- Change the switch to manual position on the switch board.
- Check the L.O sump level and condition
- Open the moisture drain valve.
- Open the compressor discharge valve & charging valve of air bottle.
- Open cooling water system valves.
- Turn the compressor flywheel by hand (one turn).
- Start the motor, after draining the moisture shut the drain valve.
- Check the motor ampere consumed.
- Check the pressure gauge readings.
- Frequently drain the moisture.
- When charging full, open drain valve and stop the compressor
1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers. 2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio. 3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence. 4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials. 5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries. 6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult. Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their: - High strength and durability - Excellent corrosion resistance - Good cavitation resistance - Ease of casting and machining - Weldability
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