Abstract:
The freshwater cooling system is a vital component supporting the performance of the
main engine on board. One of the key components in this system is the Low
Temperature (LT) Cooler, which functions as a heat exchanger between freshwater and
seawater. Based on observations aboard MT. Royal Crystal 7, blockages were found on
the LT cooler plates as well as gasket damage, resulting in reduced cooling efficiency
and freshwater temperatures exceeding normal limits. These issues are generally
triggered by a lack of regular maintenance and ineffective cleaning methods. This study
aims to identify the problems occurring in the LT cooler and evaluate appropriate
maintenance solutions to keep the cooling system performing optimally. The research
uses a descriptive approach through direct observation, documentation, literature study,
and analysis using the fishbone method to determine the root causes. Two cleaning
methods evaluated are backwash cleaning and manual cleaning. The results show that
backwash cleaning is less effective in removing thick scale, making manual cleaning
the most effective solution as it allows thorough cleaning and visual inspection of the
plates and gaskets. With scheduled maintenance according to the Planned Maintenance
System (PMS), cooling system efficiency can be improved and the risk of main engine
damage due to overheating can be minimized.
