structure. Isolators shall be provided with lightning protection and a
test station as shown.
1.3.4
Anode and Bond Wires
A minimum of [5] [8] [25] [_____] magnesium anodes with an unpackaged
weight of [_____] kg pounds shall be provided uniform distances along the
metallic pipe lines. A minimum of [3] [5] [10] [_____] test stations shall
be used for these anodes. These anodes shall be in addition to anodes for
the pipe under concrete slab and casing requirements. For each cathodic
system, the metallic components and structures to be protected shall be
made electrically continuous. This shall be accomplished by installing
bond wires between the various structures. Bonding of existing buried
structures may also be required to preclude detrimental stray current
effects and safety hazards. Provisions shall be included to return stray
current to its source without damaging structures intercepting the stray
current. The electrical isolation of underground facilities in accordance
with acceptable industry practice shall be included under this section.
All tests shall be witnessed by the Contracting Officer.
1.3.5
Surge Protection
Approved zinc grounding cells or sealed weatherproof lightning arrestor
devices shall be installed across insulated flanges or fittings installed
in underground piping as indicated on the drawings. The arrestor shall be
gapless, self-healing, solid state type. Zinc anode composition shall
conform to ASTM B 418, Type II. Lead wires shall be number 6 AWG copper
with high molecular weight polyethylene (HMWPE) insulation. The zinc
grounding cells shall not be prepackaged in backfill but shall be installed
as detailed on the drawings. Lightning arrestors or zinc grounding cells
are not required for insulated flanges on metallic components used on
nonmetallic piping systems.
1.3.6
Summary of Services Required
The scope of services shall include, but shall not be limited to, the
following:
a.
Close-interval potential surveys.
b.
Cathodic Protection Systems.
c.
System testing.
d.
Casing corrosion control.
e.
Interference testing.
f.
Training.
g.
Operating and maintenance manual.
h.
Insulator testing and bonding testing.
i. Coating and holiday testing shall be submitted within 45 days of
notice to proceed.
SECTION 13110A
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