To avoid breakdowns in the main air compressor, the following maintenance must be considered.The planned maintenance system devised by the company must be strictly followed else there can be a severe breakdown.Maintenance jobs carried out on the main air compressor depending on the running hours of the compressor and all these jobs are mentioned in the maintenance manual of the compressor. The compressor is generally started in an unloaded condition so that minimum current is drawn by the motor and the bearings are devoid of oil. Related Reading: Efficiency Of Air Compressor The performance report includes the delivery air temperature, cooling water inlet and outlet temperatures, lube oil pressure and discharge pressures of each stage of the compressor. Performance of the marine air compressor is taken at the end of every month to ascertain the working capacity of the compressor. The delivery side is fitted with a high-temperature switch which cuts off the compressor at a specified temperature or a fusible plug which may melt at 121 degrees centigrade. The air compressors are fitted with several safety devices as well such as relief valves on each stage which limit the pressure rise to 10% of the maximum working pressure. Usually, air compressors onboard are capable enough to charge both the air receivers from zero to full in one hour. Related Reading: Basics of air compressor on shipĪlso, the outlet of the relief valves should be outside the engine room so that it doesn’t contribute in case there is a fire near the air receiver. This capacity is limited to 6 times if it’s a unidirectional engine.Įach of the air receivers is fitted with a relief valve, which will limit the pressure rise to 10% of the maximum design pressure of the receiver. The two compressors fill up the air receivers, which should have total capacity such that the engine can start 12 times ahead and astern without replenishment of the receivers. Generally, there are two compressors onboard a ship ( can be more than two depending upon the requirement of the vessel.) Marine air compressors are used to start large slow speed and medium-speed marine diesel engines, and therefore are an integral part of engine room on-board.
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