each type shall be furnished
PART 2
PRODUCTS
2.1
IMPRESSED CURRENT ANODES
2.1.1
High Silicon Cast Iron Anodes
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NOTE: High silicon cast iron anodes are rugged,
long lasting, and commonly used in icing and
non-icing climates. The anodes are less vulnerable
to damage and loss than other anodes where ice is
heavy and the tank level fluctuates over a wide
range. They are generally classified as relatively
non-sacrificial having a consumption rate between
0.2 to 0.5 kg per ampere year (0.5 to 1.0 pounds per
ampere year) in most fresh waters.
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Cast iron anodes shall be of the size indicated and shall conform to the
following requirements:
2.1.1.1
Chemical Composition (Nominal)
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NOTE: The two grades shown represent manufacturing
transition in practice. No significant difference
in performance is involved. Either grade may be
substituted for the other.
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Percent by Weight
Element
Grade 1
Grade 2
Silicon
14.20-14.75
14.20-14.75
1.50 max.
1.50 max.
Carbon
0.70-1.10
0.75-1.15
-------
3.25-5.00
Iron
Balance
Balance
2.1.1.2
Electrical Resistivity
Electrical Resistivity shall be 72 microhm-centimeter at minus 7 degrees C
20 degrees F (maximum).
2.1.1.3
Physical Properties (Nominal)
Tensile strength
103.4 MPa
Compressive strength
689.5 MPa
Brinell hardness
520
Density
7000 kilograms per cubic meter
Melting point
1260 degrees C
Coefficient of
expansion from 0 to
100 degrees C
132 nanometer per degree C
SECTION 13111A
Page 10
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