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N40469 Chapter 5
Page 33
How to check the condition of the heat
exchanger
The interval for the maintenance of the tube type heat
exchanger (figure 13 item 1) depends on the operating
environment of the vessel and on the operating time.
The sea water that is circulated through the heat
exchanger and the amount of operating time of the
vessel affects the following items:
• Cleanliness of the tubes for the heat exchanger
• Effectiveness of the heat exchanger system
Operating in water that contains silt, sediment, salt,
algae, etc will adversely affect the heat exchanger
system. In addition, intermittent use of the vessel will
adversely affect the heat exchanger system.
The following items indicate that the heat exchanger
may require cleaning:
• Increased coolant temperature
• Engine overheating
• Excessive pressure drop between the water inlet
and the water outlet
An operator that is familiar with the normal operating
temperature of the coolant can determine when
the coolant temperature is out of the normal range.
Inspection and maintenance of the heat exchanger
are required if the engine is overheating.
Cleaning the Heat Exchanger
1. Drain the fresh water and auxiliary water circuits.
2. Undo the hose clips (figure 14 item 1).
3. Remove bolts (figure 14 item 2).
4. Remove the heat exchanger.
5. Remove the endcap by undoing the bolts (figure
15 item 1).
6. Turn the heat exchanger core upside-down in
order to remove debris.
Note:
Do not use a high concentration of caustic
cleaner to clean the core. A high concentration of
caustic cleaner can attack the internal metals of the
core and cause leakage. Only use the recommended
concentration of cleaner.
Figure 13
Figure 14
Figure 15