2.2.14
Electrical connections shall be done as follows:
a. Exothermic welds shall be ["Cadweld",] [" Bundy",] ["Thermoweld",]
[or] [an approved equal]. Use of this material shall be in strict
accordance with the manufacturer's recommendations.
b. Electrical-shielded arc welds shall be approved for use on steel
pipe by shop drawing submittal action.
c.
Brazing shall be as specified in Paragraph:
Lead Wire Connections.
2.2.15
Electrical Tape
Pressure-sensitive vinyl plastic electrical tape shall conform to UL 510.
2.2.16
Permanent Reference Electrodes
Permanent reference electrodes shall be Cu-CuS04 electrodes suitable for
direct burial. Electrodes shall be guaranteed by the supplier for 15
years' service in the environment in which they shall be placed.
Electrodes shall be installed directly beneath pipe, or metallic component.
2.2.17
Casing
**************************************************************************
NOTE: This paragraph will be deleted if mechanical
and electrical specifications include these
requirements.
**************************************************************************
Where a pipeline is installed in a casing under a roadway or railway, the
pipeline shall be electrically insulated from the casing, and the annular
space sealed and filled with an approved corrosion inhibiting product
against incursion of water.
PART 3
EXECUTION
3.1
CRITERIA OF PROTECTION
Acceptance criteria for determining the adequacy of protection on a buried
underground [pipe] [tank] [metallic component] shall be in accordance with [
NACE RP0169] [NACE RP0193] [NACE RP0285] and as specified below.
3.1.1
Iron and Steel
The following method a. shall be used for testing cathodic protection
voltages. If more than one method is required, method b. shall be used.
a. A negative voltage of at least minus 850 millivolts as measured
between the underground component and a saturated copper-copper
sulphate reference electrode connecting the earth (electrolyte)
directly over the underground component. Determination of this voltage
shall be made with the cathodic protection system in operation.
Voltage drops shall be considered for valid interpretation of this
voltage measurement. A minimum of minus 850 millivolts "instant off"
potential between the underground component being tested and the
SECTION 13110A
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