openness of the design. The shell and tube heat
exchanger requires an expansion tank to remove air
from the system. The raw water supply system should
be closely coordinated when applying a shell and
tube heat exchanger.
Cooling towers have limiting working ranges and can
be applied successfully only in certain climates.
The submerged pipe cooling system requires a large
quantity of raw water and an expansion tank.
Factors for consideration when evaluating cooling
systems include engine size, space limitations,
acceptable noise levels, raw water supply,
maintenance, operational requirements, and system
operating costs. Engine suppliers should be
contacted for assistance in selecting the
appropriate cooling system for the application.
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Each engine shall have its own cooling system. The system shall be of the
closed type and operate automatically while the engine is running.
The cooling system shall have an engine-driven water pump, [fin-tube
radiator], [cooling tower], [remotely mounted fin-tube radiator],
[shell-tube heat exchanger, expansion tank], [plate and frame heat
exchanger, expansion tank], [submerged pipe, expansion tank], and an
automatic temperature regulating valve. The maximum temperature rise of
the coolant across each engine shall not exceed the engine manufacturer's
recommendation as submitted in paragraph SUBMITTALS.
The engine cooling system shall be of the closed type arranged to prevent
rust and minimize formation of scale deposits within the engine. The
system shall circulate jacket-coolant through the engine at the temperature
and flow rate recommended by the engine manufacturer. The coolant shall be
an ethylene-glycol water mixture with a concentration sufficient for freeze
protection at the minimum outdoor temperature specified. The maximum
temperature rise of the coolant shall be no more than that recommended and
submitted in paragraph SUBMITTALS.
2.5.1
Coolant Pumps
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NOTE: Delete raw-water pump option for closed-loop
systems.
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Engine-driven jacket water pumps shall be of the centrifugal type.[
Raw-water centrifugal circulating pumps shall be [electric motor driven
equipped with manual-off-automatic controllers] [engine driven].] Each
engine shall have an engine-driven primary pump. Secondary pumps shall be
electric motor driven and have automatic controllers. The pump shall be a
bronze fitted, single stage type with removable seal rings and stuffing box
and properly sized for the intended purpose.
2.5.2
[Radiator
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NOTE: Radiator location and mounting details should
SECTION 15133A
Page 24
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