for baseline potentials. The values obtained and the date, time, and
locations of measurements shall be recorded. No less than eight (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
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 [1.5] [3]
[____] m [5] [10] [_____] feet. The Contractor may use a continuous
pipe-to-soil potential profile in lieu of 1.5 m 5 foot 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's representative.
3.5.5.2
Tanks
For underground tanks, at least [6] [_____] 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.
3.5.5.3
Casing Tests
Before final acceptance of the installation, the electrical separation of
carrier pipe from casings shall be tested and any short circuits corrected.
3.5.5.4
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. Stray current measurements shall be performed
at all isolating locations and at locations where the new pipeline crosses
foreign metallic pipes; results of stray current measurements shall also be
submitted for approval. The method of measurements and locations of
measurements shall be submitted for approval. As a minimum, stray current
measurements shall be performed at the following locations:
a.
Connection point of new pipeline to existing pipeline.
b.
Crossing points of new pipeline with existing lines.
SECTION 13110A
Page 28
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