locations of these measurements shall be identical to the locations used
for baseline potentials. The values obtained and the date, time, and
locations of measurements shall be recorded. No less than 8 measurements
shall be made over any length of line or component. Additional
measurements shall be made at each distribution service riser, with the
reference electrode placed directly over the service line.
3.5.5
Location of Measurements
3.5.5.1
Coated Piping or Conduit
For coated piping or conduit, measurements shall be taken from the
reference electrode located in contact with the earth, directly over the
pipe. Connection to the pipe shall be made at service risers, valves, test
leads, or by other means suitable for test purposes. Pipe to soil
potential measurements shall be made at intervals not exceeding [0.75]
[1.5] [122] [_____] m [2.5] [5] [400] [_____] feet. The Contractor may use
a continuous pipe to soil potential profile in lieu of 0.75 m 2.5 ft
interval pipe to soil potential measurements. Additional measurements
shall be made at each distribution service riser, with the reference
electrode placed directly over the service line adjacent to the riser.
Potentials shall be plotted versus distance to an approved scale.
Locations where potentials do not meet or exceed the criteria shall be
identified and reported to the Contracting Officer.
3.5.5.2
Underground Tanks
For underground tanks, measurements shall be taken from the reference
electrode located:
a.
Directly over the center of the tank.
b.
At a point directly over the tank and midway between each pair of
anodes.
c.
At each end of the tank.
A minimum of three measurements shall be made.
3.5.6
Casing Tests
Before final acceptance of the installation, the electrical separation of
carrier pipe from casings shall be tested and any short circuits corrected.
3.5.7
Interference Testing
**************************************************************************
NOTE: Adverse effects may be caused by the foreign
pipeline.
**************************************************************************
Before final acceptance of the installation, interference tests shall be
made with respect to any foreign [pipes] [tanks] in cooperation with the
owner of the foreign [pipes] [tanks]. A full report of the tests giving
all details shall be made.
3.5.8
Holiday Test
Any damage to the protective covering during transit and handling shall be
SECTION 13112A
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