wire brushing to produce a clean, bright surface. [Weld connections using
the exothermic weld kits in accordance with the kit manufacturer's
instructions.]
Test the integrity of the weld, prior to coating, by
striking with a 908 gram two pound hammer. Cover connections and exposed
structures with an electrically insulating coating, compatible with
existing coating.
3.1.2.1
Safety Precautions Around Fuel Facilities
Contractor shall take proper safety precautions prior to and during welding
to live fuel pipelines [tanks]. Contractor shall notify the activity Fuel
Office via the Contracting Officer a minimum of three days before
performing exothermic welding to live fuel lines. Exothermic welding shall
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 of150 mm 6 inches apart. In the
event of an unsuccessful 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
Rectifiers
Location and mounting as indicated. Assemble and attach equipment
enclosures to [wall] [post] [pad] in accordance with the manufacturer's
instructions. Handle wires to prevent stretching or kinking the conductors
or damaging the insulation. Use lubricants when pulling wires into
conduits. Bond the equipment enclosures to a grounding electrode.
3.1.4
Test Stations [and Permanent Reference Electrodes]
Locate test stations [and permanent reference electrodes] [as indicated.]
as follows:
a.
At [305] [_____] meters [1000] [_____] foot intervals.
b.
At 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 old piping system not under
cathodic protection.
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.
SECTION 13111N
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