1.3.9
Drawings
Detailed drawings shall be provided showing location of anodes, insulated
fittings, test stations, permanent reference cells, and bonding. Locations
shall be referenced to two (2) permanent facilities or mark points.
1.3.10
Electrical Potential Measurements
All potential tests shall be made at a minimum of 3 meter 10 foot intervals
witnessed by the Contracting Officer. Submittals shall identify test
locations on separate drawing, showing all metal to be protected and all
cathodic protection equipment. Test points equipment and protected metal
shall be easily distinguished and identified.
1.3.11
Achievement of Criteria for Protection
All conductors, unless otherwise shown, shall be routed to or through the
test stations. Each system provided shall achieve a minimum pipe-to-soil
"instant off" potential of minus 850 millivolt potentials with reference to
a saturated copper-copper-sulfate reference cell on all underground
components of the piping. Based upon the measurements taken, the current
and voltage of the anodes should 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 should be
obtained over 95 percent of the metallic area. This must be achieved
without the "instant off" potential exceeding 1150 millivolts. Testing
will be witnessed by the Contracting Officer. Additional anodes shall be
provided by the Contractor if required to achieve the minus 850 millivolts
"instant off". Although acceptance criteria of the cathodic protection
systems are defined in NACE RP0169, for this project the "instant off"
potential of minus 850 millivolts is the only acceptable criteria.
1.3.12
Metallic Components and Typicals
a. Metallic components: As a minimum, each metallic component shall
be protected with two (2) magnesium anodes. This number of anodes is
required to achieve minus 850 millivolts "instant off" potential on the
metallic area and at the same time not provide overvoltage above 1150
millivolts "instant off." As a minimum, the magnesium anode unpackaged
weight shall be [4.1] [7.7] [_____] kg [9] [17] [_____] pounds. The
magnesium anodes shall be located on each side of the metallic
component and routed through a test station.
b. Fire Hydrants: Fire hydrant pipe components shall have a minimum
of two (2) anodes. These magnesium anodes shall have an unpackaged
weight of 7.7 kg 17 pounds.
c. Pipe Under Concrete Slab: Pipe under concrete slab shall have a
minimum of [2] [3] [_____] magnesium anodes. These magnesium anodes
shall have an unpackaged weight of [4.1] [7.7] [_____] kg [9] [17]
[_____] pounds. Pipe under concrete slab shall have [1] [2] [_____]
permanent reference electrodes located under the slab. One (1)
permanent reference electrode shall be located where the pipe enters
the concrete slab. All conductors shall be routed to a test station.
d. Valves: Each valve shall be protected with [1] [2] [_____]
magnesium anodes. The magnesium anode shall have an unpackaged weight
of [4.1] [7.7] [_____] kg [9] [17] [_____] pounds.
SECTION 13110A
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