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Installation and Maintenance Manual form 185
1.0
PLANNING & LOCATION
To function properly, the FERNSTRUM® GRIDCOOLER® Keel
Cooler must be properly located on your vessel’s hull. Please
consider the following before installing your keel cooler on
most types of vessels. For additional details on displacement
or planing hulls, refer to the appropriate sections.
1.1
DETERMINING PROPER LOCATION –
TYPICAL
1.1.1
Sea water must flow over the entire length of the
unit.
1.1.2
Always install the unit parallel, not transverse, to the
skeg or keel. See Figures 1 & 2.
FIG.1
External type installation with E1 OPTION
end-mounted anodes using fairing blocks for
protection and streamlining.
FIG.2 Recess type installation with E1 OPTION end-
mounted anodes.
1.1.3
When using a two-circuit cooling system, consisting
of a high temperature jacketwater circuit and a low
temperature aftercooler circuit, make certain the
aftercooler circuit cooler is placed forward of the
jacketwater circuit cooler. When room allows, they
can be installed side by side with the aftercooler
circuit lower on the hull (i.e. closer to the skeg or
keel) and a divider plate between the high and low
temperature units.
1.1.4
When the GRIDCOOLER unit is used on a generator
set or if your application requires sizing for a hull
speed of 0 knots, make sure that sea water can
freely circulate past the cooler tubes. Do not recess
a generator set unit on the bottom of a flat bottom
boat unless the hull section where the unit will be
mounted inclines a minimum of 20 degrees (from
forward to aft) to avoid entrapment of heated water
around the tubes. See Figure 3.
1.2
DETERMINING PROPER LOCATION –
DISPLACEMENT VESSELS
1.2.1
On vessels performing pushing, towing, dragging
or pulling operations, the unit may be installed near
the propeller, but not directly above it. See Figure 3.
Install the unit to avoid the full impact of the propeller
wash as this could cause damage to the unit.
FIG.3 Recessed installation is made by welding in
a box-shaped recess in the hull. Note aft end
of recess is tapered to prevent hot water
entrapment.
1.2.2
When installing a unit on the side of a hull, position
it well below the water line to avoid aerated surface
water. Take the bow wave into consideration. Aeration
reduces heat transfer and can cause overheating.
