- Validity of the IOPP certificate checked.
- Proper entry of ORB and, sludge disposal receipts to shore facilities attached to ORB.
- Calculate the sludge formation, and compared with 1% of voyage fuel consumption.
- Incinerating time, incinerated waste oil amount, remainder of waste oil in waste oil tank should be reasonable.
- Incinerator kept ready for demonstration, such as heating of waste oil tank, alarms, control and functional test, done priorto survey.
- OWS in good order, it’s piping free from oil leaks, overboard valve from OWS locked in closed position. If possible, one
- section of discharge pipe removed and free from oil residues.
- ODM checked for 15-ppm alarm and automatic stopping.
- High-level alarms of sludge tank, waste oil tank and bilge holding tank checked.
- Spare filter for OWS must be kept onboard.
- USCG Notice posted near OWS and bilge pumping out station.
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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