working days prior to each test. After backfill of the [pipe] [tank], the
static potential-to-soil of the [pipe] [tank] shall be measured. The
locations of these measurements shall be identical to the locations
specified for [pipe-] [tank-] to-reference electrode potential
measurements. The initial measurements shall be recorded.
3.5.2
Isolation Testing
Before the anode system is connected to the [pipe] [tank], an isolation
test shall be made at each isolating joint or fitting. This test shall
demonstrate that no metallic contact, or short circuit exists between the
two isolated sections of the [pipe] [tank]. Any isolating fittings
installed and found to be defective shall be reported to the Contracting
Officer.
3.5.2.1
Insulation Checker
A Model 601 insulation checker, as manufactured by ["Gas Electronics",]
[_____] [or] [an approved equal], using the continuity check circuit, shall
be used for isolating joint (flange) electrical testing. Testing shall
conform to the manufacturer's operating instructions. Test shall be
witnessed by the Contracting Officer. An isolating joint that is good will
read full scale on the meter. If an isolating joint is shorted, the meter
pointer will be deflected or near zero on the meter scale. Location of the
fault shall be determined from the instructions, and the joint shall be
repaired. If an isolating joint is located inside a vault, the pipe shall
be sleeved with insulator when entering and leaving the vault.
3.5.2.2
Cathodic Protection Meter
A Model B3A2 cathodic protection meter, as manufactured by ["M.C. Miller",]
[_____] [or] [an approved equal], using the continuity check circuit, shall
be used for isolating joint (flange) electrical testing. This test shall
be performed in addition to the Model 601 insulation checker. Continuity
is checked across the isolation joint after the test lead wire is shorted
together and the meter adjusted to scale. A full-scale deflection
indicates the system is shorted at some location. The Model 601 verifies
that the particular insulation under test is good and the Model B3A2
verifies that the system is isolated. If the system is shorted, further
testing shall be performed to isolate the location of the short.
3.5.3
Anode Output
As the anodes or groups of anodes are connected to the [pipe] [tank]
[_____], current output shall be measured with an approved clamp-on
milliammeter, calibrated shunt with a suitable millivoltmeter or
multimeter, or a low resistance ammeter. (Of the three methods, the
low-resistance ammeter is the least desirable and most inaccurate. The
clamp-on milliammeter is the most accurate.) The values obtained and the
date, time, and location shall be recorded.
3.5.4
Reference Electrode Potential Measurements
Upon completion of the installation and with the entire cathodic protection
system in operation, electrode potential measurements shall be made using a
copper-copper sulphate reference electrode and a potentiometer-voltmeter,
or a direct-current voltmeter having an internal resistance (sensitivity)
of not less than 10 megohms per volt and a full scale of 10 volts. The
locations of these measurements shall be identical to the locations used
SECTION 13110A
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