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FIG 9.4 TYPICAL HEAT EXCHANGER INSTALLATION FIG 9.5 HEAT EXCHANGER COOLING SYSTEM
9.5 Antifreeze Protection
If the engine is to be exposed to low temperatures,
the cooling water in the engine must be protected
from freezing. In radiator-cooled installations,
antifreeze may be added to the water to prevent
freezing. Ethylene glycol permanent antifreeze is
recommended for diesel engines. It includes its
own corrosion inhibitor, which eventually may have
to be replenished. Only a non-chromate inhibitor
should be used with ethylene glycol.
The proportion of ethylene glycol required is
dictated primarily by the need for protection against
freezing in the lowest ambient air temperature that
will be encountered. The concentration of ethylene
glycol must be at least 30% to afford adequate
corrosion protection. The concentration must not
exceed 67% to maintain adequate heat transfer
capability.
For heat exchanger cooling, antifreeze does only
half the job since it can only be used in the engine
water side of the heat exchanger. There must be
assurance that the raw water source will not freeze.
9.6 Water Conditioning
Soft water should always be used in the engine
whether cooling is by radiator or by heat exchanger
Adding a commercial softener is the easiest and
most economical method of water softening. Your
FG Wilson Distributor can recommend suitable
softeners. Manufacturers instructions should be
carefully followed.
10. FUEL SUPPLY
A dependable fuel supply system must assure
instant availability of fuel to facilitate starting and
to keep the engine operating. This requires, at a
minimum, a small day tank (usually incorporated
into the generating set baseframe - called a
basetank) located close to the set. With generally
only a capacity of 8 hours operation, this day tank
is often backed up by an auxiliary remote fuel
system including a bulk storage tank and the
associated pumps and plumbing. Extended
capacity basetanks are also generally available for
longer operation prior to refuelling. Especially for
standby generating sets it not advisable to depend
on regular delivery of fuel. The emergency that
requires use of the standby set may also interrupt
the delivery of fuel.
10.1 Fuel Tank Location
The day tank should be located as close to the
generating set as possible. Normally it is safe to
store diesel fuel in the same room with the
generating set because there is less danger of fire or
fumes with diesel than with petrol (gasoline). Thus,
if building codes and fire regulations permit, the day
tank should be located in the base of the generating
set, along side the set, or in an adjacent room.
Where an remote fuel system is to be installed with
a bulk storage tank, the bulk tank may be located
outside the building where it will be convenient for
refilling, cleaning and inspection. It should not,
however, be exposed to freezing weather because
fuel flow will be restricted as viscosity increases
with cold temperature. The tank may be located
either above or below ground level.
AUXILIARY PUMP
HEAT
EXCHANGER