between two adjacent anodes and hung clear of contact with such items
as ladders, heater pipes, and stay rods.
1.3.1
Contractor's Modifications
The Contractor may modify the cathodic protection system after review of
the project, site verification and analysis if the proposed modifications
include impressed current anodes and rectifiers and will provide better
overall system performance. The modifications shall be fully described,
shall be approved by the Contracting Officer and shall meet the following
criteria. The proposed system shall achieve a minimum "Instant Off"
potential of minus 850 millivolts with reference to a saturated
copper-copper sulfate reference cell on the tank components. The
Contractor shall take measurements and the current and voltage of the
rectifier shall be adjusted as required to produce a minimum of minus 850
millivolts "Instant Off" potential between the structure being tested and
the reference cell. This potential shall be obtained over 95 percent of
the metallic area without the "Instant Off" potential exceeding 1100
millivolts.
1.3.2
Services of "Corrosion Expert"
The Contractor shall obtain the services of a "corrosion expert" to
supervise and inspect the installation and performance of the cathodic
protection system. "Corrosion expert" refers to a person, who, by reason
of thorough knowledge of the physical sciences and the principles of
engineering and mathematics acquired by professional education and related
practical experience, is qualified to engage in the practice of corrosion
control on steel water tanks. Such a person must be accredited or
certified by the National Association of Corrosion Engineers (NACE) as a
NACE Accredited Corrosion Specialist or a NACE certified Cathodic
Protection (CP) Specialist or be a registered professional engineer who has
certification or licensing that includes education and experience in
corrosion control on steel water tanks, if such certification or licensing
includes 5 years experience in corrosion control on steel water tanks of
the type under this contract. The "corrosion expert" shall ensure that the
cathodic protection system is installed, tested, and placed into service in
accordance with the requirements specified; and shall also design, make
calculations, and assure quality control as required.
1.3.3
Verification of Site Conditions
The Contractor shall coordinate and properly relate this work to the work
of all trades. The general locations of the structures to receive
protection are shown. The Contractor shall visit the premises and become
familiar with all details of the work and working conditions, shall verify
existing conditions in the field, determine the exact locations of
structures to be protected, and advise the Contracting Officer of any
discrepancy before performing any work. The Contractor shall take
resistivity measurement of the water and analysis of the water and provide
this data with detail drawings of the system for approval.
1.3.4
Spare Parts
The Contractor shall submit spare parts data for each different item of
material and equipment specified, after approval of the detail drawings and
not later than [_____] months prior to the date of beneficial occupancy.
The data shall include a complete list of parts, special tools, and
supplies with current unit prices and source of supply. One spare anode of
SECTION 13111A
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