augered-hole depth, anodes may be installed horizontally to a depth at
least as deep as the bottom of the pipe, with the approval of the
Contracting Officer.
3.2.4
Underground Pipeline
Anodes shall be installed at a minimum of 2.5 m
8 feet and a maximum of 3
m 10 feet from the line to be protected.
3.2.5
Installation Details
Details shall conform to the requirements of this specification. Details
shown on the drawings are indicative of the general type of material
required, and are not intended to restrict selection to material of any
particular manufacturer.
3.2.6
Lead Wire Connections
3.2.6.1
Underground Pipeline (Metallic)
To facilitate periodic electrical measurements during the life of the
sacrificial anode system and to reduce the output current of the anodes, if
required, all anode lead wires shall be connected to a test station and
buried a minimum of 610 mm 24 inches in depth. The cable shall be No. 10
AWG, stranded copper, polyethylene or RHW-USE insulated cable. The cable
shall make contact with the structure only through a test station.
Resistance wire shall be installed between the cable and the pipe cable, in
the test station, to reduce the current output, if required. Anode
connections, except in the test station, shall be made with exothermic
welding process, and shall be insulated by means of at least three (3)
layers of electrical tape; and all lead wire connections shall be installed
in a moistureproof splice mold kit and filled with epoxy resin. Lead
wire-to-structure connections shall be accomplished by an exothermic
welding process. All welds shall be in accordance with the manufacturer's
recommendations. A backfill shield filled with a pipeline mastic sealant
or material compatible with the coating shall be placed over the weld
connection and shall be of such diameter as to cover the exposed metal
adequately.
3.2.6.2
Resistance Wire Splices
Resistance wire connections shall be accomplished with silver solder and
the solder joints wrapped with a minimum of three (3) layers of
pressure-sensitive tape. Lead wire connections shall be installed in a
moistureproof splice mold kit and filled with epoxy resin.
3.2.7
Location of Test Stations
Test stations shall be of the type and location shown and shall be [curb
box] [post] [indoor] mounted. Buried insulating joints shall be provided
with test wire connections brought to a test station. Unless otherwise
shown, other test stations shall be located as follows:
a.
At 300 m 1,000-foot intervals or less.
b.
Where the pipe or conduit crosses any other metal pipe.
c.
At both ends of casings under roadways and railways.
SECTION 13110A
Page 24
Previous Page
