b.
A negative polarized potential of at least 0.85 volt (850
millivolts) as measured between the structure surface and a
saturated copper-copper sulfate reference electrode contacting the
earth [electrolyte]. Determination of this voltage is to be made
after the protective current has been applied to the [structure]
[tank] [pipeline] for a minimum of [24] [_____] hours.
c.
A minimum polarization voltage shift of 100 mV measured between
the structure surface and a saturated copper-copper sulfate
reference electrode contacting the earth [electrolyte]. This
voltage shift shall be determined by interrupting the protective
current and measuring the polarization decay. At the instant the
protective current is interrupted ("instant off"), an immediate
voltage shift will occur. The voltage reading just after the
immediate shift shall be used as the base reading from which to
measure the polarization decay. The polarization decay shall be
the difference between the base reading and a voltage measurement
made [24] [48] [_____] hours after the interruption of protective
current.
3.3
DEMONSTRATION
3.3.1
Instructing Government Personnel
**************************************************************************
NOTE: There are restrictions on the type and extent
of training. Training is usually on-site, 2 days or
less. Factory representatives or others provide
basic instructions to facility maintenance and
operation personnel. If more extensive training is
required, i.e., student travel, special consultants,
etc., consult the Contract Division Director and the
head of the Comptroller Department for assistance.
**************************************************************************
During the warranty testing and at a time designated by the Contracting
Officer, make available the services of a technician regularly employed or
authorized by the manufacturer of the Cathodic Protection System for
instructing Government personnel in the proper operation, maintenance,
safety, and emergency procedures of the Cathodic Protection System. The
period of instruction shall be not less than [one] [_____] but not more
than [two] [_____] 8-hour working day[s]. Conduct the training at the
jobsite or at another location mutually satisfactory to the Government and
the Contractor. The field instructions shall cover all of the items
contained in the operation and maintenance manual.
3.4
SCHEDULE
Some metric measurements in this section is based on a mathematical
conversion of an English unit measurement, and not on metric measurement
commonly agreed upon by the manufacturers or other parties. The English
and metric units for the measurements shown are as follows:
Products
English Units
Metric Units
a.
Reference Electrodes
- Diameter
1 1/4 inches
32 mm
- Length
10 inches
255 mm
SECTION 13110N
Page 22
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