be conducted with fuel flowing through the pipeline to eliminate vapor
spaces within the pipe and to dissipate the heat on the pipe. Exothermic
weld charges for connections to fuel lines shall be limited to a maximum 15
gram charge to prevent burning through the pipe wall. Exothermic weld
connections shall be spaced a minimum of 6 inches apart. In the event of
an unsucceessful weld, the new weld location shall be located a minimum of
6 inches from the unsuccessful weld and any other existing welds.
Contractor shall obtain the services of a certified Marine Chemist or
Certified Industrial Hygienist [to monitor the construction site during
exothermic welding work and certify that the area is free of flammable
vapors and otherwise safe for work.] [to approve the contractor's
exothermic welding safety procedures. Results of this consultation shall
be included in the Contractor's Daily Report.]
3.1.3
Anode Junction Boxes
Provide junction boxes and mark each of the wires terminating in each box.
3.1.4
Bonding Boxes
Provide structure bonding boxes in locations [as indicated] [where the
protected structure crosses or comes into close proximity to other metal
structures that are unprotected or protected by its own electrically
isolated cathodic protection system(s)].
3.1.5
Test Stations [and Permanent Reference Electrodes]
Provide test stations [and permanent reference electrodes] [as indicated.]
as follows:
a.
At [305] [_____] meters [1000] [_____] foot intervals.
b.
At all insulating joints.
c.
At both ends of casings.
d.
Where the pipe crosses any other metal pipes.
e.
Where the pipe connects to an existing piping system.
f.
Where the pipe connects to a dissimilar metal pipe.
Do not fill the bottom of the test station with concrete unless otherwise
specified. Do not place rubbish, scrap or other debris into the test
station.
3.1.5.1
Permanent Reference Electrode Calibration and Installation
Provide [prepackaged] [copper copper-sulfate] [silver-silver chloride]
[zinc] reference electrode(s) as inidcated in the drawings. Prior to
installation, soak the [prepackaged] reference electrode in a container of
potable water for 30 minutes. Do not use seawater [except for
silver-silver chloride electrodes intended for use in seawater]. Calibrate
the permanent reference electrode in the presence of the contracting
officer or his approved representative by measuring the potential
difference between the permanent reference electrode and an independent
(portable) calibrated reference electrode placed in the water adjacent to
the permanent reference electrode. [Potential differences between the two
electrodes of the same generic type should not exceed [10] [15] millivolts
SECTION 13110N
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