1.4
Services of Corrosion Engineer
The Contractor shall obtain the services of a Corrosion Engineer to
supervise, inspect and test the installation of the cathodic protection
system(s). Corrosion Engineer refers to a registered professional engineer
with certification or licensing that includes education and experience in
cathodic protection of buried or submerged metal structures, or a person
certified by the National Association or Corrosion Engineers at the level
of Corrosion Specialist or Cathodic Protection Specialist. Such a person
shall have not less than [three] [five] [_____] years experience in the
cathodic protection of water [storage tanks] or submerged structures. The
contractor shall submit evidence of the qualifications of corrosion engineer
to the Contracting Officer for review and approval.
PART 2
PRODUCTS
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NOTE: Anode materials, as well as all cathodic
protection equipment to be installed in the tank,
should be chosen such that there is no contamination
of potable water. The type of system to be used,
either impressed current or galvanic, must be
determined. Select the paragraphs entitled
"Impressed Current Anodes" or "Galvanic Anodes"
below.
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[2.1
Impressed Current Anodes
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NOTE: Choose from anodes listed below. The
chemical composition listed are examples only. The
actual compositions required shall be determined to
provide adequate and economical service.
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2.1.1
High-Silicon Chromium Bearing Cast Iron
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NOTE: High-silicon cast iron anodes are rugged,
long lasting, and commonly used in icing and
non-icing climates. They are generally classified
as relatively non-sacrificial having a consumption
rate between 227 to 454 grams 0.5 to 1.0 pounds per
ampere-year in most fresh waters.
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Provide cast iron anodes of the following composition and size as indicated.
a.
[ASTM A 518M] [ASTM A 518] [Chemical composition:
Carbon
0.70 - 1.10 percent
1.50 percent maximum
Silicon
14.20 - 14.75 percent
3.25 - 5.00 percent
Copper
0.50 percent maximum
Molybdenum
0.20 percent maximum
Iron
Remainder]
SECTION 13112N
Page 8
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