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High-Silicon Chromium Bearing Cast Iron

 
  
 
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 underground [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
2.1
ANODES
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NOTE:  The chemical compositions listed are examples
only.  The actual compositions required shall be
determined to provide adequate and economical
service.
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*
NOTE:  Options for anode materials include
"High-Silicon Chromium Bearing Cast Iron,"
"Graphite," and "Mixed Metal Oxide Coated" anodes.
Selection of material should be based upon the
conditions and operating parameters for the intended
use.  Precious metal or other anode materials,
packaging or connections may also be appropriate for
use, as determined by the engineer.  These
materials, packaging, or connections must also be
submitted for approval in accordance with
"Submittals Procedures."
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[2.1.1
High-Silicon Chromium Bearing Cast Iron
[ASTM A 518M][ASTM A 518], Grade 3.
[Chemical composition as follows:
Carbon
0.70 - 1.10 percent
Manganese
1.5 percent maximum
Silicon
14.20 - 14.75 percent
Chromium
3.25 - 5.00 percent
Copper
0.50 percent maximum
Molybdenum
0.20 percent maximum
Iron
Remainder
Anode dimensions:  [_____] by [_____] mm. inches.  [Centrifugally cast
tubular anodes with uniform wall thickness, [_____] mm inches long, [_____]
mm inches outer diameter, [_____] square meter feet surface area, and
[_____] kg lb bare anode weight.]]
][2.1.2
Graphite
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NOTE:  Maximum allowable current densities for anode
surface area are as follows; Seawater:  40.37 amps
per square meter 3.75 amps per square foot, Fresh
water:  2.69 amps per square meter 0.25 amps per
square foot, and Soil (anode placed in backfill):
SECTION 13111N
Page 10


   


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