- Inform bridge and take controls to ECR.
- Raise engineers alarm and inform C/E
- Start Aux engine which is in standby.
- Record time of failure / Maintain timings of events.
- Assess the situation and if the repair / restarts need considerable time then prepare for anchorage if depth permits.
- Ascertain cause of failure.
- Ascertain if Shore assistance is required.
- Ascertain time required to repair start repair and inform bridge of the progress and expected time of completion.
- Inform company’s technical department.
- After rectifying the fault, start M/E and try out in ahead and astern direction
- Make a report of the failure and damage.
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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