dense; increasing the life of the anode.

Strengthened Canister Housing

The anode is installed in a spirally welding 0.65 mm thick galvanized steel canister. The canister is biodegradable and will corrode in service. It should be stored in a dry place before installation to avoid corrosion and perforation.

Uniform Coke Filled with Centralizer

The canister may be supplied in a variety of diameters and lengths to suit the specific anode/groundbed design. Preloaded canister ensures the anodes are evenly surrounded with the proper amount of compacted coke breeze backfill.

Low Ground Resistance

The coke backfill provides a homogenous environment for high silicon cast iron anode and can substantially lower the anode to earth resistance. It is an ideal cathodic protection material for high soil resistivity.

Easy Installation

Canister high silicon cast iron anodes reduce installation costs by providing the anode and coke backfill in a self contained package. The assembly process is finished within our foundary instead of in the field, which effectively guarantees field installation quality of anode bed.

Chemical Composition

Element ASTM A518 / A518M Grade 1 (Si – Fe) ASTM A518 / A518M Grade 3 (Si – Fe – Cr) BS 1591 1975
Silicon (Si) 14.2% ~ 14.75% 14.2% ~ 14.75% 14.25 ~ 15.25%
Chromium (Cr) 0.5% max. 3.25% ~ 5.0% 0.5% max.
Manganese (Mn) 1.5% max. 1.5% max. 0.5% max.
Copper (Cu) 0.5% max. 0.5% max.
Molybdenum (Mo) 0.5% max. 0.2% max.
Carbon (C) 0.65% ~ 1.1% 0.7% ~ 1.1% 1.4% max.
Phosphorus (P) 0.25% max.
Sulphur (S) 0.1% max.
Iron (Fe) Remainder Remainder Remainder

Note: ASTM A518 Grade 3 chemistry is particularly suited for electrolytes rich with chloride ions, where the level of chromium is elevated to enhance anode performance.

Electrochemical Properties

For anodes of the same chemistry and microstructure, variance in consumption is primarily due to the chemical and physical characteristics of the anode environment. The consumption rate does not appear to be significantly affected by current density (amperes per unit area of anode surface).

Environment Nominal Current Density Consumption Rate
Soil / Fresh Water 0.2 ~ 0.5 A/ft² (2 ~ 5 A/m²) 0.2 ~ 1.2 lbs/A.y (0.1 – 0.5 kg/A.y)
Coke Breeze 0.5 ~ 1 A/ft² (5 ~ 10 A/m²) 0.1 ~ 0.7 lbs/A.y (0.05 ~ 0.3 kg/A.y)
Seawater 1 ~ 5 A/ft² (10 ~ 50 A/m²) 0.7 ~ 1 lbs/A.y (0.3 ~ 0.5 kg/A.y)

Specification

Item No. Anode Type Anode Dimensions Canister Dimensions
JA-CSA-38 Solid Stick Φ1.5″/2.5″ x 60″ (Φ38/63 x1524 mm) Φ7.9″x78.7″(Φ200×2000 mm)
JA-CSA-51 Φ2″/3″ x 60″ (Φ51/76 x1524 mm) Φ7.9″x78.7″(Φ200×2000 mm)
JA-CSA-76 Φ3″/4″ x 60″ (Φ76/102 x1524 mm) Φ7.9″x78.7″(Φ200×2000 mm)
JA-CTA-58 Tubular Φ2.3″ x 84″ (Φ58×2134 mm) Φ7.9″x118.1″(Φ200×3000 mm)
JA-CTA-71 Φ2.8″ x 84″ (Φ71×2134 mm) Φ7.9″x118.1″(Φ200×3000 mm)
JA-CTA-96 Φ3.8″ x 84″ (Φ96x2134mm) Φ7.9″x118.1″(Φ200×3000 mm)
JA-CTA-124 Φ4.8″ x 84″ (Φ122x2134mm) Φ9.8″x118.1″(Φ250×3000 mm)

Remarks: All dimensions and weights shown are normal. Non-standard sizes and weights of the anode are available upon request.

Main Technical Parameters

Substrate

High Silicon Cast Iron

Application

Deep Well

Environment

Soil

Shape

Canister

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 ASTM E350 ASTM E186/E446 Foundry ITP
Testing Items Chemical Analysis Current Efficiency / Connection Resistance Dimension & Weight / Surface Finish / Cable Connection / Lead Wire Pulling Tension / Epoxy Resin Sealing
Equipments Optical Emission Spectrometer Labspark 750A / Thermoscientific Niton XL2-980 Electrochemical Analyzer EPI 200 Calibrated Digital Measuring Devices

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