Installation Procedure
A) Preparation
- Unwind and cut 1000 feet coil into desired lengths. Each strip
should be as long as the length of a tank, but not more than 100 feet
- Expose about 4 inches of core wire at each end of the strip, by
carefully cutting away magnesium element with bolt cutters, or by
splitting-off magnesium element with a sledge hammer. In either
case, the core wire should be fully intact, and capable of being
bent into the hole in the clamp.
B) Layout
- The amount of Electroline should be determined ahead of time,
by using a ratio of 1 linear foot of ribbon per 7 sq. ft. of
surface area.
- The layout of the ribbon in any upper wing, lower wing, or
double-bottom tank of a bulk carrier is uncomplicated. All strips
should run longitudinally from one watertight bulkhead to another,
evenly spaced across the bottom and sides. It is not necessary to
fit a ribbon on the deckhead of a tank that has a depth of less
then 20 feet.
- This same procedure can be used on the bottom of a wing or
center tank of a product carrier. If the crew can work from
ladders or stringers, the ribbon can be fitted in the same manner
on the side shell and longitudinal bulkheads. If the tank is wider
than 20 feet, strips should be fitted on the deckhead by
suspending from forward to aft Butterworth openings.
- If the bulkheads are inaccessible for whatever reason, the
ribbons should be hung from all of the deck openings to the tank
bottom, as close to the bulkheads as possible. Uniform
distribution is somewhat compromised when this method is employed,
thus we recommend against it unless absolutely necessary.
C) Clamping
- A chipping hammer and a box wrench are the only tools
required for clamping.
- Once the strip is laid-out in its desired position, simply
clean away the dirt, paint, or rust on any flange. Secure the
c-clamp to the stiffener, making certain the core wire is wedged
between the steel and the clamp.
- Small pieces of rope may be necessary to secure the
Electroline in certain locations, especially in upper levels.
D) Ballasting
- After all the strips are uniformly distributed and
secured, the tank should be filled with pure saltwater ballast
for 7 continuous days.
- If possible, top-off or press the tank full, as the
deckhead will descale as long as it is immersed. Swashing
should be kept to a minimum.
- In very large tanks where much scale is expected to fall,
it is advantageous to ballast only the bottom level for about
3 days, so that the volume of upper level scale does not cover
and thus insulate the bottom from being descaled. The upper
level will still require 7 days, for a total of 10 days.
E) Cleaning
- After minimum 7 days' ballast, the steel core wires and
clamps should be discarded with the scale.
- The bulkheads should be high-pressure hosed to detach
any scale that may be lodged in crevices or corners, or
resting on flat surfaces.
- Also, hosing will remove calcareous deposits in
preparation for soft coating.
Next: Surface Preparation Results
Previous: Safety Precautions
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