e. Metallic Pipe Component or Section: Each section of metallic pipe
shall be protected with [2] [3] [_____] magnesium anodes. The
magnesium anodes shall have an unpackaged weight of [4.1] [7.7] [_____]
kg [9] [17] [_____] pounds.
f. Connectors or Change-of-Direction Devices: Each
change-of-direction device shall be protected with [2] [3] [____]
magnesium anodes. The magnesium anode shall have an unpackaged weight
of [4.1] [7.7] [_____] kg [9] [17] [_____] pounds.
1.3.13
Metallic Component Coating
Coatings for metallic components shall be as required for metallic fittings
as indicated. This will include fire hydrants, T's, elbows, valves, etc.
Coatings shall be selected, applied, and inspected in accordance with NACE
RP0190 and as specified in these specifications.
PART 2
PRODUCTS
2.1
MAGNESIUM ANODES
A minimum of [2] [3] [10] [12] [_____] anodes shall be installed on the
[Pipe] [Tank] [_____] system. See Paragraph METALLIC COMPONENTS AND
TYPICALS for additional anodes under slab.
2.1.1
Anode Composition
Anodes shall be of high-potential magnesium alloy, made of primary
magnesium obtained from sea water or brine, and not made from scrap metal.
Magnesium anodes shall conform to ASTM B 843 and to the following analysis
(in percents) otherwise indicated:
Aluminum, max.
0.010
Manganese, max.
0.50 to 1.30
Zinc
0.05
Silicon, max.
0.05
Copper, max.
0.02
Nickel, max.
0.001
Iron, Max.
0.03
Other impurities, max.
0.05 each or 0.3 max. total
Magnesium
Remainder
The Contractor shall furnish spectrographic analysis on samples from each
heat or batch of anodes used on this project.
2.1.2
Dimensions and Weights
Dimensions and weights of anodes shall be approximately as follows:
TYPICAL MAGNESIUM ANODE SIZE
(Cross sections may be round, square, or D shaped)
NOMINAL GROSS
NOMINAL
APPROX.
WT kg PACKAGED
NOMINAL PACKAGE
WT. kg.
SIZE (mm)
IN BACKFILL
DIMENSIONS (mm)
_________________________________________________________________________
1.4
76 X 76 X 127
3.6
133 X 133 X 203
SECTION 13110A
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