TYPICAL MAGNESIUM ANODE SIZES
(Cross sections may be round, square, or D shaped)
NOMINAL GROSS
NOMINAL
APPROX.
WT LBS PACKAGED
NOMINAL PACKAGE
WT. LBS.
SIZE (IN)
IN BACKFILL
DIMENSIONS (IN)
9
3 X 3 X 14
27
5 1/4 X 20
12
4 X 4 X 12
32
7 1/2 X 18
17
4 X 4 X 17
45
7 1/2 X 24
32
5 X 5 X 20 1/2
68
8 1/2 X 28
50
7 X 7 X 16
100
10 X 24
2.5.1
Anode shall be of high potential magnesium alloy, made of primary magnesium
obtained from sea water or brine, and not from scrap metal. Magnesium
anodes shall conform to ASTM B 843 and to the following analysis unless
otherwise indicated:
Element
Percent by Weight
Aluminum
0.02
maximum
1.50
maximum
Zinc
0.05
Silicon
0.10
maximum
Copper
0.02
maximum
Nickel
0.002 maximum
Iron
0.03
maximum
0.30
maximum
Magnesium
Remainder
The Contractor shall furnish spectrographic analyses on samples from each
heat or batch of anodes used on this project.
2.5.2
Packaged Anodes
Anodes shall be provided in packaged form with the anode surrounded by
specially prepared quick-wetting backfill and contained in a cloth or paper
sack. Anodes shall be centered in the backfill material. The backfill
material shall have the following composition, unless otherwise indicated.
Material
Percent by Weight
Gypsum
75
Bentonite
20
Sodium Sulfate
5
2.5.3
Lead Wires
Anode lead wires shall consist of No. 10 solid copper wire, with TW
insulation. Lead wires shall be not less than 3 m 10 feet in length,
without splices.
2.5.4
Connection Wires
Wires shall consist of No. 10 solid copper wire with RHW-USE or
polyethylene insulation.
SECTION 13112A
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