Abstract:
This research aims to analyze the causes of decreased performance of the main air
compressor on board MV. Lumoso Alam, as observed during sea practice. The main
compressor, Tanabe H-64, with a maximum pressure of 25 bar and a capacity of 130 m³/h,
encountered issues such as the mixing of lubricating oil with water and prolonged air
charging time into the air bottle. These problems significantly affected the lubrication
process and overall system efficiency. The research method applied was descriptive
qualitative, involving direct observation, and technical documentation. It was found that
a leak in the intercooler allowed cooling water to enter the lubrication chamber, resulting
in foamy, milky-colored oil. This condition lowered the maximum air pressure from 30
bar to only 18 bar. Additionally, the air charging time, which should normally take ±10
minutes, increased to over ±30 minutes, delaying the ship's departure. Other contributing
factors include clogged air filters, air line leaks, and worn piston rings. Solutions
implemented included intercooler replacement, filter cleaning, air line inspection, and
piston ring renewal. This study recommends regular maintenance, visual system checks,
and crew training to detect early signs of compressor failure. The findings are expected
to serve as practical references for cadets and ship engineers in addressing similar issues
and maintaining optimal ship operation.
